Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Deric on September 27, 2023, 05:32:40 pm
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I was recently asked about removing the T filter in a Gibson GA-20 RVT. I was referred to this video
https://www.youtube.com/watch?v=p2yFgikXrLo (https://www.youtube.com/watch?v=p2yFgikXrLo)
In the video he removes the filter network and replaces it with a .01u 600v cap and adds a 1M resistor from the following grid to ground. Couldn't you just replace the filter with a piece of wire? There is already a coupling cap between the first gain stage and tone controls/volume pot and the following grid would be referenced to ground via the volume pot.
Am I missing something?
https://el34world.com/charts/Schematics/files/Gibson/Gibson_ga20rvt.pdf
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You mean this section of the 7 minute video (https://youtu.be/p2yFgikXrLo?t=123)?
> Couldn't you just replace the filter with a piece of wire?
In this case, yes. For many hackers, and many mis-documented Gibsons, an R-C is a two-buck all-purpose safer solution.
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Yes, that part of the video. Thanks for confirming my thoughts.