The Amp Garage

bepone wrote: ↑Thu Apr 04, 2024 7:28 pm lunch box is hammond chassis 1441
https://www.hammfg.com/electronics/smal ... assis/1441

Where do you order this stuff? The lunch box design looks perfect for my new harp amp build.

bepone wrote: ↑Sat Apr 06, 2024 3:49 pm no difference, but are you sure that you wrote that correctly?

I might not have. Can you tell me your thoughts? Newbie still...

Any difference in installing one for the other in a tone stack?

Fairly stock with a large treble cap to dump more range. If it is muddy, a smaller and smaller early stage coupling cap. This can depend on speaker as much as anything. Celestions get your target bandpass without doing anything to a 5e3. What mic do you really like? SM57 with boiled out transformer...

I would like to build a new amp based on the 5E3 or Princeton design that is more geared toward harp use. Harp has some special challenges from the standard guitar circuit designs. The popular purpose-built amps lean toward the bass frequencies without being boomy or flabby, and generally have lower...

I'm considering star grounding my next amp (5E3) and was wondering. Since star grounding can mean more wires back to the post, it could create a spider web in the chassis. Does it make sense to dress the wires together, perhaps twisting them with branches off to the circuit points and back to the gr...

sluckey wrote: ↑Sat Mar 23, 2024 5:03 pm It's redundant. Use one or the other. I prefer the resistors.

Why do you prefer the resistors?

If the power transformer has a center tap to ground for the 6.3 VAC filament power, would it still be a good idea to put the dual 100 ohm resisters from the pilot light to ground, or would this be dumb and cause problems?

GAStan wrote: ↑Wed Mar 20, 2024 6:54 pm What amp are you building?

Looking at a 5E3 Deluxe.

I'm on my third build now, and I want to step up the quiet a bit from my first two. I've read here and other places that most of the hiss and buzz happens at the first preamp stage, and that I should try to mitigate that through grounding, routing, and component selection. Grounding and routing I th...

When you have no cable in a input jack it is shorted and the first gain stage is not functioning from the grid back to the jack. I would then suspect a bad noisy resistor, either on the input jack or the ground reference which is usual a high value like a 1 meg. And yes even new resistors can be qu...

Well, I have most of my issues with my build resolved. Thanks for those who advised me on my fuse blowing and grounding questions. My amp seems to function properly. The only nagging thing left is the hiss. It varies up and down with volume, and seems a little much compared to my professionally buil...

Ten Over wrote: ↑Thu Feb 22, 2024 8:06 pm

Magnatron wrote: ↑Thu Feb 22, 2024 7:54 pm Where does the 6SJ7 pentode tube fall in the gain factor scale as compared to typical triode tubes?

Amplification factor?

Yes. I'm looking for where it falls on the scale against triode preamps as a comparison. This isn't for anything in design, just wondering...

Where does the 6SJ7 pentode tube fall in the gain factor scale as compared to typical triode tubes?

R.G. wrote: ↑Wed Feb 21, 2024 11:40 pm Have you been through the procedure titled "Blows fuses debug" listed at the top of the forum?

I'm running through that right now. I didn't see it until I posted.