In article , Bruce Esquibel
wrote:

Was wondering if anyone had any info on a transformer marked:

Thordarson
T-62911
238-9720

I'm 99% sure it's a tube output transformer, but it's not being used for
that application.

Bruce-

My memory is quite dim from working with Thordarson transformers many
years ago, but I think your analysis of the part number is correct. It
doesn't sound like the numbers I remember.

I believe it is a proprietary in-house number supplied by the company it
was made for. The best you can do may be to contact the equipment
manufacturer and ask them for data. If there is a Sam's Photofact
published for the equipment, it might have additional part number
cross-reference data.

If you want to make this a learning experience, you could analyze the
transformer yourself. Using an audio oscillator at one KHz, apply a
voltage to one winding and measure voltage on the other windings. Turns
ratio is equal to voltage ratio. For an actual turns count, you might
snake several turns of fine enameled wire around the existing windings,
and include the known number of turns in your ratio calculations.

For frequency response, load one winding with a resistor and measure input
impedance and output voltage as a function of frequency. For power
handling, you might insert a current-sampling resistor and observe voltage
vs. current on a scope. For your choice of minimum frequency, current
will peak considerably when you increase voltage above a critical level,
as the core saturates.

Good luck!

Fred