Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: fossilshark on December 04, 2024, 08:43:21 am

Title: High gain plexi?
Post by: fossilshark on December 04, 2024, 08:43:21 am

Hi all, I am in a bit of a predicament. A while ago I had 2 chassis fabricated for JCM800 2204s, however I now want a Plexi.

Since the chassis only has a hole for 1 gain knob (I can squeeze another pot next to it but it would look ugly) do you guys think it would sound good if I cascaded the V1 gain stages and wired the 2 input jacks to be high and low like the input of a JCM800? I'm sure I can tweak the cathode component values if needed and not mess up the layout too much.

So, crowded faceplate or high gain Plexi?

Title: Re: High gain plexi?
Post by: Merlin on December 04, 2024, 09:40:07 am

Do you have room for small switches? PharmRock did something kinda similar in this thread "This basically is a mod to a 1959 circuit that allows for switchable 2204, including the Lo Input."
https://el34world.com/Forum/index.php?topic=27364.0

 (https://el34world.com/Forum/index.php?topic=27364.0)Input schem:
https://el34world.com/Forum/index.php?action=dlattach;topic=27077.0;attach=89746 (https://el34world.com/Forum/index.php?action=dlattach;topic=27077.0;attach=89746)

Title: Re: High gain plexi?
Post by: fossilshark on December 04, 2024, 10:05:08 am

Thats not a bad idea, so I can switch between stock plexi and 2204. I am definitely going to look into that.