The Amp Garage

Here they are.
I wonder If I can use this to rebuild my abominable Korean Hiwatt?
Can the power section be reworked for el84?

They lowered the negative feed back resistor from 10k to 7k.

It could be that a better way to look at the phase splitter is like this.

It has a center tap. I tried 2 100 ohm resistors at one point instead. It helped with the hum but added hiss. I also tried diodes to lower the voltages. 2 X 10 watt .22 wirewound was the quieter route to go. The hum isn't really the biggest problem. The buzz is coming in at the input (a 102 cap to g...

Was the 470k resistor changed to 47k like on the Hiwatt ol? What I found too was ditching the efx loop completely improved things right away. Maybe this might work for the Hiwatt tone stack. But this amp has a really poor pcb design and that's a problem straight away along with the hardware setup.A ...

I'm not quite sure how to rebuild it so I would have to get the Oconnor book which might help if I go that route.Was it tough to rebuild at all? You know far more than I do. I did try a low gain version which actually was quite interesting. Have you seen the sa210 schematic?That could be an interest...

Fernandes put it out . I'm not surprised it didn't sound good. If you follow the board values the gain is too strong and you lose the note definition. It's interesting and packs a wallop at low level, but once you play on a better amp you realize the circuit is too much. That's probably why it was m...

It's not a lead 20 schematic it's a schematic for the Korean Custom 20 tube, an amp full of design errors.They were modded by Fernandez to try to solve the design goofs causing hum and buzz with 2 15k resistors on the cathodes.Turned up they are really noisy.Some also had low pass filters installed ...

Was it confirmed that this is the lead 20?
I originally posted the amp schematic.
If anyone would like more info on the amp
let me know.
The pcb version has a lot of problems.