BALDWIN GERMANIUM AMPLIFIER

ba3jar · 5th May 2012, 12:48 PM

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

simon7000 · 5th May 2012, 02:21 PM

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.

ba3jar · 5th May 2012, 03:41 PM

do you know which PNP model number used in such amp?

simon7000 · 5th May 2012, 04:11 PM

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.

simon7000 · 6th May 2012, 03:55 PM

There is a schematic of a typical small germanium power amplifier here Germanium preamp .

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.

tritium · 24th May 2012, 09:00 PM

Hello
I have the schematic for the baldwin amp.
email me at beercity@wi.twcbc.com
Roy

evette · 25th May 2012, 08:35 PM

output transistors are 2n2147 rca top hat series. Evette

5th May 2012, 12:48 PM	#1
ba3jar diyAudio Member Join Date: Mar 2012	BALDWIN GERMANIUM AMPLIFIER 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

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5th May 2012, 02:21 PM	#2
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	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.

5th May 2012, 03:41 PM	#3
ba3jar diyAudio Member Join Date: Mar 2012	do you know which PNP model number used in such amp?

5th May 2012, 04:11 PM	#4
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	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.

6th May 2012, 03:55 PM	#5
simon7000 diyAudio Member Join Date: Nov 2008 Location: Oakmont PA	There is a schematic of a typical small germanium power amplifier here Germanium preamp . 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.

24th May 2012, 09:00 PM	#6
tritium diyAudio Member Join Date: Nov 2010	Hello I have the schematic for the baldwin amp. email me at beercity@wi.twcbc.com Roy

25th May 2012, 08:35 PM	#7
evette diyAudio Member Join Date: Jun 2006	output transistors are 2n2147 rca top hat series. Evette