This is going to be a long shot but figured I'd give it a shot.

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.

Am curious if it was a custom job or something off the shelf they used to
sell (Thordarson seems to have flown the coop a couple years ago).

I remember in the 70's and 80's a few places like Olson Electronics in Ohio
and EDI in Chicago once in a while printed lists of transformers (probably
from the manufacturer data books) in the monthly fliers or annual catalogs.
Could of been Stancor for all I know.

This thing isn't that old, probably mid 90's, been looking around the web
and ebay but most data seems to be for antique stuff. One catalog I found
from 1980 or so, doesn't even list a "T-" series in it (mostly two numbers,
a letter, more numbers).

Although I'd love to get my hands on a pair of them, any specs for it would
be really appreicated.

thanks,

-bruce

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

Fred McKenzie wrote:

: 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.

Yeah, you hit it on the head.

Just as a follow up for future archives, there does seem to be a pulse left
at Thordarson, one email address I ran across (xformers at aol dot com) was
valid and they responded back. Not really sure what they are up to, there
was a one-liner that said they moved from Chicago to southern Illinois.

Anyway, they did have the info on the transformer on file, was custom built
for the company who made the thing I'm tinkering with, but they can't sell
replacements because of that.

They were able to provide some technical info on the specific transformer
which between that and a few measurements from the working one should be
able to qualify suitable replacements.

-bruce