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#452307 - 01/19/18 07:43 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
eddie1261 - gone Online   content

Registered: 04/08/11
Posts: 4371
Would they produce and amp that wasn't safe for you as it is?
I have resigned my forum account. I will no longer be posting.

#452351 - 01/20/18 03:59 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
duncanwhyte Offline

Registered: 11/19/17
Posts: 32
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.

#452356 - 01/20/18 04:33 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: duncanwhyte]
BlueAttitude Offline

Registered: 11/30/07
Posts: 1389
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.

Blue Attitude: Homepage, Latest song: Time Flies

#452480 - 01/20/18 02:45 PM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: eddie1261 - gone]
Larry Kehl Offline

Registered: 06/04/00
Posts: 2069
Loc: New Mexico

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.


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

#457367 - 02/13/18 11:57 AM [Help! Tech S.O.S (Off topic)] Re: Amp power: 2 prong to 3 prong [Re: flatfoot]
Larry Kehl Offline

Registered: 06/04/00
Posts: 2069
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)

(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


Edited by Larry Kehl (02/13/18 12:06 PM)
Win7&10 Pro 64,i7-2600k,32GB,1OTBs HDD,RX480 8GB,FW-410,MIDIplus4x4,Montage7,Fusion 8HD,QS8,GR-50,Integra7, XV5080,Fantom-XR,QSR,SC-8850,Nanosynth,SPLAT,AD2,ST3,Kontakt 5,Amptube4,way too many other VSTi's - but I'm really a guitar player

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Thoughts on Band-in-a-Box® 2017 - Mac Power Users Discussion

David Sparks and Katie Floyd discuss a variety of topics in their recent episide of Mac Power Users: - listen all the way through (and laugh along with them - it was a very entertaining episode!), or jump to 1:37:40 where David shares his thoughts on Band-in-a-Box® 2017 for Mac!

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Polish New Features Video for Band-in-a-Box® 2018 for Windows

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Get to Know the 202 NEW RealTracks Released with Band-in-a-Box® 2018!

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You can also listen to demos of RealTracks Set 278: Shiny Vocal Oohs & Aahs here.

This RealTracks Set is available for just $29, and is also included in RealPAK 14: Country, and the Band-in-a-Box® UltraPAK, Audiophile, or 2018 PlusPAK Upgrade.

Video RealTracks for Band-in-a-Box® 2018 for Mac - Special Pricing Until June 30th!

With the recent Band-in-a-Box® 2018 for Mac release, we also released Video RealTracks Sets!

Video RealTracks allow you to see the RealTracks artist playing that track - you can use them just like any other RealTrack, and you can generate a video which will display the musician playing your song exactly as you hear it. You can also include a chord sheet or notation in the video.

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Video RealTracks Set 2: Country TrainBeat Band is included in the 2018 49-PAK, along with 40 Bonus UNRELEASED RealTracks, 22 MIDI SuperTracks, 101 Instrumental Studies, and Artist Performance Set 8: Traditional Songs Sung by Béatrix Méthé.

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Band-in-a-Box® Version 2018 is a HIT!

Since the release Band-in-a-Box® 2018 for Mac, we've received some great feedback!

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"'s educational utility and the potential is awesome!!!"
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