Tube Amp Archive

Well my new transformer worked out great. I even tried out the B+ on my thumb! Thank you all for the input.

I have a couple questions/requests: > Can we see a wiring diagram for the transformer? > Which transformer wire is actually connected to the chassis, or is the only ground connection through the frame of said transformer? Just Curious? Gene I dont have the diagram I'm front of me right now but it's...

I have a chance to purchase a Gibson GA-30 amp, early 60s tweed. The reverb is not working and the 60 cycle hum is really loud. I am thinking about buying to fix up and sell or keep, not sure yet. Is $800 too high for a project like this? It has original speakers and transformers, and looks like som...

Egad, continuity between the yellow wires and the chassis? I hadn't imagined such a thing. I agree it's shorted. That's a bad PT. Let's punish it. :twisted: Seriously, if purchased new, I'd expect Heyboer will remedy the situation. Maybe if he asks nicely, they will compensate him for the blown rec...

The 5v secondary should read infinity ohms to ground, no? When in circuit it should read pretty high, certainly not .5Ω. Disconnect both yellow wires from the tube socket and check each wire for resistance to chassis. Resistance should be infinity. If still have resistance, then PT is bad.. But if ...

Does this issue only occur when the 5Y3 is plugged in? If so, the PT is not likely the problem. If the 5v winding has a center tap just tape it off and don't connect it to anything. but I still get continuity to ground with all center taps lifted Continuity to ground from what? Is this continuity z...

I have a new Heyboer 330-0-330 PT that is shorting my high voltage through the 5v filament when rectifier tube is installed. Anyone ever have bad luck like this? I'm fairly new to building amps, but I work in control circuitry and have never had any issues with any other amp builds. My first thought...