Can someone tell me what an "A 2920" transformer is or who manufactured it? It is supposed to be an audio (inner stage) transformer in a modulator. Darrell, I have a 1961 catalog showing a MERIT A-2920 as a driver transformer for such tubes as a 6C5, 1H4, 30, 49 etc. It has a primary to secondary of 2.5:1 and the primary has a 10 ma rating. 73, Ken W2DTC