5E4-Mission Amp TX's

[clyde1]

Anyone built one? I have a set of transformers from Bruce that I'm hoping to
use in this build. Any pointers?

[TD_Madden]

I've never seen a 5E4 schematic.....where did you find one??

[clyde1]

It's the same as the 5E4-A save for one lonely resistor in the bias supply changed from 22K to 18K.

[TD_Madden]

Never seen one of those 6V6-based Supers.....wonder what the tone is like...

I surely do like my Mission 5F4, though!

[clyde1]

I never have either. I'm still kicking around whether to go fixed or cathode-biased and which PI to use as well as mulling a CF-driven tone stack. I guess I'd have a 5F6A front end with a 6V6 output, sort of. I was just wondering if the Mission PT supports the extra 12AX7. 5F4 sounds cool too.

[Bruce / Mission Amps]

Which power and output tranny are you planning on using?
The 6V6s set, or the 6L6 set?

[clyde1]

Invoice says MA 20W 5E3 PT and 15W OPT-safe w/3 12AX7's Bruce?

[Bruce / Mission Amps]

Yes, an extra 12AX7 will be nearly invisible to the PT and, you can run a pair of 5881s with that 15W OT if you keep the idle current down to 32-36ma for each tube.
The OT is under rated at 15 watts from 40Hz to 7.5KHz. It can easily handle +22 watts at most guitar freqs.

I use the same MA 20W PT in a lightly loaded 6L6 amp with four 12AX7s and an OT about the size of a Pro Reverb.
Never had a problem with that set up yet.

[clyde1]

Thanks Bruce, I wasn't too worried, pretty stout iron, surprised that little OT can handle 5881's, cool.