Tube Amp Archive

I can never remember them.

On second thought, I think what I got was IN4004 or 6. I don't have them with me to check.

I do remember that they had peak reverse voltage of 600V. And a forward rectified current of 1A.

Does that work?

I'm building a one tube preamp.

Nice datasheet, Phil!

My transformer specs as follows: PRI: 110-120V: 60HZ, 250VCT@25DCMA with a center tap, 6.3V @1.0A.

Can I use (2) IN4003 diodes instead of IN4007s? It's all Radio Shuck had.

Thanks, guys.

Yeah well, I haven't done anything to affect the EL-34s, though they have fallen a little bit. I'm more interested in the preamp and PI voltages. Particularly concerning is Firestorm's comment that lowering the voltage on the PI will reduce its gain and headroom. Headroom reduction would be fine (th...

Yeah well, I haven't done anything to affect the EL-34s, though they have fallen a little bit. I'm more interested in the preamp and PI voltages. Particularly concerning is Firestorm's comment that lowering the voltage on the PI will reduce its gain and headroom. Headroom reduction would be fine (th...

Yeah BillyZ, already got all of that in place. Pretty happy with it, as in very happy. Someone somewhere somewhen said that high voltages don't sound as good for guitar, so using a JTM-45 voltage chart I found online I set about lowering them. I've tried several configurations at this point, includi...

I have a '68 YBA-1 (has a choke, SS rectifier, and EL-34s), which as you probably already know is very similar to a tweed Bassman or JTM-45. But of course a Bassman/JTM-45 that's been optimized for bass. The voltages are on the high side. I'm new to the subject, so I'm looking to get a bit of educat...