[GreenKeys] OT: Non-TTY Cap Identification

[Ralph Mowery]

They are just the plain electrolytic.   Replace all of them at the same 
time.  You may have a hard time finding the capacitors with a very high 
voltage rating that the leads come out of each end.  Most likely you will 
have to find some of equal or greater voltage and the same capacitance with 
the leads comming out of the same end.  I never can get the radial and axial 
terms for the leads to stick in my head.   Be sure the positive or + end is 
connected the same way.
Also capacitors may have a temperature rating for them.  Most either 85 or 
105 deg C.  Try to find some with the higher rating if you can. Just don't 
go lower.
Usually the newer 'computer' grade capacitors are much smaller.  Sometimes 
people will gut the old capacitors and install the newer smaller one inside 
the case.  This is to keep the looks origional and not for the function.


----- Original Message ----- 
From: "Cory Heisterkamp" <coryheisterkamp at gmail.com>
To: "greenkeys" <greenkeys at mailman.qth.net>
Sent: Thursday, April 02, 2015 12:48 PM
Subject: [GreenKeys] OT: Non-TTY Cap Identification


> Sorry for the OT chatter, but if anyone has some advice to share, it'd
> be this group. I'm trying to identify what type of capacitors these
> are in the attached picture link so I can perform a replacement. The
> values are 40uF each at several hundred volts. In small print on one
> end is polarity identification with the word 'Positive" but no
> tell-tale signs or construction that I would expect from a
> conventional electrolytic. The associated rheostats are used in
> setting the current to a pair of QK-707 magnetrons in a 1963 Raytheon
> Radarange and I don't see any associated rectification which leads me
> to believe this is an AC circuit. (there's one selenium for a
> disassociated relay, and the heavy stuff is by way of 866A rectifiers)
>
> http://www.radar58.com/misc/caps.jpg
>
> Any ideas guys?