Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: fossilshark on February 06, 2023, 07:36:00 pm

Title: effects loop voltage
Post by: fossilshark on February 06, 2023, 07:36:00 pm

I was just wondering why this valve wizard effects loop circuit says to run the effects loop off a seperate 10k drop resistor instead of just hooking R8 and R4 behind the 10k in this photo going to a cathode follower stage. Couldn't I just remove the 10k drop resistor (RP) and run it right off the cathode follower stage B+? I would just need to up the wattage of that 10k I think.

Title: Re: effects loop voltage
Post by: glass54 on February 06, 2023, 09:34:48 pm

Hi FS,
My guess is Power Supply decoupling. Don't forget you are exiting your amp and re-entering (through "unknown" territory)
I am a fan of PS decoupling at different stages/functions of amplifiers. We often see queries regarding problems which simply are a result of poor PS decoupling. Try it both ways? See what works. The Wizard can be VERY thorough  :laugh:
Regards,
Mirek

Title: Re: effects loop voltage
Post by: fossilshark on February 07, 2023, 09:19:54 pm

This is a good point. A few extra wires +/- a resistor and a capacitor is something I can probably manage to try with or without.