Page 1 of 2 1 2 >
You need to be logged in to post
Options
Index
#449959 - 01/08/18 02:11 PM [Help! Tech S.O.S (Off topic)] Amp power: 2 prong to 3 prong
Registered: 06/15/00
Posts: 2185
Loc: Sacramento CA
flatfoot Offline
Veteran

Registered: 06/15/00
Posts: 2185
Loc: Sacramento CA
.
I am hoping for someone with bench experience to help me with this.

I am the original owner of a Gibson GA75. Great amp. Just dusting it off after more than 30 years idle, and it seems to work, mostly.

One thing i want to upgrade right away is the power cord. I feel competent to do this, but not competent to judge whether the 'death capacitor' has to be removed. From the schematic it looks like a simple matter of grounding the 3d wire to the chassis.

Have I got that right? Do I leave the 'death cap' in place? Is this even a good idea?


Attachments
plug.JPG




Edited by flatfoot (01/08/18 02:12 PM)
_________________________
Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
.
My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab

Top
#450010 - 01/08/18 08:52 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Larry Kehl Online   content
Veteran

Registered: 06/04/00
Posts: 2134
Loc: New Mexico
This is NOT ADVICE. I would NEVER tell you how to do line voltage (power mains) mods - if you are a EE, a certified tech, or have been doing amp mods, building radios, radars, etc., most of your life you'd NOT be asking in the first place and I don't want the liability.

HOWEVER if it were ME and I was (re)doing this on my '62 GA-19RVT

REMOVE THE CAP completely (removes any possibility of accidental shorts, arcs, or any dumba$$ery by user) - don't get lazy thinking you can "lift a leg" or wire around it.

AND make sure my NEW GREEN wire (ground) is NOT just soldered on somewhere but is solidly and physically connected to chassis through existing chassis hole (or a new one) using an eye-let - staked/connected with nut and bolt/screw also using both a lock washer and an internal (or external) star washer both on nut side (helps keep nut from working loose due to vibrations) e.g.,

https://www.mscdirect.com/browse/tn/Fasteners/Washers-Shims/Lock-Washers/Internal-External-Tooth-Lock-Washers?navid=12108820

nut -> star washer -> lock washer -> chassis -> bolt(screw)-head


Is that overkill? not really - you won't be the one KILLED

Larry

I would also ensure and DOUBLE CHECK that the black (aka HOT) wire is FIRST to FUSE (as shown) then to switch; that way if fuse blows this keeps ANY voltage out of amp "side."



Edited by Larry Kehl (01/08/18 08:53 PM)
_________________________
Win10Pro64,i78086K,32GB,2TBSSD+20TB HDDs,1080TI,Scarlett18i8,MIDI4x4,Montage7,Fusion 8HD,QS8,GR-50,Integra7,XV5080,Fantom-XR,QSR,SC-8850,SPLAT,FL20, SO3,MC8,AD2,ST3,Kontakt5,Amptube4,etc.. but I'm really a guitar player;AXE FX III+++

Top
#450015 - 01/08/18 10:10 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: Larry Kehl]
Registered: 06/15/00
Posts: 2185
Loc: Sacramento CA
flatfoot Offline
Veteran

Registered: 06/15/00
Posts: 2185
Loc: Sacramento CA
.
Hi Larry - and thanks. You are reinforcing my paranoia, which is probably a good thing. Better to pay somebody and not take a chance.

So... is it a good idea? Should I go to 3-prong or leave it as it is?
_________________________
Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
.
My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab

Top
#450031 - 01/09/18 03:39 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 11/19/17
Posts: 34
Loc: uk
duncanwhyte Offline
Enthusiast

Registered: 11/19/17
Posts: 34
Loc: uk
With the first turn of the switch the capacitor doesn't actually connect. But it does if you turn it some more. So you have the option.

In an ac circuit a capacitor allows frequencies to pass but can greatly reduce others. So its main purpose was to reduce the mains humming at 60hz. (The tuner of an analog radio is basically a range of adjustable capacitors).

