>
>>
>> >
>> // Not all oil-filled capacitors in days of yore used PCBs. General
>> Electric's "Pyranol" caps did. Sprague "Vitamin Q" caps did not. Also,
> [Steve Katz] The T-bolt, at least the one I had 1969-1975 or so,
>had a Pyranol cap. It not only failed, it leaked all over the operating
>bench; but where it was installed it must have run awfully hot, it was under
>the chassis with no air ventilation at all. I wore two sets of rubber
>gloves and used a lot of paper towels to wipe up the mess...the oil was
>nearly clear but very sticky.
>
>> capacitor ratings then tended to be conservative. For example, a
>> "Vitamin-Q", 600v-rated, 4uF capacitor fails at c. 3500v. I ran some at
>> 1700v for years in a UHF amplifier and they are still good.
> [Steve Katz] Since Fair Radio has modern vintage HV oil-filled caps
>with mounting brackets for ~$1 per uFd, can't see the point in using old
>caps or pushing them hard!
>
// Agree, however modern electrolytics would reduce the burdensome
weight and provide more C. Also, discarding the filter choke would help
too - and it would add some sorely needed - for SSB - anode volts.
cheers, Steve.
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|