De Clean Finished - Too clean. how to get more gain?

[Ranalog]

Firts of all, sorry for my English, I am from Barcelona.



I have finished DE Clean, with some modifications in the Eq section, buffered fx loop etc.

Two weeks after test it, I think that it's very very clean amp. I put the Firts volume at 10, and I can't get hair sound. I love the tone of this amp ut I want to get some hair sound around 6-7 of the volumen pot.

I Want to get it, What can I do?
I can name Gain the potentiomer after treble isn't it?
This is the schematic;
https://tubeamparchive.com/download/file.php?id=28388


Thanks![/code]

[Colossal]

What power transformer and voltages are you running?

[Ranalog]

The power trans is a hammond 290EEx and here the voltages!

[jelle]

Your preamp voltages look ok. The power amp ones, I cannot see.

What is your bias current?

jelle

[Ranalog]

The bias current is 50 ma

I want to up a little the gain in the preamp,

I only hear something moregain when I put the master level up of 8, But it's gain comes from power stage.

[tele_player]

I would try reducing headroom in the second stage with a smaller cathode resistor.

-Robert

[ToneMerc]

The bias current is 50 ma

I want to up a little the gain in the preamp,

I only hear something moregain when I put the master level up of 8, But it's gain comes from power stage.

It's only 2 gain stages so you are limited. However, with no topology changes you could do a simple tone stack lift aka PAB(pre amp boost) mod. Modded I would drop he cathode cap values to 4.7uf and transpose the V1a and b plate/cathode values or make both symmetrical and try 220K/1.5K.

TM

[Ranalog]

this PAB modification is ad one more stage?

[ToneMerc]

this PAB modification is ad one more stage?

https://tubeamparchive.com/viewtopic.php?t=15229

TM

[Ranalog]

if I want to increase the gain adding a new stage, What schematic I could use?

[Zippy]

Why not use the OD channel and omit the clean channel - ie, hardwire the OD without switching and excess switches.

[Synchu]

I would first make the NFB switchable and switch it off This should give some hair back.
Niki

[Zippy]

I would first make the NFB switchable and switch it off This should give some hair back.
Niki

Whoa, is it that simple? Would that work for me?

I lost most of my hair a long time ago...

(Good call)

[Ranalog]

why two rock custom reverb, with more or less the same schemeatic, when put the gain more than 8 start to break. (I only take in consideration the clean channel of two rock)

[Synchu]

Plate and cathode resistors on the gain stages are rather different (100k/1.5k), NFB as well. (4.7k/390R), which biases the stage differently than yours.
I would in any case try lifting the NFB as a first step, since it's quite easy.
See a bit more here - http://www.aikenamps.com/index.php/desi ... e-feedback

Zippy NFB is the first step - couple Marshall Major stacks cranked to eleven might have the desired result, no?

Niki