Pre-Amp Build

Wntrmute2

Junior Member
I forgot to add the schematic. This is courtesy of Paul B.
My plan is to try a hybrid rectifier with a 5R4 tube and to replace the one OD3 with two OA3s for the same voltage drop.
Boy I hate Styrofoam packing peanuts!
preamp (2).jpg
 
I forgot to add the schematic. This is courtesy of Paul B.
My plan is to try a hybrid rectifier with a 5R4 tube and to replace the one OD3 with two OA3s for the same voltage drop.
Boy I hate Styrofoam packing peanuts!
View attachment 27026
Really looking forward to your build Dave. I have a Pete millett low-mu preamp that I can't seem to get the hum out of. My frustration level is making me think I should build a different pre.

You might have heard my millett pre over at Ed's in Rochester hills.
 

Wntrmute2

Junior Member
The two 2C22s are supposed to replace the two 6SN7s since they are 1/2 of a 6SN7 I believe.

Something like below. Obviously, it Annotation 2020-09-03 160730.png
needs a lot of work. The attenuators are only available in 50K and I'm unsure if I have the diodes and 5R4 hooked up correctly. The transformer has a center tap for the HV windings.
 

Wntrmute2

Junior Member
What kind of resistors for cathodes to grounds? I thought non-inductive wire wound but they seem to be harder to find than I remember.
 
Ok, so 76 in back and 2D22 in front? So you're switching between the two not running the signal through the 2?
 
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