Philips Norelco 1110:1 [8900 Ohms] 061 WT 511 22 Vintage Output Transformer OT Tested HUGE 2 lb Tube Amp Audio

Transformer purchased on Reverb from US. The condition is great but I couldn´t use it for the project it was intended for. Transformer was originally sold as fully 1.00 kHz AC tested and guaranteed vintage tube amp output transformer. I have replaced the original cables on transformer secondary.

AC testing using an oscilloscope. Made in USA in by Philips Norelco. No IEA date code found. Weighs 2 lbs 2 oz.

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 33:1, leading to an impedance ratio for the main secondary coil of 1110:1. This winding of the transformer would provide a 8900 ohm load resistance to the tube plate if you hook it to an 8 ohm speaker.

Using bottom blue-bare as primary results in slightly smaller ratio. Using red-bare as primary makes ratio 11x bigger! Yellow appears to be isolated from both windings.