There were many badly designed and built amps and radios in the early days of sound engineering. It meant that they became live if the input polarity was changed. Easily done if you plugged in the mains the wrong way round. Added to that the venue might well have faulty wiring, causing reversed polarity and a poor earth. Typically an old church or such.

The so called death capacitor picked up a bad name because in some cases it failed and caused a short circuit in an already bad circuit (or one of reversed polarity) which lead to shocks and death. But it was never intended to be there as a safety device, its purpose was to reduce noise.

So the Gibbo amp may need a new capacitor to function as best as it was intended. For the purposes of authentic sound and that elusive feel. But probably best left to a professional to make that decision.

Older model amps can be converted to safer electrical connections. But this might mean changing quite a lot more in the power supply stage.
_________________________
Using: Dell 3268 i3, 8 GB ram, windows 10. Biab version 2017 standard package, no extras.

Top
#450062 - 01/09/18 07:19 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 12/27/03
Posts: 11533
Loc: Hamlin NY
MarioD Offline
Veteran

Registered: 12/27/03
Posts: 11533
Loc: Hamlin NY
Originally Posted By: flatfoot
.
Hi Larry - and thanks. You are reinforcing my paranoia, which is probably a good thing. Better to pay somebody and not take a chance.

So... is it a good idea? Should I go to 3-prong or leave it as it is?


Take it to a pro and have him change it to a three prong. If something goes wrong it is his/her responsibility to repair it. He/she would also guaranty their work.

I remember the old days when you have to grab your guitar strings then quickly touch the mic to make sure you wouldn't get shocked or killed if you grabbed the mic while holding the guitar. Thanx God for three prong plugs.
_________________________
Politicians, like diapers, occasionally need to be changed. Usually for the same reason!

64 bit Win 10 Pro - the latest BiaB and RB - Roland Octa-Capture audio interface - a ton of software and some hardware.

Top
#450083 - 01/09/18 08:50 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: MarioD]
Registered: 12/27/13
Posts: 1320
Loc: St. Louis, MO. USA
sslechta Offline
Expert

Registered: 12/27/13
Posts: 1320
Loc: St. Louis, MO. USA
Originally Posted By: MarioD
I remember the old days when you have to grab your guitar strings then quickly touch the mic to make sure you wouldn't get shocked or killed if you grabbed the mic while holding the guitar.


That made me laugh from an incident a band I was in had years ago..... The two guitarists in the band touched their guitars together during a show. Little did they know they were each plugged into an outlet that was reverse wired from the other. ****SPARKS**** everywhere. No one was hurt luckily. Although some strings were killed.
_________________________


Steve

BIAB/RB 2018, Pro Tools 2018, Korg N5, Proteus F/X, JBL LSR 4328 Powered Monitors, AKG/Shure Mics.
PC: 1 TB SSD, 2 TB HD, 128 GB Memory

Top
#450181 - 01/09/18 03:20 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: sslechta]
Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Larry Kehl Online   content
Veteran

Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Do what you want but my recommended bottom line:

If it’s an older AMP (one like yours) and it has 2 prong plug THEN CHANGE IT TO 3 PRONG!

YOU WILL NOT HURT VALUE! If paranoid KEEP old cord, the OLD cap (and make notes on where and how it was connected) and don’t drill any new holes in chassis or make any other UN-reversible or cosmetic changes – it can be restored to original configuration in about 30 minutes (and that includes a coffee break while soldering iron heats up).

I think you already know this but that particular cap has ZERO impact on audio path – so removing it has no, zip, zero, nada, nein, audible impact. It CANNOT affect audio because it is NOT in signal path.



MarioD has best suggestion (I should have stressed this last night):

TAKE IT TO A PRO. They can make it SAFE and in a way that allows it to be completely reversible (but I doubt that will ever be an issue or even come up if you try to sell it later).

The plus side of taking it to a Pro they can evaluate and, if it has not been done in last 30+ years, its probably also time for a re-cap job anyway.

