[ARC5] Trimmer Cap Values

[Geoff]

That is a real oldie cap! The M series became the 160 series sometime in the 
50's.

The first number is the maximum C but Ive no idea what the 8 stands for as 
the minimum C on that series is 1.5 to 3 pf.
If it has a total of 21 plates it is 3-20pf (rounded off) and the later 
160-110.

I use the much smaller 189 and 193 series for most replacements in RX and TX 
VFO's

Carl




----- Original Message ----- 
From: "Robert Eleazer" <releazer at earthlink.net>
To: <arc5 at mailman.qth.net>
Sent: Saturday, April 12, 2014 1:17 PM
Subject: [ARC5] Trimmer Cap Values


> Do any of y'all know if there is some kind of a code or other marking that 
> gives the values of trimmer caps? For example, if one made by Johnson says 
> "20M8" could that be 8 to 20 pf?
>
> I just busted a 1.5 to 20 pf trim cap whole working on a National NC-270 
> and I need to replace it.  I recall hearing that small air variables give 
> better stability than do the compression type like the one I broke.  I 
> have some of such caps but for at least some of them I have no idea of the 
> value.
>
> I like the idea of using air variables instead of compression padders in 
> any case because you can actually see what they are doing and they would 
> seem to be far less vulnerable to getting filled with rust and dirt.
>
> Thanks,
>
> Wayne
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