Philips Norelco WT 51094.0 60 Transformer 245-0-245 / 6.3 V Vintage Power EL3515 schematic 220V option Tested Tube Amp Project 1960s

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 1960s for Philips Norelco. No IEA date code found. Weighs 2 lbs 9 oz. Bolt spacings 70 mm by 56 mm. Quantity sometimes available - please enquire.

This transformer originally provided B+ and heater supply for these tubes: EZ80 ECC83 EF86 ECL82 EM84 magic eye

Here are the verified connections for this transformer:

Input: 117V

Outputs:
490 VAC center tapped
6.3 VAC center tapped

HV is pins 1 and 7, heater is pins 4 and 5. Black wire off transformer is CT for HV and 6.3V. See attached schematic for more details. Lots of input voltage options.

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-1221.