Tube Amp Archive

Hey Rick, I've been busy moving to a new house and then got sidetracked building a Metro JTM45 so I missed this seeing thread earlier, but your comments about the gain really hit home with me. I got back to tweaking this amp and correcting some mistakes a week or so ago. Once my wiring was cleaned u...

The MASS keeps things feeling more natural to my ears, doesn't get to feeling squashed and thin as fast as other attenuators. Plus since it can be a load box for biasing, etc. it serves me well for two different purposes. I verified those tranny numbers last night, I had it right. I just need some t...

The 270HX power tranny and the 1620 output (at least I think those are the right numbers, they're from memory.)

Just good ol' Rustoleum Metallic, I think I did three coats. Let it sit, label the chassis and then three coats of Rustoleum Enamel clear. Any Home Depot should have it on the shelf. Originally I did it in a light blue Hammertone, but I exercised my American Male right to not read the instructions a...

Does the howl change withe the presence-setting? Maybe you wired the primary of the OT wrong, so you get positive FB instead of negative. Try interchanging the primary wire on the plates of your power tubes. Good luck! Timo I would have suspected this.....if it howled nonstop and didn't even let a ...

Got to play the amp this afternoon, and of course discovered a couple of issues to deal with. First off is major headroom issues, volume on one is nice and crisp but you hit three on the volume and sound like your guitar is on ten into a bad fuzz. I think the only issue here is voltages, V1 and V2 a...

It's a painted Hammond chassis, I'm on the cheap here. The knob on the top is actually my bias adjustment. I didn't have the correct value resistor when I did the two joined together, so when I get around to moving them directly onto the cap can above the turret board there will only be one resistor...

I almost didn't post this here. Because to many I may be committing sacrilige by augmenting the TrainWreck design to suit my purposes. But even Omar confessed at the MetroAmp forum that he was putting a switchable tube-rectified/SS-rectified power supply in his build, so if he can commit the ultimat...

Aren't the bias pots in the vast majority of blackface era Fenders carbon comp, or are they a different composition? Look like any other CTS/etc. brand pot that Fender used, except for the screwdriver-friendly shaft.