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Help! Tech S.O.S (Off topic)
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eddie1261
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eddie1261
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Would they produce and amp that wasn't safe for you as it is?
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Help! Tech S.O.S (Off topic)
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Joined: Nov 2017
Posts: 40
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Enthusiast
Joined: Nov 2017
Posts: 40 |
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.
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Help! Tech S.O.S (Off topic)
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Joined: Nov 2007
Posts: 5,350
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Joined: Nov 2007
Posts: 5,350 |
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.
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Help! Tech S.O.S (Off topic)
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Joined: Jun 2000
Posts: 2,476
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Joined: Jun 2000
Posts: 2,476 |
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
Last edited by Larry Kehl; 01/20/18 11:46 AM.
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Help! Tech S.O.S (Off topic)
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Joined: Jun 2000
Posts: 2,476
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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=141sLarry
Last edited by Larry Kehl; 02/13/18 09:06 AM.
Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20
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