Unknown 1600:1 [6400 Ohms] 32653 Vintage Output Transformer OT Potted Tested 815:1 165:1 HUGE 5 lb Tube Amp Audio

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 . No IEA date code found. Weighs 5 lbs 0 oz. Center-to-center bolt spacing is 96 mm, and height of casing is 109 mm. Quantity sometimes available - please enquire.

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 40:1, leading to an impedance ratio for the main secondary coil of 1600:1. This winding of the transformer would provide a 6400 ohm load resistance to the tube plate if you hook it to a 4 ohm speaker.

This model has multiple secondary taps. Additional impedance ratios of 815:1 (via the black-white connections), and 165:1 (via the black-orange connections) are available as options.

Lots of other secondary taps, as shown.


Serial number O-1027.