Good Luck
Larry
_________________________
Win10Pro64,i78086K,32GB,2TBSSD+20TB HDDs,1080TI,Scarlett18i8,MIDI4x4,Montage7,Fusion 8HD,QS8,GR-50,Integra7,XV5080,Fantom-XR,QSR,SC-8850,SPLAT,FL20, SO3,MC8,AD2,ST3,Kontakt5,Amptube4,etc.. but I'm really a guitar player;AXE FX III+++

Top
#450392 - 01/10/18 04:47 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 06/05/12
Posts: 8482
Loc: Melbourne, Australia
VideoTrack Online   content
Veteran

Registered: 06/05/12
Posts: 8482
Loc: Melbourne, Australia
At 0.022ufd it's a very small value. I wouldn't call it a 'death' cap, but don't remove it, it's there as a filter for a very good reason.

Get a tech to fix the plug, and ask them to install a bleed resistor across the cap while they're at it.

In future the capacitor will discharge once power is removed, and you'll stay safe.
_________________________

BIAB, RB 2018(Audiophile), Sonar Platinum, Izotope Prod. Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, KorgX3R, RodeNGT2, AM802mixer, NS40M Studio Monitors, Pioneer Active Mons, AKG K271 Studio H'phones

Top
#450462 - 01/11/18 05:42 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: VideoTrack]
Registered: 11/30/07
Posts: 1823
Loc: Ontario, Canada
BlueAttitude Offline
Expert

Registered: 11/30/07
Posts: 1823
Loc: Ontario, Canada
Originally Posted By: VideoTrack
At 0.022ufd it's a very small value. I wouldn't call it a 'death' cap, but don't remove it, it's there as a filter for a very good reason.


The reason they call it a death cap is because if it shorts out it results in the amp chassis and your guitar being directly connected to the mains.

Here: https://music.stackexchange.com/questions/2164/what-is-a-death-cap
_________________________
Dave

Blue Attitude: Homepage, Youtube page

Top
#450490 - 01/11/18 09:02 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 11/19/17
Posts: 34
Loc: uk
duncanwhyte Offline
Enthusiast

Registered: 11/19/17
Posts: 34
Loc: uk
This circuit has three possible conditions. Where the cap is unconnected, or switchable to either live or common wires in the event that incorrect polarity is applied to power the amp. So logic dictates that if the cap can be switched out it was never intended as a safety device.

Some famous products simply connected the circuitry directly to the mains and caused many a shock and death. But the Gibson has incorporated wiser circuitry.

The first point at which safety is introduced is with the fuse, which will blow if it senses current beyond its designed use. This will work in both polarities.

The ac works at 60hz, a resonant frequency that can become a dominant sound in the amplifier. So the cap helped reduce its presence. Canny engineering can achieve a marked improvement.

Also the cap is not a stand alone thing. The cap and the transformer form a circuit. Its ability to filter is integral to the value of the coil in the transformer, which is acting as an inductor. So it is an LC filter.

It would need a lot more maths and physics to understand more about it, and I didn't achieve the headpiece for that.

But if its a fundamental thing to the balance of the whole system, it would need to be retained.
_________________________
Using: Dell 3268 i3, 8 GB ram, windows 10. Biab version 2017 standard package, no extras.

Top
#450491 - 01/11/18 09:12 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 04/03/09
Posts: 5928
Guitarhacker Offline
Veteran

Registered: 04/03/09
Posts: 5928
I'd do it.

Be sure you have the hot and neutral in the right place..the hot side should be going to the fuse......and then connect the ground with a crimp style ring connector to the chassis.

If the so called "death cap" ever shorts, the ground should prevent dangerous voltages where they shouldn't be. It will cause the fuse to blow on a chassis short.
_________________________
You can find my music at:
www.herbhartley.com

Add nothing that adds nothing to the music

Top
#450494 - 01/11/18 10:00 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 11/30/07
Posts: 1823
Loc: Ontario, Canada
BlueAttitude Offline
Expert

Registered: 11/30/07
Posts: 1823
Loc: Ontario, Canada
If you wanted to keep the cap one thing you could do is replace that .022 cap with two .047 caps connected in series.

