5F2A But More Wattage?

[UnlikeKurt]

Hello Everyone.

I have a 5F2A and the tone is truly amazing. I'd really like to capture this tone but in a louder amp that can be used in a live setting without being mic'd up, but also without adding any additional channels or tone circuitry. What would be necessary to recreate this circuit but instead of 5 watts, something like 25 or 40?

Would it be as simple as a beefier output transformer, another power tube (2 6V6?), and a power transformer that can supply the extra current for the added tube?

Thanks
James

[MWJB]

No it wouldn't. Unfortunately, tubes in SE only develop around a half of their potential output in that mode, so even 2x6V6 is only going to get you 10-12W of useable power. For 2x6V6 in Push-Pull, you will need to go fixed bias to get anything like 25W, 40W? You're going to need 4x6V6, or 2x6L6.

6L6 usually benefit from a more complex tone stack than a tone pot, like on the 5F2A, because you need to shelve some low end...can be done with careful voicing though.

What you are essentially describing though is a "Double Deluxe" pioneered by Victoria Amps - a 5E3 Deluxe preamp mated to a 4x6V6 cathode biased, PP, output...the 5F2A has a NFB loop, whereas the 5E3 does not, easily modded/reversed. The volume & tone pots will need to be rewired like a 6G3 Deluxe, because the 5F2A volume pots are wired differently to the 5E3. Double Deluxes are usually rated around 35W +/-...

Or, if you have room for an extra output socket on the 5F2A, you can wire up a "line out" by running a 2.2K resistor from the hot speaker tab to a non-switching 1/4" socket hot tab, then bridge the hot & ground tabs of the line out socket with a 470ohm resistor if you have a 4W output, or a 270ohm resistor for an 8ohm output. The line out socket ground tab will need to be connected to the main speaker ground. Then feed the line out into a bigger amp or PA.

[Mark Hammer]

Consider this: Angela Super Single-Ended 6V6 Guitar Amp Project

[loudthud]

There's a thread in the Theory and Design section on this subject. If you want to stick with 6V6s, it will take 5 to get 25 watts and 8 for 40 W. For transformers, you are most likely looking at custom wound units.

[pdf64]

See Southbay amps
Southbay Ampworks Amp Specifications
4 x parallel 6V6 with 2x12" speakers, as per their 'Major Crunch', should get you a gigworthy amp.
If you get in touch, he may sell you the transformer set or even complete kit of parts.