Silver Supporting Member
All models that have Bass and Treble controls should have a Middle control!
Some people like a RAW control as used on Allen amplifiers. This is basically a 25 k or 50 k replacement (or additional control) to the usual 10 k mid control potentiometer, as I understand it. Dialing the RAW way up progressively reduces the effect of the entire tone stack, increasing gain.Anyone else?
Yep, a 50K pot for the Middle control works great as a Mid/Raw control. You still have a regular Middle control up to about 3 and then it gradually removes the tone stack for a boost and/or tweed sounds as you turn it up more. Some builders now just wire an on/off footswitch to it. And some even mount the pot on the footswitch so it's closer for adjustments while playing. I don't like the sound with the tone stack completely removed.Some people like a RAW control as used on Allen amplifiers. This is basically a 25 k or 50 k replacement (or additional control) to the usual 10 k mid control potentiometer, as I understand it. Dialing the RAW way up progressively reduces the effect of the entire tone stack, increasing gain.
The hum balance control is in the heater filiments. Basically an adjustable artificial center tap for the heater filiment winding. Normally just done with two 100 ohm resisters.My late 70s Super Reverb had a "Hum Balance" control which I actually found to be quite useful.
I just read another thread here on looking it up and it turns out the SRRI and TRRI still have it (or did for some period of time) but rather than on the back (where it's easily accessible) it's way up under the chassis in front of the transformer on the Pilot Light side. I've been playing the thing for 12 years or so and didn't realize it was there! I bet a lot of techs don't realize it either...
I'd turn the amp up, adjust the control to minimize as much hum as possible, and then turn it back to usual playing volume. It was extremely quiet idle.
As for the middle control, maybe a switch to bring it in and out so you can have it "authentic" or not (assuming there's not a notch on the middle that is "no middle pot").
I've always wanted verb and trem on both channels...wouldn't actually mind having a different amount of verb on each channel...or have a "dwell" control on the verb. A "shape" knob on the trem would be great - or the option of opto or bias trem, and a switch to toggle between them.
A switch to take V1 out of the circuit without having to pull the tube would be cool.