The Amp Garage

Living in Europe, i do a lot of business with Tube Town and I've always had a good experience with them. They are usually supportive as long as you don't hit them with too many sophisticated problems. English probably isn't their first language. If you order from them, do an inventory of the kit par...

Just curious. Does anyone recognise the make of this resistor? It's likely it's the cathodyne bias resistor: Rb = 1.5k.

I noticed a shielded cable, white, so possibly teflon, passing under the board from the volume pot to the V2a grid. It's grounded on the side of the Normal pot.

Richard McDonald talked about this amp, and his experience with Dumble on Guitarwank 253.. It's a really cool listen: https://open.spotify.com/episode/4ZrxGkNVI078ogbQ6u9ccx?si=0e85bde680664706 Thank you. It was nice to hear of the real legacy of his friendship with McDonald. Dumble lives through h...

Okay, that didn't take long. The schematic is done. First draft anyway. If you see any errors or think it could be improved, please let me know.

Now! Who's going to bite the bullet and build it?

https://ampgarage.com/forum/viewtopic.php?f=5&t=37167

First mentioned, with photos and descriptive text: https://ampgarage.com/forum/viewtopic.php?f=4&t=37151


With circuit clarification from Charlie Wilson. Thanks Charlie!

Please comment if you see any errors.

Dr d wrote: ↑Wed Apr 17, 2024 3:29 pm So not a particularly exciting amp then?!!!

Didn't say that

Probably should clarify what is going on with the trimmer. B+ rail comes from filter to bottom terminal of 10k trimmer at the 100k and continues on to V1 off the bottom terminal. The 56k is on the wiper. I don’t know if the wiper and top terminal are jumpered but either way a variable resistance 56...

Just checked over on Rob Robinette's site and the Edge has .022uF coupling caps to the power tubes, plus 470 Ohm screen grids. I think this amp has them as well.

Colossal wrote: ↑Tue Apr 16, 2024 11:22 am This amp looks like it may have started life as an Edge signature 5E3, but that's just a guess

I thought the Edge Deluxe came out later, around 2016?

With some help from AI, we might be able to reverse the b/w filter. This is just with a free tool so I'll keep trying with others and Photoshop neural filters. Or you could go the other way and take a photo of a resistor and b/w it to see what comes close. ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯ :lol: Fifty shades of Gr...

...soft clipping on the preamp side, into beautiful, symmetrical clipping from the 6V6 power section. That suggests a warm, saturated tone in the preamp bias followed by a more symmetrical centre bias in the cathodyne. Giving it a harder, grainier, more high-gain sounding drive. The photos have a p...

Great! Let's have the description as well. Seldom does an amp arrive that causes a genuine stir across the entire vintage community. It’s been 4 long years since we last hosted a piece from the most prestigious name in the history of amplification - Howard Alexander Dumble. The inventory is few, and...

dorrisant wrote: ↑Sun Apr 14, 2024 6:11 pm Engraved and holes cut in CNC. Yes, sockets are hardwired.

Thanks! I'll have a think about that.

dorrisant wrote: ↑Sat Apr 13, 2024 10:51 pm Here's what I did...2 x octal (1 for an expansion plug) and 2 x noval (one for 12**7s, 1 for EL84s).

If anyone would like something similar, just let me know.

It looks very nice, did you engrave it by hand? Well done! Does it mean your sockets are hardwired?