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In Reply to: RE: I want to make an EICO HF81 or Rogers clone, sans preamp posted by SteveSchecter on August 14, 2017 at 05:38:03
This should be the ticket, at least for using the 3 tube front end. 12ax7 AF amp to 6C4 splitter. The voltages are just right too. I got bunches of 6c4 that i never use. Thanks Steve, for pointing me in the right direction. At the least i have something to shoot at.
Edits: 08/14/17Follow Ups:
You have a "Catch 22" to deal with. The 7 pin mini socket used by 6C4s will not directly fit in the chassis holes used by 9 pin mini sockets. You will have to fabricate "hole shrinkers". Cut rhombic shaped pieces of sheet metal whose long axis accommodates the 9 pin socket's mounting centers. The short axis accommodates the 7 pin socket's mounting centers. "Break" the sharp sheet metal corners, to avoid injury.
Eli D.
My memory was that it was a 9 pin base, but that proved wrong. I checked the holes and like you said i would have to fabricate the plates to hold the smaller tube socket. Too bad.
I am thinking of just using 1/2 of an au7 of the tube per channel. I got lots of them so no big woof. I got the power supply sorted so almost half way to the finish line. As appearances go, i have the chassis painted light blue hammertone and the trannys are painted black. thanks for the suggestions. Dak
Wire the 'U7s asymmetrically, so that 1 channel uses system 1 and the 2nd channel uses system 2. When the tubes show signs of wear, flip/flop them.
Eli D.
Great idea. I was just going to wire them so that the plate closest to the el84 would be used. But i can see if that would work. Thanks for the tip!
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