The Amp Garage

The quality of your workmanship is just awesome. Everything about the build is fabulous.

In the photo above (first post), is the jack plugged in to SPK1? It looks like it might be a stereo jack, wired to short the tip to the ground when the jack is in (black wires) - if I understood the photo correctly it would be good to correct that. Edited to add: perhaps it was intended to be a swit...

Are you sure it was the amp?

This is a good guide on biasing
https://robrobinette.com/How_to_Bias_a_Tube_Amp.htm

This looks like it might be a 124 build thread using the AN boards.

I've always cut my FR4 using a track saw.

This popped up on my feed. Sadly no gut shots

https://guitarhunter.dk/product/1979-du ... 100-combo/

Which country do you live in?

Thanks

As it happens I did use UF diodes, out of coincidence. These have 2 diodes is series, and the PT is a Hammond 290FEX with 640VCT @518mA so I guess(?) 440V B+. I’ll leave these off then.

Ok Martin - I’ll come back to that and we can see about your slab later.

I see on Erwin’s PCB labelling, 10nF 630V for the rectifier diode suppression caps. The ones I bought from TubeTown are 305V. Will they do please?
I don’t know enough about voltage spikes they may see.

Thanks Martin

Perhaps a daft question… you don’t use 100R balancing resistors when elevating the heaters?

Thanks Ryan. I’ll get the next batch of stuff ordered.

Found some time to build and have some questions I'd appreciate any thoughts on (thank you in advance) Switches assembled first on a cardboard strip, to make it easier IMG_8857 (1).jpeg Boards mounted with the bits I have to hand; some sourced from a bag of donor parts so I don't know the origin. IM...

What did you do with the abandoned Erwin chassis please? If it is to be for sale I may be interested (also in EU).

Yup. Personally I prefer the "baffle" closer to the front, but I think it's just to taste. Keep an eye on clearing the distance to the metal corners if you do bring it forward. Here are photos of one of mine - the metal is 20mm wide, baffle 18mm + grill cloth, and I ran the metal strip flush with th...