Hinchley S39 Transformer 680 / 6.3 / 5 / 12.6 V Telequipment Vintage Power Tested HUGE 6 lb Tube Amp Project 1950s

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 1950s by Hinchley for Telequipment. No IEA date code found. Weighs 6 lbs 1 oz. Bolt spacings 70 mm by 58 mm. Quantity sometimes available - please enquire.

Here are the verified connections for this transformer:

Input: 117V

Outputs:
680 VAC
6.3 VAC
5 VAC
12.6 VAC
117 VAC, for use as isolation transformer [note: our tests have NOT confirmed that these windings are isolated from the black winding!], for 220V supply, or for series tube heaters

Tons of connection options for input voltage and also HV! See photos.

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-1210.