Fairly common. I have seen them in Collins 51J receivers and in my RCA AR-88 receiver. They are ceramic caps often temperature compensating type. I am drawing a blank on the name of the well known maker of capacitors who made them. I don't know the history or the mechanical construction. They are high quality caps which seldom fail. You are probably aware that the characteristics of "low K" ceramic and "high K" ceramics are quite different. Low K, AKA NPO or CG0 are very reliable and do not change with age while Hi-K ceramics do age and have some undesirable characteristics like high dielectric storage and variation of capacitance with voltage and temperature. The Lo-K type are made in various grades of temperature characteristic for compensation. I just tried to find the name of the company who made a lot of these things but could not. Some ceramics were made in the dog-bone style and some as ceramic or bakelite case axial types.
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On 4/21/2022 5:42 PM, Jeff Dutky wrote:
Were the tubular "dogbone" capacitors unique to Tek, or were they a commonly available third-party component in the 60s and 70s? Does anybody have any information on how these were made? Was there a "correct" jargon for them?
-- Jeff Dutky
--
Richard Knoppow
dickburk@...
WB6KBL
