Hi
i'm looking for schematic belong to a Baldwin Professional germanium amp , can anyone help ?please
the amp with the link bellow:
BALDWIN GERMANIUM GUITAR AMPLIFIER AMP REVERB TREMOLO TIMBRE WILLY NELSON | eBay
i'm looking for schematic belong to a Baldwin Professional germanium amp , can anyone help ?please
the amp with the link bellow:
BALDWIN GERMANIUM GUITAR AMPLIFIER AMP REVERB TREMOLO TIMBRE WILLY NELSON | eBay
It has been a long time since I looked at a Baldwin amplifier schematic. It used all PNP power transistors and interstage transformers. But sorry don't have a copy.
As I recall it was a house number, but the standard NTE replacement Germanium PNP power transistor as a pair worked just fine to repair it.
The driver transformer was quite hefty, that would be the piece that might have had the most effect on the sound.
The driver transformer was quite hefty, that would be the piece that might have had the most effect on the sound.
There is a schematic of a typical small germanium power amplifier here http://www.diyaudio.com/forums/solid-state/212212-germanium-preamp.html .
You would add one stage to this to make a higher power amplifier. Note how the bias is adjusted and provided through the interstage coupling transformer. That is what I suspect gives the sound you are looking for. Since a matched pair of germanium power transistors are around $75.00 you might want to try using silicon for the driver and output stage.
The design there also shows transformer winding ratios! That should get you started.
Best of luck.
You would add one stage to this to make a higher power amplifier. Note how the bias is adjusted and provided through the interstage coupling transformer. That is what I suspect gives the sound you are looking for. Since a matched pair of germanium power transistors are around $75.00 you might want to try using silicon for the driver and output stage.
The design there also shows transformer winding ratios! That should get you started.
Best of luck.
- Status
- Not open for further replies.