[Amps] Inexpensive variable air cap for amps

[Hsu]

Robert,
  I'm doing this now, the film is easy to insert,it should enough larger cover all  cap's  plates,   if not ,the film will corrugation when we roate the cap.I have insert some.I think the main problem is the plate's edge too close the  shaft.
 very easy arc. Maybe I must cut a bit.I'll test in  my next project: 4CX1000A portable amps(without HV trasformer).
    73! Hsu
      
----- Original Message ----- 
From: "Robert B. Bonner" <rbonner at qro.com>
To: "'Hsu'" <Jbenson at sohu.com>; <amps at contesting.com>
Sent: Wednesday, September 06, 2006 12:36 AM
Subject: RE: [Amps] Inexpensive variable air cap for amps


> Yes the place you cannot insert the film is the plate to shaft spacing and
> that's where it will arc next.
> 
> Also the fiber wafers insulating the fixed plates will probably blow apart.
> 
> This is why the Ham Radio Gods invented Vacuum Variables.
> 
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Hsu
> Sent: Tuesday, September 05, 2006 11:03 AM
> To: amps at contesting.com
> Subject: [Amps] Inexpensive variable air cap for amps
> 
> Hi, 
> I just purchase some teflon film,the price not too expensive($30/kg). I
> think I can insert it into low volt/small volum variable air cap as high
> volt plate tuning cap, I think teflon film  with larger ? than air, the cap
> should be smaller ,even we can use a  cheap receiver tuning cap as amp's
> plate cap if it can hold enough RF current. does anyone have this
> experience?
>                        73! Hsu
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>