[Milsurplus] DAV output transformer

[Ray Fantini]

Ok, so I have a DAV transceiver on the bench that appears to have a failed primary on the audio output transformer. The secondary is good but the primary has gone open. Its in the plate side of a 3S4 and has a +135 volt buss that feeds it. Use to work but now its dead. The big issue is that the transformer is in a sealed metal can (T101A) that also has the modulation reactor and the microphone input transformer.
Anyone have any experience dealing with opening up the can and what's inside? Options at this time include installing a new transformer somewhere else in the radio, installing a plate load resistor and a decoupling capacitor and using high impedance headphones or perhaps getting rid of the 3S4 completely and building a solid state output amplifier around something like a 741 op amp and using that to drive the headphones?
That transformer can has a flock of wires that go in and out that none are going to be easy to deal with. Wonder if the can may be disassembled on the chassis without having to deal with all the other stuff for the modulator? Another option would be finding the radio section from another DAV or MAB transceiver and moving the crystals and tubes to that. Before anyone says anything I know there are some differences between the MAB and the DAV but converting a MAB to a DAV is just addition of a couple parts right on top the chassis and way easier then this output transformer problem.
Any suggestions welcome.

Ray F/KA3EKH


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20180325/4878177d/attachment.html>