Hi Quattro Users,
i tuned for a long time my SOHO QTR-1 Quattro Clone, and got the best Results in Hot and Lead with 2 major type of Mod´s
Change the 3 Grid Leak Resistors from 1meg to 470kohm, and changing Values of the coupling Caps.
( while reinstalling the Original use of Lead, without the second Half Use of The Stage , look at the Schematik, it´s easy to realize, on the PCB it was already Prepared )
1meg Grid Leak was way to much, changing takes away the Mud and you get a much more Stabel Tone, without loosing Overtones.
Also there was a 1meg Bass Pot, wich muds anything to Shit, changed it to the desired Value of 250K.
Play it with ADA GCS-2 ( Cab Sim ) with Intellifex Mixed in Wet Only via a Mackie Mixer and i´m in Heaven.
No Problem with differnt PA or Monitor Systems anymore, Now Sounds great over any type of Soundsystem.
Simply Great
V1 Raytheon 12ax7 V2 Siemens ECC83 V3 und V4 Brimar ECC83
The Cathode Bypass Reduce Switching i took out Complete, The Thin Character i took away with clipping out the 220pico Bypass ( see the schematik ) and better Crunch i got this way also.
Put a Choke in, and Good F+T Elektrolytics, etc.....
Dead Silent now, even in Hot Channel via Headphone !!!!!!
Jibbi Du