That would give you a similar capacitance value, and the chances of two capacitors shorting out is very slim indeed.
_________________________
Dave

Blue Attitude: Homepage, Youtube page

Top
#450502 - 01/11/18 11:52 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: BlueAttitude]
Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Larry Kehl Online   content
Veteran

Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Originally Posted By: BlueAttitude
...

The reason they call it a death cap is because if it shorts out it results in the amp chassis and your guitar being directly connected to the mains.
...


BlueAttitude has it EXACTLY right!!! AGAIN TAKE IT TO A PRO


BTW: ANY Pro who would mod this amp from a 2 prong to 3 prong will REMOVE it (at least electrically remove it - I prefer physically removing it, it's not needed get it out)

Your amps polarity reversal switch (whatever label calls it as I can't quite find a clear GA-75 panel pic for this "newer" version GA-75 - the OLDER GA-75 only had an ON-OFF switch) will no longer do anything (but yes they can do mod and keep/use the original switch)

Larry
_________________________
Win10Pro64,i78086K,32GB,2TBSSD+20TB HDDs,1080TI,Scarlett18i8,MIDI4x4,Montage7,Fusion 8HD,QS8,GR-50,Integra7,XV5080,Fantom-XR,QSR,SC-8850,SPLAT,FL20, SO3,MC8,AD2,ST3,Kontakt5,Amptube4,etc.. but I'm really a guitar player;AXE FX III+++

Top
#450513 - 01/11/18 12:45 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 11/19/17
Posts: 34
Loc: uk
duncanwhyte Offline
Enthusiast

Registered: 11/19/17
Posts: 34
Loc: uk
Okay I have read through some theory again. The power supply to the transformer is in fact a tunable parallel rlc circuit (resistor, inductor and capacitor). the capacitor we know about. The inductor is the coil in the transformer and there is a resistor in the neon bulb.

The combination of these in an ac circuit will have a complex performance but they can be selected to produce a bandwidth of frequencies. If the frequency to be desired is set at say 16hz that would not have been achievable in that era of amplification and would not be reproduced suitably loud enough. Thereby reducing the noisy 60hz.

A crude but reasonably effective solution, where HiFi isn't required.
_________________________
Using: Dell 3268 i3, 8 GB ram, windows 10. Biab version 2017 standard package, no extras.

Top
#451029 - 01/14/18 02:59 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: BlueAttitude]
Registered: 06/05/12
Posts: 8482
Loc: Melbourne, Australia
VideoTrack Online   content
Veteran

Registered: 06/05/12
Posts: 8482
Loc: Melbourne, Australia
Yes, I see.
Point well explained Dave.
Also, while I don't know the inductance of the transformer primary, I calculate the capacitive reactance at 60Hz at something approximating 120k ohm (120,571 ohms). With the amp in a completely un-grounded situation, I imagine to be able to feel something if I was grounded and touched the amp chassis itself while it was switched on.

Better to get that 3 pin connection happening.
_________________________

BIAB, RB 2018(Audiophile), Sonar Platinum, Izotope Prod. Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, KorgX3R, RodeNGT2, AM802mixer, NS40M Studio Monitors, Pioneer Active Mons, AKG K271 Studio H'phones

Top
#451032 - 01/14/18 03:36 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: VideoTrack]
Registered: 12/20/16
Posts: 330
Loc: Gold Coast, Queensland, Austra...
Teunis Offline
Journeyman

Registered: 12/20/16
Posts: 330
Loc: Gold Coast, Queensland, Austra...
I see a lot of advice to take it to a pro which is certainly advice I would heed. Steve wrote about an incident where two guys on stage touched guitars and sparks flew. This tells me it is important that all the gear goes back to one common point. This is particularly true of earth or ground points. Some usually older buildings may have electrical circuits going back to different earths this can create issues such as earth loops, tingling and/or sparks and also increased buzz or we would say 50 cycle hum. For you 60 cycle hum.

Just a thought

Tony
_________________________
HP i7-4770 16GB 512G SSD, Win 10 Home,
Roland Quad Capture, Launchkey 61, Maton CW80, Telecaster + more
BIAB 2018 (520) RB 2018 (5), CakeWalk by BandLab, Reaper, Audacity, Melodyne

Top
#451180 - 01/14/18 06:23 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: Teunis]
Registered: 06/15/00
Posts: 2185
Loc: Sacramento CA
flatfoot Offline
Veteran

Registered: 06/15/00
Posts: 2185
Loc: Sacramento CA

~Wow!~

Thanks for all these great replies!

