[AMPS] Thunderbolt questions

[Steve Katz]

>  
> >
> //   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!

> cheers, Steve.  Tnx
> 
> -  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
> end

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