Quote:
Originally Posted by Peter
I came up with some great modifications for my AVT50 amp:
1. The obvious mod: add a second speaker jack.
2. Installed a clean channel midrange control.
3. Increased preamp tube gain by around 25% (switched).
4. Installed a 6 position mid shift switch on the Overdrive channel with the stock midrange frequency, and 5 others [a great mod in any amp].
5. I reinforced some key components in the amp with higher wattage and voltage components (cheap insurance).
The fatter tones from the mid shift switch along with the extra tube drive really really brought the amp to life. The amp sounds 100% way better, and I didn't even drive the tube nearly as hot as in other tube amps. The clean channel tube sound really rocks on full gain, and rolls off at lower gains. Very impressive improvements. I am also working on an optoelectronically controlled footswitch for Lead Boost and Scoop. Anybody out there interested in Kits? I am interested in producing them.
 PETER THE TONE DOCTOR |
How did you manage to increase the gain by that much? - I've tried to increase my preamp gain by adding a 4.7 uF capacitor in parallel to the first cathode resistor(R29 on the official schematic), which kinda improved the distortion, but it's nowhere close the 25% you're talking about. I didn't actually measure anything though. Cheers, Ivan