Woodward Schumacher 54-105 Transformer 380-0-380 / 6.3 V Heathkit Vintage Power IO-10 Tested Tube Amp Project 1958

Fully 60 Hz AC tested and guaranteed vintage tube preamp transformer. AC testing using an oscilloscope allows us to find and reject transformers with noisy or lossy outputs, which a simple resistance or continuity test will not reveal. Our testing also ensures that you have access to the wires and that they are bundled sensibly, eliminating the "discovery phase" (see below!). Made in USA in 1958 by Woodward-Schumacher for Heathkit. IEA date code 606844. Weighs 4 lbs 10 oz. Bolt spacings 64 mm by 63 mm. Quantity sometimes available - please enquire.

This transformer originally provided B+ and heater supply for these tubes: 2 12AU7, 12AT7, 12BH7

Here are the verified connections for this transformer:

Input: 117V

Outputs:
760 VAC center tapped
6.3 VAC center tapped
Two total 6.3 VAC outputs!

130V on blue pair. 0.5VAC on orange pair, which is 500V from one red wire, 1200V from the other, and 450 V from the center tap yellow/red.

We use a standardized wire identification scheme featuring bright cable ties. In case of any ambiguity, 117V input will be wrapped with a black cable tie, red is high-voltage, yellow is 5V for rectifier, green is 6.3V, blue is 12.6V, white is 117V out for 220V input or tubes with series heaters, purple or grey is a second (or third!) 6.3V output. The voltages run a bit higher when run at modern AC levels instead of the 117 VAC that was specified in the 1950s and 1960s. Serial number T-1120.