Replace each "strange" char with a "0". Then you get "500 pF".
But I'm sure you knew already ;-)
Another one of that character encoding sh.. !
73, Frank
On Thu, 2004-01-08 at 13:33, R.Measures wrote:
> ** How much C is: 5ÿÿpF?
>
> >
> >Gentlemen,
> >
> >Not too long ago in this reflector a discussion was had about certain RF
> >power capacitors being prone to failure in the ALPHA 77Sx amplifier, more
> >specifically thus:
> >
> > :: "The 16ÿm doorknob padder should have a higher ampacity."
> > From what I see of the schematic, C4ÿ: 5ÿÿpF/5KV is type 85ÿs.
> >
> > :: "The two 8ÿm doorknob padders are prone to failure."
> > They are listed as C41,42: 1ÿÿpF/5KV, type 858s.
> >
> > :: "The Plate Blockers are too light."
> > They are listed as C2ÿ,21: 1,ÿÿÿpF/5KV, type 858s.
> >
> > :: "The Plate Choke RF bypass capacitor is prone to failure."
> > It is listed as C35, 1,ÿÿÿpF/5KV, type 858s.
> >
> > Observed: The additional bypass caps on the plate circuit are
> > 2,ÿÿÿpF/6KV disk ceramics. Two of these parallel a
> > 15uH, 1 amp RF choke, L9.
> >- - - - - - - - - - - - - - - - - - - - - - - - -
> >Questions:
> > 1. What are your recommendations for upgrading the reliability
> > of the capacitors above? Several issues arise: E and I ratings,
> > and the best type: HT50, HT58, HT57...?
> >
> > 2. If the amplifier is capable of 2.ÿ plate amperes on the 'Sx
> > version with two 3CX15ÿÿA7 finals, then is not L9, at 1.ÿ amp
> > prone to failure from over heating?
> >
> > 3. The capacitors paralleling L9, the disk ceramics, are rated
> > at 6KV. However, should their value of capacitance increase?
> >
> > 4. The 16ÿm and 8ÿm padders seem kind of light in capacitance for
> > the new output impedance of two 8877's. Should not their value
> > increase dramatically to affect the tank's Q?
> >(Reference: HV:3,9ÿÿVDC)
> >(Vac.Var. changing to 7~1,ÿÿÿpF/7.5KV)
> >Thank you for your opinions.
> >
> >Hal Mandel
> >KA1XO
> >_______________________________________________
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> >http://lists.contesting.com/mailman/listinfo/amps
> >
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