Tube Amp Archive

Yes, I have the 6.3v secondaries lifted 100 ohms off ground. I tried an interconnect grounded at one end only into the power amp, and it was noisier than the one grounded at both ends. I starting to think I'm just being anal about the additional 60 Hz hum. There's definitely more there than with the...

On their own, both amp and D'lator are very quiet and sound great. They even sound right together so long as the AC ground is lifted on the D'lator. I do have two PTs in the D'Lator, one at 1:1 feeding the voltage doubler, and another for the 6.3v filament supply. Would you suspect some screw up in ...

I recently finished a Dumbleator to go with a non-HRM ODS clone. A power conditioner feeds AC to both. When I plug the D'Lator in, however, I get a 60Hz hum into the amp. The hum is there even with the D'Lator off. I can cure the problem by lifting the ground lug off the male end of the D'Lator's AC...

The Jazz setting is great for getting Country swing jazz sounds ala Bob wills and the texas playboys! I like the FET input with my lap steels, especially the ones with low output pickups, I rarely hear of Mr. Dave playing 6 string these days, mostly bozuki, saz, violin, and lap steel - perhaps that...

I'm just curious about the FET input on the Dumble ODS. I was reading some past discussions and the general opinion was that the FET input is, for the most part, not very usable. I was checking out the latest issue of Fretboard Journal which features an interview with David Lindley by Ben Harper (e...

I think Brandon has his PT's wound with two 6.3v windings. I've noticed and amp or two of Gil's wired the same way I think. Yes. Also, the yellow leads are something like 16awg, whereas the green leads are maybe 20awg. Since both secondaries put out the same voltage, wouldn't it make sense to go wi...

I believe it's a Heyboer. My understanding is that it has a 6.3v ac tap for the relays. I'm pretty sure it's the same one Gil used in his No. 9 amp, and I wired it up the same way. The in-circuit voltages are a bit jumpy, but my meter reads 7v ac across the green leads, and 6.9v ac across the yello...

I just finished my first build from the ground up (non-HRM Skyliner). Welcome to the Forum - nothing make you feel better than a successful build. :) I do have a question about how the experienced here use the PAB and OD. I read somewhere here that the OD is designed to be used with the PAB, which ...

welcome! What power transformer are you using? Just going by common color conventions, it looks like you have your 6v & 5v windings crossed, with the 6v winding going to the relays and your 5v winding to the heaters. If that is the case, and your heaters are underpowered, that would explain some......

Hard to tell by the pictures, but it looks like you have the OD coupling caps reversed (judging by cap size). OD1 coupler should be .01uF and OD2 should be .005uF. If they are indeed switched, it could be contributing to the farty bass. BTW, welcome to the forum!!! Pretty sure they're right: the sm...

Hello, Garage mates, I'm a friend Gil's, Chris's, and Bill's, but am new to this forum. With Gil's encouragement and invaluable help (and a chassis, trannies and boards from Brandon), I just finished my first build from the ground up (non-HRM Skyliner). I think the clean on this amp is just about pe...