Tube Amp Archive

I’d be looking at saving some real estate rather than money by sharing the V1 cathode. Also, it would be more simplistic and true to the original. And, I have a tendency to build amps with too many switches and modes, this would be a more straightforward and clean build. :D Any opinions on the B+ fi...

If not cascaded, how will you connect them? Hmm… Channel 1 uses V1a, has its own plate resistor and coupling cap, vol knob connects to one side of PI. Channel 2 uses V1b (and V2) with its own plate resistor etc. Channel 2’s treble pot connects to the other side of the PI. Just like the Vox amps of ...

sluckey wrote: ↑Sat Sep 04, 2021 12:00 pm

tomandrew wrote: ↑Sat Sep 04, 2021 10:50 am I’m thinking shared cathode for V1a/V1b.

That's a bad idea if V1a/V1b will be cascaded. Risk of positive feedback. Spend another dollar.

Noted!
I don’t see myself cascading them; I’d probably only use Channel 1 if using an external preamp, but I’ll take your advice into consideration.
Thanks!

Amongst my American and British styled one-channel and multichannel builds there’s one thing missing: a Vox style EL84 amp. (Well… apart from that Weber 18W TMB thing that’s eating fuses…) Since Vib/Trem isn’t my thing I’m planning on using an 18W chassis, but adding another couple of power tubes an...

I remember looking all over the place for a schematic of the C*ncorde. I found thread on another forum regarding the changes, K*met -> C*ncorde. Do a google search for komet concorde cathode follower and you'll find a thread called 'CF-driven phase inverter?' that describes the circuit changes aroun...

bnwitt wrote:Here are a couple of voltage charts

Thanks!!

Hi guys, Been lurking around this forum for some time now. It's a nice place! :D I've built something that looks to be a bit inspired by a K*met. Tried to convert it towards C*ncorde-ish specs but didn't like the sounds I got. I'm thinking my voltages are way off spec... My B+ is about 500V right no...