Batboard

I need info on the stage 2 device for a Micor base PA TLE1693A. Transistor is Motorola part 48-869851, type M9851, 5W in, 12W out. Any info on this part would be helpful, it seems hard to find. I was told this pa design used non-Motorola parts from a Calif. source, possibly CTC or TRW.
Thanks

Welcome to the Board,

This looks like it would be best served by purchasing an entire PA from Ebay and harvesting components.

Sadly that is still what I have to do nowadays and or find preferred replacements i.e. taking a Syntor 100 watt mobile, slicing off the PA and mounting it onto an acceptable heatsink say a retired 150 watt 800 MHz VoCom PA chassis with some additional fans

Best of luck

There is a TLE 1693 on eBay right now.

Thanks, saw that on e-bay. Bought a used board with all 3 devices. I was really interested if anyone on here had actually found current stage 2 replacement device. The output device is available as an MRF-644 or NTE-366. I have seen stage one advertised too. If I was to guess it looks like stage 2 might be replaced with MRF-641. Stage 2 and 3 use the same base and collector caps, (25.5pf), so do the MRF-641 and MFR-644 test fixtures, close anyway. I may try an MRF-641 as an experiment.






















stage I may try it for an experiment.

Got my two PA's working. The board off e-bay had different devices for stage 1 and 2, while stage 3 was the same M9741, (which I found new on e-bay, RF parts, also NTE-366). The e-bay board stage one was M9738, stage two M9739. The M9739 2nd stage device I see is available from RF parts. I used the old scrap board part M9739 and an MRF-644 to replace stages 2 and 3 on one pa. With full battery (13 Volts) on the first stage drive voltage, the pa with the original M9741 output part puts out 45 Watts, the other with the MRF-944 puts out 38 Watts. It's billed as a 25 Watt pa. I hope this helps if anyone is fixing some of these.

I lost my latest post update somehow. The spare board off e-bay had different parts for stages 1 and 2 while stage 3 retains the M9741. Stage one is M9738, while stage two is M9739 and is available from RF Parts. I did replace the output device M9741 with an MRF-644 and it does work.