Regarding the quest to keep a 5065A running...
The 5065 in my hobby corner was equipped with the firstversion of the AC-Amplifier (A7) that did not have a frequency selective 2nd harmonic detector. So I copied the later design but made possible the use of selected polyester precision audio capacitors for the resonant parts and also replaced the 709's not with 741's but OP07. That design was uploaded to KO4BB (Complete with layout and gerber /NC-data should anyone want to copy it.) I have not received any comments but it works really fine. The Rb cavity was equipped with a thermal breaker recommended by Corby D. The linear power supply was replaced with a switched 24V unit (with DC filtering!) and the instrument now runs pretty cool. The only heat I can feel with my hands are just right above the Rb cavity. I wonder how many 5065A's that are in professional use today. Or if all have been salvaged by time-nuts... Ulf KylenfallSM6GXV _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.