Tube Amp Archive

xtian wrote: ↑Thu Apr 10, 2025 3:50 pm Evil Twin has FX loop? Divide and conquer.

The Twin is not the Evil Twin!

Hello,
8 ohm speaker to 4 ohm tap or
16 ohm speaker to 8 ohm tap.

The MidCut switch is closed if it is not pulled. The MidCut switch is open if it is pulled. Increasing R8=10M will not make any difference. R8 is only there to eliminate any switching sound. Blue line is MidCut not pulled. Green line is MidCut pulled. At 1kHz green is 5.6db lower as the blue. At 2kH...

https://tonestack.yuriturov.com/?s=eNpblljMlJj-NbFsZVKQ0y97BgaGpCBfKB0CpcPAdHJQmBOM4QdmpAR5BrtB1YRDaWcwnViRWJZUVLwwseBLYknzosTMlLSS3KTE5JXJQZ5-ycYW2UlBhimGBgZAOqQ5xcjUIDvREWqAExrftznZEMj1gXJ9kgx9k5wNQWoKkpyNQIbkJTkbJ5uY59HCGkMz-lhjgGENAKqjgW0 TheTwin use the "normal" Fender Treble-Mid-Bass Tonestac...

Lynxtrap wrote: ↑Tue Jun 27, 2023 2:45 pm Looks like a DC coupled LTP.

Hello, if you look at the whole schem you can see that it is NOT DC-coupled.

Hi, have you halved the value of the anode and kathode resistors and doubled the value of the kathode capacitor at the paralleled V1?

I would use audio. For me linear comes up too fast.
You can try what you like better.

Hello,
you have to use a 250K Stereo pot with 2M2 resistors.

Hello,
your Input switch off R3

Hello,
cathodes of 6L6 in Henrys schem are not grounded.

Hey gang, I have a potential customer that wants me to build him a harp amp with a "self split" output section topology. The schem he sent me ( attached) is a bit of a mystery to me, the grid of one of the output tubes is connected to ground, can someone explain the theory of this to me ? Hello Rya...