Woodward Schumacher 540:1 [4300 Ohms] Wollensak Revere 3M 131-22 Vintage Output Transformer OT Tested Tube Amp Audio 1953-1964

One (1) fully 1.00 kHz AC tested and guaranteed vintage tube amp output transformer. AC testing using an oscilloscope allows us to find and reject transformers with noisy outputs, which a simple resistance or continuity test will not reveal. Made in USA in 1953-1964 by Woodward-Schumacher for Wollensak Revere 3M. IEA date code may vary, since this is a bulk listing of the OEM specification. Please offer $2 extra if you'd like us to poke through inventory to select a certain manufacturer or year. Otherwise, we'll grab the first one on the shelf. A typical IEA code for this model is 606348. Weighs 0 lbs 12 oz. Center-to-center bolt spacing is 60 mm, and height of casing is 41 mm. Quantity sometimes available - please enquire.
This transformer was originally used to connect a 6T9 output tube to a speaker.

Using a 10V_pp, 1.00 kHz input to the primary coil, we have verified these connections for this vintage transformer:

The turns ratio (pri:sec) is 23:1, leading to an impedance ratio for the main secondary coil of 540:1. This winding of the transformer would provide a 4300 ohm load resistance to the tube plate if you hook it to an 8 Ohm speaker. n 8 ohm speaker.


SKU O-Wo22.