Dr Z Remedy

[Blackburn]

Cin Tran does trannies for Z.

[M Fowler]

Not sure but it is a lot like my Swamper amp which I based off a 5f6a (JTM45) but with MV no presence pot. Has single input a high pot and low pot to blend the two triodes. A sweet sounding amp.

Mark

[randalp3000]

I have one at work, I wish I had time to take a peak.
I also had one personally for awhile and the half power did sound better than any others I've encountered.
I wonder if it has separate taps on the OP trans or if it switches the secondaries while dropping two tubes. Or maybe with the B+ like on the tiny terrors. If I get a chance I'll take a look.

[pdf64]

See http://www.drzamps.com/Documents/DrZTQRDec11_Web.pdf page 5.
He describes the 4 x 6V6 as sharing 2 bias resistors (must be as p-p pairs!) so that one pair can be switched off to halve power.
And the OT primary is somewhere between 4k and 2k so as to get a reasonable match in 2 or 4 6V6 mode.
A heavily overdriven 5E3 sounds quite Marshally to me!
Randal - can you see if the Remedy has a choke?

Warren, my guess is that a 50 watt hifi output transformer with a 3k3 primary, eg Hammond 1650KA, may be a reasonable approximation.

I would tend to keep the VB+ on the low side, eg below 400V, maybe ~360-380, such that the 6V6 run close to class A, in order operate without global negative feedback; gives you the option to try it both ways.
Too high VB+ and cathode bias needs to use higher value bias resistors which results in excessive crossover distortion when overdriven.
Crossover distortion in cathode bias has a thin reedy tone, to my ears.
Pete

[M Fowler]

From the EU site.

Okay pictures are down now.

[randalp3000]

OK I think I have it.

amp is still in production so I left values out, sorry.

So how would this setup be better than just lifting one set of cathodes?

edit, yeah one of the cathode caps is backwards. oops