General Transformer C-20933 GTC335-0-335 / 6.3 / 12.6 V Ampex Vintage Power Transformer Tested Tube Amp Project 6X4 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. No IEA date code found. Weighs 2 lbs 12 oz. Bolt spacings 52 mm by 48 mm. Quantity sometimes available - please enquire.

This transformer originally provided B+ and heater supply for these tubes: 4 12AX7, 2 12AU7, 6X4

Please see the image of the original schematic for a full list of HV and low voltages available!

Here are the verified connections for this transformer:

Input: 117V

Outputs:
670 VAC center tapped
6.3 VAC
Two total 6.3 VAC outputs!
12.6 VAC

Grey is 25.2 VCT

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 use as an isolation transformer or tubes with series heaters, purple 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-1063.