A few days ago, I remembered that I have a local friend who is my age, plus. I found out he made a living working on tube circuits before moving on to computers in the 80s. He says the thing to do is test and replace all the capacitors. Upgrading to 3-prong is a no-brainer when doing a caps job.

It will be fun, since he will talk to me while he works. I am sure to learn some important stuff.

Thanks for all your help.
_________________________
Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
.
My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab

Top
#451286 - 01/15/18 10:42 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 04/03/09
Posts: 5928
Guitarhacker Offline
Veteran

Registered: 04/03/09
Posts: 5928
I love the smell of rosin core solder in the morning.
_________________________
You can find my music at:
www.herbhartley.com

Add nothing that adds nothing to the music

Top
#451434 - 01/16/18 02:37 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 06/05/12
Posts: 8482
Loc: Melbourne, Australia
VideoTrack Online   content
Veteran

Registered: 06/05/12
Posts: 8482
Loc: Melbourne, Australia
Quote:
He says the thing to do is test and replace all the capacitors.

Yes, that nailed it. Let him replace the required capacitors. Their values drift with age, more than any other components.

Your mate will do you a big favor to get that amp humming again. Oh my, what did I just say? crazy
_________________________

BIAB, RB 2018(Audiophile), Sonar Platinum, Izotope Prod. Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, KorgX3R, RodeNGT2, AM802mixer, NS40M Studio Monitors, Pioneer Active Mons, AKG K271 Studio H'phones

Top
#452304 - 01/19/18 07:29 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: Teunis]
Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Larry Kehl Online   content
Veteran

Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Not to beat this horse to death ("the horse is never so dead it can't be beat some more") since you are taking it to a pro but consider this a "Oh by the way:"

Here is another Gibson amp and note this vid was posted AFTER we discussed what to do with a “death cap”

https://www.youtube.com/watch?v=TeWF6nHSH08

Go to about 8:37 and he talks about changing it to a three prong and the “death cap” – he doesn’t SAY he will remove the cap BUT you can see it there BEFORE he mods and it’s GONE after he mods.

You can plainly see it in circuit on the left (big black one) connected to ground next to transformer (go to around 8:57) and goes to power switch and by time 10:23 it has been REMOVED completely.

Larry

PS I had a Gibson GA-5 (I was first original owner, along with a original first owner of a ES-125) the model that preceded the Crestlines. They were physically smaller and covered in an almost white tolex I TRULY MISS that thing.




Edited by Larry Kehl (01/19/18 07:32 PM)
_________________________
Win10Pro64,i78086K,32GB,2TBSSD+20TB HDDs,1080TI,Scarlett18i8,MIDI4x4,Montage7,Fusion 8HD,QS8,GR-50,Integra7,XV5080,Fantom-XR,QSR,SC-8850,SPLAT,FL20, SO3,MC8,AD2,ST3,Kontakt5,Amptube4,etc.. but I'm really a guitar player;AXE FX III+++

Top
#452307 - 01/19/18 07:43 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 04/08/11
Posts: 4409
eddie1261 Online   content
Veteran

Registered: 04/08/11
Posts: 4409
Would they produce and amp that wasn't safe for you as it is?
_________________________
I will continue to post in the songwriters forum but will pretty much be keeping my opinions to myself as far as the off topic forum goes.

Top
#452351 - 01/20/18 03:59 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 11/19/17
Posts: 34
Loc: uk
duncanwhyte Offline
Enthusiast

Registered: 11/19/17
Posts: 34
Loc: uk
More study and its a basic early line filter. Intended to clean up the power supply. Something which now is done at the point of generation, but back then wasn't detected until sound equipment came into being.

Perhaps you might remember some amps which gave out a radio signal? Because they picked it up in their circuitry. Such things are rare as rocking horse doodoo now.

