Yamaha G50 output biasing problem

[J M Fahey]

Well, don't spit, but you are welcome to come to town. Been very hot and fairly humid lately.

But then I live next door to a brewery.

https://www.badbrewing.com/

(In the video on the home page, right after the MASON sign is a view from across the street, and in the background to the left is the old High School building. I live in that building.)

You mean this?


Nice

[Enzo]

Yep, that is the side of the building.

[nosaj]

Yep, that is the side of the building.

Now we have a game, which window is Enzo's

nosaj

[Enzo]

My apartment faces the atrium in the center. Very hard to get a photo of it from a street.

[glebert]

Well, don't spit, but you are welcome to come to town. Been very hot and fairly humid lately.

But then I live next door to a brewery.

https://www.badbrewing.com/

(In the video on the home page, right after the MASON sign is a view from across the street, and in the background to the left is the old High School building. I live in that building.)

Hmm, actually trying to put together a meet-up with old Michigan Tech friends and that would be about an hour away from everyone (AA, GR, and Mt. Pleasant) so Bad Brewing might be a good idea. If we head there I'd be happy to buy you a beer or three.

[Enzo]

I can drink there and walk home.

[g1]

Ok, six.

[glebert]

Finally got back to this. Put in new capacitors and the amp sounds very good, voltage at output capacitor comes right up to half of the +B voltage. I have no idea how to set the trimmer pots, though. For the one at the emitters of TR10, 11 I set it to balance the voltages at the collectors. For the other two trimmers don't know where they should be set, but since my voltage is coming up to where I want and don't seem to have crossover distortion I don't know if I should worry about them or not.

Oh, never did get down to Lansing to buy Enzo those beers.

[Enzo]

I died of thirst while I was waiting...waiting...waiting...

[g1]

I have no idea how to set the trimmer pots, though. For the one at the emitters of TR10, 11 I set it to balance the voltages at the collectors. For the other two trimmers don't know where they should be set, but since my voltage is coming up to where I want and don't seem to have crossover distortion I don't know if I should worry about them or not.

See page 4 (&8) of the attached service manual. May not be the same version, but the trimmers are pretty much the same, circuit-wise.

[glebert]

Awesome, thanks!