Tame a Bohemia???

[jejj]

I built a Bohemia for a buddy and the gain structure is just way more than my Vox AC15 or his Pro Reverb can handle. Is there any mods I can do to tame this little beast?

Thanks!!

 

[Nostradoomus]

Is it the distortion gain or the treble? I’ve replaced the 47pf cap at C11 with a 10 or 15pf with good results for the treble, might help with the overall gain too. Could also try a different transistor in place of the 2222a or dropping C7 down to 1uf or C10 down to 10uf.

 

[jejj]

It's the distortion gain. I have a metal cap 2N2222a, which I can replace if need be. I can drop C7 & C10 and see what that does for me first.

Thanks for the help!!

 

[Chuck D. Bones]

Changing Q1 won't make any difference in the gain. Try increasing R17 to 10K to lower the 3rd stage gain. As an example, The Wampler Soverign (Monarch Distortion) has a BOOST switch on the source resistors for the 1st & 2nd stages to alter the gain.

 

[Jiuk]

If you want less gain, then choose high Hfe transitor for Q1.

 

[Chuck D. Bones]

Can you explain how that works? I'm not seeing it.