Its unlikely now to find a noisy line in the grid. But quite possible in something like a generator if the line filter on that is poor or faulty.
_________________________
Using: Dell 3268 i3, 8 GB ram, windows 10. Biab version 2017 standard package, no extras.

Top
#452356 - 01/20/18 04:33 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: duncanwhyte]
Registered: 11/30/07
Posts: 1823
Loc: Ontario, Canada
BlueAttitude Offline
Expert

Registered: 11/30/07
Posts: 1823
Loc: Ontario, Canada
Originally Posted By: duncanwhyte
More study and its a basic early line filter. Intended to clean up the power supply. Something which now is done at the point of generation, but back then wasn't detected until sound equipment came into being.



I agree, no longer needed and you will never see it in a modern tube amplifier.
_________________________
Dave

Blue Attitude: Homepage, Youtube page

Top
#452480 - 01/20/18 02:45 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: eddie1261]
Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Larry Kehl Online   content
Veteran

Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Eddie

No reputable designer or company would do it KNOWINGLY but yes they did unwittingly make unsafe amps. And it was almost EVERY amp manufacturer of that era especially when based on 40'5 & 50's designs and before the general use of the "hot, neutral, and grounded" power cord (aka the 3 prong) - with a properly grounded amp folks no longer had to "lift ground" to reduce/eliminate 60 (50) cycle hum .

These early design's were simply done "in a vacuum,", that is they never considered a cascade of failures:

1) a shorted CAP and

2) touching STRINGS, while

3) TOUCHING an ACTUAL ground source or touching a "grounded" Mic or other guitar player whose OWN ground source was at a completely different electrical potential

But these designs were not done with malice and the designers were not not lazy or stupid.

Even today a clean and great sounding amp can probably trace their actual design (maybe even the entirety of it, except for some of the power supply) directly back to these OLDER designs, with very little if ANY modification to signal flow path, power supply rectification, or components.

Larry


Edited by Larry Kehl (01/20/18 02:46 PM)

Top
#457367 - 02/13/18 11:57 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Registered: 06/04/00
Posts: 2134
Loc: New Mexico
Larry Kehl Online   content
Veteran

Registered: 06/04/00
Posts: 2134
Loc: New Mexico
how did your mod go?

and while here

This is just an UPDATE (and more "dead horse beating") with a video on HOW to do it (while this is a Fender not Gibson it has similar design with a death cap and ground/polarity switch)

https://www.youtube.com/watch?v=3cX-DwRWIMU

(on this first vid he leaves death cap in and polarity switch in but entire thing has been electrically removed from circuit - he does it for 1) external cosmetics - no gaping hole where switch was and 2) if some idiot wants to revert to original DANGEROUS condition)

and to add emphasis on how to

https://www.youtube.com/watch?v=LEyScfv1Mgc&t=141s

Larry


Edited by Larry Kehl (02/13/18 12:06 PM)
_________________________
Win10Pro64,i78086K,32GB,2TBSSD+20TB HDDs,1080TI,Scarlett18i8,MIDI4x4,Montage7,Fusion 8HD,QS8,GR-50,Integra7,XV5080,Fantom-XR,QSR,SC-8850,SPLAT,FL20, SO3,MC8,AD2,ST3,Kontakt5,Amptube4,etc.. but I'm really a guitar player;AXE FX III+++

Top
Page 1 of 2 1 2 >


Moderator:  Andrew - PG Music, PeterGannon 
PG Music News
With Band-in-a-Box®, Making Music Has Never Been Easier!


We came across this recent post, Music Making Software: Record, Edit, Create and Share Your Own Songs, which includes Band-in-a-Box® in their list of software you'll need to record and edit your own songs!

One of our favourite products, and one that doesn’t seem to come up much in discussions about music making software, is Band-In-A-Box from PG Music. This is probably the longest established and certainly one of the most popular music making software packages of all time. Already packed with features, the latest version has added functions that in our opinion make this an essential buy for musicians in any genre, for keyboard players, guitarists, singers, in fact any musician looking for an outstanding tool to make the most of their creative ideas.
-www.musicrepo.com

The Download Manager - Band-in-a-Box® for Windows

The "Download Manager" within Band-in-a-Box® for Windows is a great tool to confirm or help with the installation of your Band-in-a-Box® for Windows program!

