Question About 5E7 Bandmaster or 5F4 Super

[4960]

Is anyone using Weber transformers in these amps? If so, do the output transformers sound good?

Thanks,
Ken

[Kap'n]

I've got the Weber transformers in mine (5E7), and think it sounds pretty damn cool.

I don't have a lot of real 5E7s to compare it too.

[4960]

Thanks Kap'n, I trust your opinion. I'm thinking about building one of these amps sometime in the future. Is 3 speakers versus 2 speakers the only difference between these two amps?

Ken

[Kap'n]

Is 3 speakers versus 2 speakers the only difference between these two amps?

Not exactly.

There's a local negative feedback loop in the preamp. The bandmaster has a 10 megohm resistor, the super has a 4.7 megohm, or twice the negative feedback. I've got the 10 in mine, but thinking of going with the lower value.

On the originals, the output transformers are different too, as I understand it.

[4960]

Thanks for the info.

Ken

[Kap'n]

Oh, also....

Don't use a 12AX7 in the first postion. It'll be pretty muddy, and the amp's volume control will be kinda useless.

Use a 5751, or better yet, a 12AY7.

[Rockin' Daddy]

NOS GE 6072/12AY7 sounds great in my Weber 5E5A. Same amp as a 5E7/5F4 except for the speakers and R34, the negetive feedback resistor feeding the PI. Same local feedback as the 5F4.
I have a Weber W404248 in a homebrew 3X10 5E3. That amp has had an MM 2.6 ohm Bandmaster tranny in it. The MM has some qualities that the Weber doesn't but I actually like the Weber better.

[4960]

Appreciate the tube information. What speakers are ya'll using in your amps.

Ken

[TT100]

Rockin'Daddy, I found that a NOS JAN GE 6072 in V1 was excellent in my 5e3x2 "Double Deluxe" too. Very sweet tube.

TT

[Kap'n]

I'm using Weber 10A125's in my 5E7.

The 12AY7 is a Tung Sol I bought cheaply out the back door of New Sensor fifteen years ago, because I knew I would need it someday.

It hasn't disappointed.