Recent content by oldsmobuick

They were hand-wound in-house, according to the info on Bartell Guitars and Basses

I picked up an EMC bass rig with the Performer I head and two EMC cabs, each with 2x Jensen 15" drivers. Before buying, I looked all over and found almost no info and no schematic for this model, not even a photo. Does anyone have info on the Performer I or own this unit? It's really simple in...

Thanks for the tip! I'll do that in future.

And a happy conclusion with the B25B, I received and installed the replacement OPT from Fliptops (the fit and finish are great by the way), and bingo we are up and running! Lots of power and a really nice tone! Should last another 50 years!

That’s great, thanks. I feel good about buying from them as they were pretty helpful on the phone. I’ll report back when I get it installed. I’ll double check everything in circuit and use the dim bulb tester as I have been after every change. Thanks guys!

There’s definitely nothing readable between red:brown or red:blue. The fliptops link you sent earlier is the Heyboer? or is that elsewhere? Thanks for the assist!

Thanks for the tip, I called Fliptops and the guy was really helpful. His first question was what the resistance readings are on the OPT windings with all the leads detached from the amp and power tubes out. He wanted to know load between red center tap of the primary windings and the windings...

Thanks! I'm up in Maine, not likely anyone super close but I appreciate the thought! And who knows :)

Please point me to the terms I accepted that specify that posters need to have college-level troubleshooting courses under their belts. Your attitude is elitist and unhelpful regardless of what undergrad night class you taught. Again you didn't even ask about troubleshooting performed along the...

Thank you! They are enjoyable to play and even to work on, very solid old amps!

If you’d like to know more about the troubleshooting I did, you are welcome to ask. And if not, maybe just don’t say anything. You didn’t offer any help. You are the problem that makes people not want to use or try out forums. And I diagnose that as: being a bully. Now you go troubleshoot that.

FYI, here's a different schemo showing both death caps.

Hey, so I tried your suggestions and can report the following: A known-good preamp into the EXT AMP jack of the B25B also makes no sound Bias voltage where R33 and R34 join is -67v with power tubes out verified + of the 10uF bias caps go to ground. grounding to pin 8 of both power tubes is...

Thanks for the note Corey, I guess I need to explain (again) that these were troubleshooting measures, not "elective surgery" as has been suggested by several of the responses so far. There is no exact schematic available for this amp, it seems, and no paper version on the chassis. I did find a...

Thanks for the next steps— I’ll dig in again tomorrow and report back! -Nick