[ARC5] Ceramic Versus Phenolic

[Richard Knoppow]

    I am not sure how rare the components of ceramic were.  Ceramic has 
much lower losses at RF so is used where low loss is important even at 
HF as in the RCA AR-88 receiver.  There is lower loss phenolic such as 
mica filled Bakelite. Ceramic still has lower losses plus absorbs less 
moisture, has higher insulation resistance and has greater heat 
resistance. Mica was definitely in short supply during WW-2. Low loss 
mica filled phenolic was used for many tube bases, usually indicated by 
a Y in the type number. Ceramic was used mainly in higher power tubes 
where heat resistance was important. I think cost may have also been a 
factor since both ceramic insulators and low loss phenolic are fairly 
rare in post war equipment.

On 1/11/2016 5:36 PM, Bruce Long via ARC5 wrote:
> I actually know nothing about WW2 ARC receiver production however I 
> think I know the American Defense industry in WW2 was tightly 
> rationalized and I would suspect ceramic tube sockets where too 
> expensive and labor intensive to allow their use in equipment unless 
> strictly required.
>
> Post war VHF equipment would have fewer production bottle neck 
> problems and ceramic I supose would be noticably less lossy at VHF 
> even without considering the hydrophillic tendencies of phenolic.
>
>
>
> ------------------------------------------------------------------------
> *From:* Phillip Carpenter <carpenterpa at tds.net>
> *To:* "gewhite at crosslink.net" <gewhite at crosslink.net>
> *Cc:* "arc5 at mailman.qth.net" <arc5 at mailman.qth.net>; Robert Eleazer 
> <releazer at earthlink.net>
> *Sent:* Monday, January 11, 2016 8:03 PM
> *Subject:* Re: [ARC5] Ceramic Versus Phenolic
>
> All of my ARC Type 12 receivers (post WWII) have ceramic sockets. All 
> my ARC-5 receivers have phenolic sockets.
>
> They must have not been too worried about moisture absorption at high 
> altitudes during WWII.
>
> Phillip
>
> Sent from my iPhone
>
> On Jan 11, 2016, at 7:39 PM, gordon white <gewhite at crosslink.net 
> <mailto:gewhite at crosslink.net>> wrote:
>
> A.R.C. used ceramic sockets in the later equipment, most of which was vhf
>
>  - Gordon White
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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