This is the Modulator Driver Transformer from a Gates/Harris BC-5P AM Transmitter. It was driven by a quad (4) EL34 or 6550 power tubes and in turn drove the grids of a pair of 3CX2500F3 ceramic power tubes.
Transformer T-204, Mfg. for Gates # 478-0054-000 by Electro Engineering Works.
This has an ultralinear/screen tapped primary and two independent secondaries.
The transformer has been bench tested using a pair of 6550s
running 420V PP and terminating each secondary with a 1.5K ohm resistor.
I roughly measured near 200v pp across each resistor at clip and measured a great frequency response of +/- 1db 30cy to 15kc or better. I was pretty much at the limit of the scope input with a 10X probe and variable turned back.
Both windings were perfectly matched at all frequencies.
This would make a good driver for just about any big bottle modulator pair.
The case is in perfect condition with only a few small paint chips. Mounting bolts are clean and straight as are all the terminals.
This is epoxy potted.
Measurements are 4-3/4 high 3-1/8 deep and 3-1/2 wide.
I would like $75.00 plus shipping for this fine piece of Iron. PayPal preferred but will accept a personal check or Postal M.O.
Pix available on request. Please use the Forum reply or my e-mail
doxemf@aol.com Shipping will be via Parcel Post or Priority Mail for 9-1/2 lbs well packed weight. Final shipping method will be determined by what is most cost effective to your location.
