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Messages - stefi83

#2
Many thanks for sharing your comments!
I've been thinking about all your answers, and now I feel more relaxed about leaving it as is and agree eventually to experiment something else outside.
To complete the analysis I add the corrispondig simultation made with a test signal of vi=200mv SINE at 1KHz in input, maximum gain and vo2 before the tone controls. If I've done correctly I find it very simmetrical and squared. I see those rails pointed by Fahey, too :)
Stefano
#3
Ok I agree... I'm just trying to understand the circuit, evaluating if I have the chance to tweak its parameters.
From a technical point of view I went to the following points:
- both stages are non inverting, with gain being in the form G=1+Rf/R
- with the supply voltage at +/-16v, the 1st stage is raising the signal with high pass filter and no clip aims
- the 2nd stage has a lot of gain and can clip when driven by VR1, with some kind of band pass
- I draw with computer the transfer functions vs. frequency, separately, considering also the capacitors, and I attach the results.
Any comment is apprecciated.
Thanks
#4
Hello, I'm new... a greeting to all you! :)
I recently bought used this amp in pretty good conditions, and I am getting more enthusiast while reading about it in forums and posts.
Now about the overdriven tones, I was wondering what was the easiest way to increase the gain without upsetting the circuit.
Looking to the preamp stage, what do you think about:
- at the first stage, raising the value of R7
- at the first stage, to work on R5 and C1
- at the second stage?
I'd avoid adding diodes, because I don't see diodes in an old marshall super lead, for example.
Thanks,
Stefano