Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: boxcarcut on April 16, 2015, 11:26:18 am

Title: Peavey Classic 50 Wiring Help
Post by: boxcarcut on April 16, 2015, 11:26:18 am

Hello Friends.

I recently changed the caps on my old Classic 50 and replaced the power tubes?

I'm not certain I have the transformer wires going to the correct spot.

I did not take any photos before hand and I'm having a heck of a time getting this amp back up and running.

Would someone be so kind to look at some photos I took and let me know if it's correct?

Thanks,
Tom

Title: Re: Peavey Classic 50 Wiring Help
Post by: Willabe on April 16, 2015, 11:31:30 am

Photo's?


           :dontknow:

Title: Re: Peavey Classic 50 Wiring Help
Post by: boxcarcut on April 16, 2015, 11:44:14 am

https://www.flickr.com/photos/34258368@N03/sets/72157651586519850/ (https://www.flickr.com/photos/34258368@N03/sets/72157651586519850/)

I hooked it back and got very little sound out of it. I also can't find the proper schematic to check voltages.

Looking for some help

Title: Re: Peavey Classic 50 Wiring Help
Post by: mresistor on April 16, 2015, 11:57:52 am

Heres the schematic   http://el34world.com/charts/Schematics/files/peavey/peavey_classic50.pdf (http://el34world.com/charts/Schematics/files/peavey/peavey_classic50.pdf)

Is the connector with the blue and brown wires the one that goes to the OT input? If so can it be inserted backwards/reversed? If so you could have reversed it and now it's out of phase.

Title: Re: Peavey Classic 50 Wiring Help
Post by: labb on April 16, 2015, 12:14:40 pm

Check the ribbon cables connections very close

Title: Re: Peavey Classic 50 Wiring Help
Post by: mresistor on April 16, 2015, 12:15:40 pm

Which transformer are you talking about? Using the schematic link I posted you should be able to check the voltages on the HVPS nodes; plate, screen, etc.