GK BP250

[gtrplayr1976]

Anyone have a schematic for a GK BP250? I haven't had any luck.

[J M Fahey]

If none appears, please post a gut picture.

I *suspect* it canīt be too different from the earlier "200" series, just slightly upgraded from 100 to 125W and sporting a btoroidal transformer instead of the original EI one.

Meaning maybe the earlier schematic can help you, Designers in general have pet ideas and repeat them as long as possible so power amps could be very similar.

That said, also ask GK themselves and post schematic here to be able to help with troubleshooting.

[gtrplayr1976]

If none appears, please post a gut picture.

I *suspect* it canīt be too different from the earlier "200" series, just slightly upgraded from 100 to 125W and sporting a btoroidal transformer instead of the original EI one.

Meaning maybe the earlier schematic can help you, Designers in general have pet ideas and repeat them as long as possible so power amps could be very similar.

That said, also ask GK themselves and post schematic here to be able to help with troubleshooting.

I had contacted GK. Never heard back.

These shots are about what it is inside. An overheated resistor is about the only visible thing I have seen. I was going to recap it at very least. The previous owner told me it just stopped working.

[vintagekiki]

https://elektrotanya.com/gallien-krueger_250ml_250rl_212scl_pa_sm.pdf/download.html

https://elektrotanya.com/showresult?what=gallien-krueger

http://schems.com/bmampscom/gallien/

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/SM_scena/Gallien-krueger/
look Early Schematics (Volume1, 2, 3)

[gtrplayr1976]

https://elektrotanya.com/gallien-krueger_250ml_250rl_212scl_pa_sm.pdf/download.html

https://elektrotanya.com/showresult?what=gallien-krueger

http://schems.com/bmampscom/gallien/

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/SM_scena/Gallien-krueger/
look Early Schematics (Volume1, 2, 3)

Thanks you! I found some very similar as far as the boards on that last link. The Backline series seem to be close. This BP250 may just have a revision higher. 206-0180A VS 206-0180B ? Parts look like they might be the same.