Tube Amp Archive

So, based on the recommendation of engineers at Eminence, I ended up trying a Eminence Tomo Fujita 12" (TF-1250). It's a very clean, bright speaker with tight low end. What was a dark 5F1 circuit is brightened up substantially. Humbuckers sound good. The amp breaks up around 7ish (6v6/5Y3) and 10ish...

Re:chassis. Indeed, this build deserves bigger but it was a kit from BYOC that was on sale at the time so I grabbed it. As I commenced the build, my imagination took over and I started adding extra features. I ended up with a 3-way bright switch, 3-way NFB switch and 3-way boost switch. I'll have to...

Yeah, I agree. I feel like I've paid my dues with building a couple of these now. Working inside such a small chassis is a tight operation. I would enjoy more real estate to work with next time, Otherwise, I'm contemplating the removal of the standby switch to just a basic on/off. From what I've rea...

Attached are a few gut shots. Try not to laugh at my PTP bias/capacitor arrangement! This is just to get everything working. I suppose a small auxiliary turret board mounted on the side wall would probably be a more permanent solution considering the vibration in a combo. I'll try to get some audio ...

Just finished the build the other day. Thanks for all of your help pompeiisneaks. First off, the amp idles very quiet. Any hiss is barely detectable. Much quieter than the last 5f1 I built. I played it through a 12" sealed pine extension cab with a an Eminence Red White & Blue. I find this speaker t...

Thank you for digging that photo out. I wasn't sure what to make of the schematic because there are a few ways to secure a ground from there. Run a bus wire, go underneath with a insulated wire, etc. Given that the transformer wires are grounded on the left side lugs, and the filter cap bus wire is ...

Phil,
Thank you for the speedy reply and helpful info!
I have not been able or source the Sprague 20uf 450vdc but was able to find some F&T 22uf 500vdc from Hoffman amps.
Hopefully, these will be sufficient for now.

Also, I'm trying to find where R8 (4th turret, 270k resistor) is grounded. Any ideas?

Hello all, I recently built a BYOC 15watt 5F1 Champ 6L6 and housed it into a Deluxe pine cab w/a 12" WGS G12 C/S for a friend. What an absolute beast! So, for my next build, I'm collecting parts for the Tweedle Dee Champ circuit but with the 15watt/6L6 option. The Tweedle Dee Champ uses 20uf/20uf/20...