Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Hi:

I looking for a nice preamp for my future amp and founded this....

(http://www.forosdeelectronica.com/attachment.php?attachmentid=6658&d=1205854056)

May ask what our masters think about it?

EDIT: Done. Loaded the jpg.

Quote from: polo16mi on September 16, 2009, 10:41:53 AM
Hi:

I looking for a nice preamp for my future amp and founded this....

(http://www.forosdeelectronica.com/attachment.php?attachmentid=6658&d=1205854056)

May ask what our masters think about it?

Your link does not work, it requires that you be logged into that forum for it to display.  You could save the image, then upload it here.

I am no master,but FWIW(not alot)
I think the input impedence is a little low.
I would change the 100n to 200n(input cap) and lower the 1st stages bypass to something around 4.7uf or lower(like680n) and lower the bias resistor to around 820R.
I like a warmer biased triode.
The way it is- its biased clean and should sound good.

It looks like a decent pre-amp.
The huge filter cap and voltage regulator on the DC heaters is something not usually seen on guitar amps,more a HIFi 300B type setup,all its missing is the choke.
Again that will help the sound removing heater noise from the circuit.

OK I looked at it some more that attack set-up looks pretty cool.
In that it should make some fairly high gain sounds.
And with the cathode follower at the end the impedence will be low for use with an SS PA.