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#1
Quote from: Roly on November 18, 2013, 12:45:23 PM
Quote from: usernameI've just replaced the burnt R8 resistor and the C12 cap which act as feedback oscillation or so...

That's a bad sign; that's the safety ground lift resistor (to prevent ground loops) and its bypass cap.  It suggests that the amp got a mouthful of mains current between its signal ground and mains ground (or got hit by lightning).

In any case, because it concerns a possible earth fault, most likely in some other gear that was connected to it at some stage, it's pretty important we try and track back when, what, and how this happened.
Hi,
I guess they already were burnt as I bought the poweramp (bought it used)...
...but as I said I replaced them... shouldn't be a problem yet? or do you think that anything else might be defect too?
thanks for all the info, again
cheers,
max
#2
Hi guys,
thanks for all the helpful information... I think I'll go with the P27 preamp...
I've just replaced the burnt R8 resistor and the C12 cap which act as feedback oscillation or so...
Now the poweramp barely clips, even when turned up all the way...

My Setup: Guitar--> Big Muff --> Boss DD7 (Stereo Out) -->Marshall 8008 A Channel--> 4x12" Cab driven Stereo,
                                                                            -->Marshall 8008 B Channel --> which provides 4 Ohm per side

cheers,
max
#3
Would this buffer section http://www.muzique.com/images/buff4.gif
into this preamp section http://www.till.com/articles/GuitarPreamp/images/preamp.gif
provide enough volume increse?
#4
Hi guys,
thanks for your fast replies...

...so...
my guitar goes through the pedals directly into the Poweramp. When I play clean, all the pedals are OFF, so they work just as a buffer (The guitar directly into the poweramp sounds too awful)

I used to own a Digitech Hafler T3 Rack Preamp. With it my Poweramp and Cab was driven to "loud as hell", but I didn't like it's sound so I sold it...

What I'm looking for is a simple (preferably Solid State) design to build an clean Preamp to drive my Poweramp...

#5
Hi guys,
I'm planning to build a transparent, clean sounding stereo preamp...
...why?:
I'm running my pedals directly into a Marshall 8008 Poweramp. I really love the clean sound of my guitar when the poweramp isn't turned on more than 25%.. the guitar- signal is just buffered by my pedals (no preamp)...
because I use no preamp the signal doesn't really get louder as i turn up the volume on my poweramp... it just starts to sound awful.
(It's a shame that i'm not able to annoy my neighbours with a half stack... :grr)

What I'm planning to do:
I'm planning to build a stereo preamp which should just add volume to my guitar signal without influencing the sound of the poweramp too much.

I've been looking for such a preamp- design on the net, but couldn't find any which looks suitable. Does anyone of you guys know what could fit my needs?

thanks for reading,
max