What does the Download Manager do?
Automatically installs Band-in-a-Box® content (RealTracks, RealDrums, etc.) in the background, so you don't have to sit there the whole time! It can also confirm that you've completely installed your purchase.

How do you use it?
Within the program, go to Help | Utilities | Run Download/Install Manager now. Using your activation code, the program will analyze the installation folders, and list anything that still needs to be downloaded and installed.

Learn more about the Download Manager with this tutorial, or check out the topic within the Online Manual.

Band-in-a-Box® for Windows Online Manual - Chord List & Shortcuts

Visit the Chord List of our Online Manual, and you'll see all the chords that can be used within the program! The list includes a few Tricky Chords and Shortcut Chords that you may find useful too!

Tricky Chords:
C5b This is "C flat 5." It is spelled this way to avoid confusion.
C2, C5, C4, C69, C7alt, Cm7#5
You can type C-7 for Cm7 (i.e. use the minus sign) or C7-9 for C7b9.

Shortcut Chords
If you enter a lot of songs, you will appreciate these shortcut keys.
J = Maj7
H = m7b5 (H stands for Half diminished)
D = dim
S = 7sus

There's even information on how to add your own chord shortcuts - check it out!

Video Request Answered - Creating Intros, Bridges, and Endings in Band-in-a-Box®

Check out the newest support video created by Kent that explains how to create intros, bridges, and endings in Band-in-a-Box®! Click here to view...

The Band-in-a-Box® SongPicker Feature

If you have a folder of songs that you'd always like easy access to within Band-in-a-Box, make sure you familiarize yourself with The SongPicker feature, which access the folder that you choose and lock it to!

Access the SongPicker by clicking on the [Song] button next to the title of the song within the main screen of Band-in-a-Box. The first time the SongPicker is opened, you can choose the folder to use to create the list by selecting [Change] and navigating to your preferred directory. Once chosen, select [OK - Make Song List], and Band-in-a-Box does the rest... the next time you click on [Song], you'll be taken directly to your preferred folder!

Learn even more about this feature within Chapter 5 of our Online Manual, here.

Just Launched - The FAQ and Knowledge Base Forum!

If you have a question (or questions!) about Band-in-a-Box®, PowerTracks, RealBand®, or any other PG Music Inc. product - whether it be technical support or pre-sales, there's now an easy one-stop spot to find the answer - our FAQ and Knowledge Base Forum!

Don't want to read through the 600+ posts? Use the Search FAQ option, and you can choose your key search terms to locate the topic and answer you're looking for!

Common pre-sales questions about our products, ordering, and delivery:
Pre-Sales

Technical support & troubleshooting by product:
Band-in-a-Box® for Windows
Band-in-a-Box® for Mac
RealBand® for Windows
PowerTracks Pro® Audio for Windows
Other Products

There's even a Request New FAQs forum, if you didn't see your question answered anywhere!

Over 190 Saxophone RealTracks for Band-in-a-Box®!

Today's the day we say "Happy Birthday" to Adolphe Sax, the creator of the Saxophone!
(Adolphe was born November 6, 1814 - 32 years later he patended his saxophone creation!)

We have more than 190 Saxophone RealTracks available for Band-in-a-Box with the following RealTracks Sets - review the complete list here.

Check our our Saxophonist programs for Windows:
The Jazz Saxophonist
The Rock Saxophonist

Forum Stats
28212 Members
59 Forums
54895 Topics
455269 Posts

Max Online: 2434 @ 11/14/17 12:37 AM
Newest Members
RU3, devotrain990, layton, TomTowle, Dische

28211 Registered Users
Top Posters (30 Days)
Noel96 177
Al-David 143
Rustyspoon# 135
Pipeline 118
Matt Finley 118
BlueAttitude 117
Tangmo 117
floyd jane 117
Janice & Bud 116
44kfl 112
Today's Birthdays
No Birthdays