Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Captain chunkulus on July 18, 2018, 04:20:28 pm

Title: Resister with bypass cap switched in over an existing cathode resistor.
Post by: Captain chunkulus on July 18, 2018, 04:20:28 pm

So, this is the circuit. I have removed the 4.7k and .68uf cap and replaced them with  a 2.7k with a 1uf bypass cap over it in parallel with the 15k resister. When the relay is switched in, I now get a thuddy pop. Before when the circuit was stock there wasn't any audible click or pop. Anyone have any ideas on how to silence the pop when switching the resister/ bypass cap in and out? Thanks.

Title: Re: Resister with bypass cap switched in over an existing cathode resistor.
Post by: Captain chunkulus on July 18, 2018, 04:29:31 pm

Here is the modified circuit.

Title: Re: Resister with bypass cap switched in over an existing cathode resistor.
Post by: shooter on July 18, 2018, 06:44:12 pm

here's what I did in a similar build, I don't like relays, and for some reason guitar players like knobs  :icon_biggrin:

Title: Re: Resister with bypass cap switched in over an existing cathode resistor.
Post by: PRR on July 18, 2018, 09:51:40 pm

You are significantly changing the DC bias point. It's gonna POP.

Flinch.