Morning!

First I want to thank you for the replys;

@Roly:
Voltage across speaker socket(s) is (-)0.06v - ok to my eyes.

I have to admit here that this is my first SS-Amp I really "use" - So I was also wondering by myself, if the behaviour is normal ... (Roly seems to hear something "unusual" too... ??)

BUT to my subjective feeling the "SS-Clipping" should be MUCH smoother - If this amp sounds like it should sound, its the wrong amp for me 

(Parts have been changed because of silly and desperate feelings, s.a.)

---> I'll get myself a TL072 / LM833 and give it a last chance ... (and solder in a socket)

Chris

Hello!

I've got a Marshall Lead 12 (Stack Version) which has quite a strange "overdrive behavior" - I recorded it via Mic and Line out (mp3 attached - Mic+Line-out/ Mic only/ Line out only) - the "brzzzzzzz" is what i mean....

A shematic and rough information about the amp can be found here:
http://www.ssguitar.com/index.php?topic=2826.msg20791
http://www.drtube.com/schematics/marshall/3005.gif

Giving a singal to the power-stage only gives a clear and *loud* sound - This lead me to look a the preamp section:
Measured to Chassis/0V

C18: 17.8V
C17: -17.8V
IC1/Pin8: 13.4V
IC1/Pin4: -13.4V

From Tranny: AC 13.7V (x2)

Done so far (Problem & Voltages were monitored and stayed the same): New Bridge Rectifier, ElCaps, InputJacks, Gain Pot.

Do you have any advise for me?

Thanks in advance
Chris