Original RCA transformers from an early period 76 series console, currently on some home made preamp modules with custom circuit that came out of a heavily modified 76. These are the earliest versions of the correct parts for BA-1A, BA-2A/B/C, 85-B (the circuit in the 76 console), and several other more obscure RCA types. You only see the orientation indention on top on the earlier versions. These all ohm out correctly. The existing circuit is shown for curiosities sake, and has not been tested, in fact some of the input wiring has been cut loose from the input transformers. You could, in fact, keep the ‘one bottle’ 6SN7 and convert the existing module to the BA-2 circuit.
Four total in the pictures, I have one module/set left. All gone!
$300/ (module with in and out) plus shipping/insurance on 4lbs.
$300/ (module with in and out) plus shipping/insurance on 4lbs.
