Dynaco 440 Transformer Cathode/Screen Taps 6P1P 6AQ5 UL transformer

[MikeV]

>>>I’m interested in getting Edcor to make an opt for 6P1P/-EV and 6AQ5<<<

So what's the consensus? Does Edcor have a transformer ready to go for my PP 6P1P's (or 7C5's) ??

Should I look at the GXPP's like this one GXPP15-8-10K

what about Ken's suggestion for the 10 watt CX model?

or should we lobby for a custom wound like the OP suggests?

thanks for your input!

[Miles Prower]

I'd say fuggeddabouddit. PP 6AQ5s sound pretty good running open loop. This type doesn't make nasty higher order harmonics that require the extra help of local NFB. Types like the 807, 6L6, other 807-oids, make more higher order harmonics, and so need local NFB to get them sounding good.

Just use the 6AQ5 normally, preferably with a regulated, Lo-Z, screen supply, and add just enough gNFB to take the edginess off.

[7n7is]

Transformers having cathode windings have been used in some McIntosh amplifiers and Hammond PR40's. I bid on a couple Hammond PR40 amps on Ebay, but haven't won any auctions. I was thinking of converting one of them into a stereo tube amp.

Audio Tube Amp Schematics

http://www.captain-foldback.com/Hamm...R40_QR40_1.gif

[7n7is]

This looks interesting.
A Kenneth Olson 100W Audio amp

[ppl]

I have a Push pull Ultra linear output stage with cathode feedback using the Hammond 1650 series of output transformers. if you use these connected up for 16 ohms and ground the center tap you will get balanced AC voltages from ground to ether winding end that is connected to the cathode. Works well