Here's an old trick I have used to "repair" sticking vacuum relays in
airborne military and government equipment for the past 30+ years.
Although prescribed as "temporary repair", I have found it to be
"long-term" repair in a majority of cases. There will be some relays that
just can't be "repaired" in this fashion.
SIMPLY REVERSE THE WIRING TO THE RELAY!
In Ten-Tec amplifiers the relay coil transient protection diode is
physically placed across the relay coil terminals, so you will have to
reverse the diode as well.
I have had a Ten-Tec Titan-I amp for approximately 5 years and it developed
the sticking relay symptom about a year ago. I performed the above surgery
immediately and it is still performing flawlessly after an estimated
half-million or more cycles.
73, Dave, K1FK
Fort Kent, ME
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