[Amps] electronic switching

[Steve Katz]

Hi Rich,

PINs are readily available to 1000Vpk and of course can be placed in series
for higher voltage applications.  Remember, a PIN is not a P-N junction
device and doesn't really have a "PIV" rating...when biased OFF, its a large
value resistor and when biased ON, it's a small value resistor....using
power devices that can be biased ON with amperes of current, that resistor
can become *really* small......-WB2WIK/6

"Success is the ability to go from failure to failure with no loss of
enthusiasm." -Winston Churchill

> -----Original Message-----
> From:	2 [SMTP:2 at vc.net]
> Sent:	Tuesday, June 17, 2003 7:15 AM
> To:	Dr. William J. Schmidt, II; on4kj; AMPS
> Subject:	Re: [Amps] electronic switching 
> 
> >Well, we do..... there are diodes that will handle as much as 10kW....
> but
> >they are expensive.  Harris uses them in their gear...
> >
> **  What is the piv rating of such diodes, William?
> 
> >Sincerely,
> >
> >Dr. William J. Schmidt, II  K9HZ
> >
> >"Collector of Edison Wind-up Phonographs... Do you have one for me?"
> >Email: bill at wjschmidt.com
> >Alternate Email: wmschmidt at charter.net
> >WebPage: www.wjschmidt.com
> >
> >
> >
> >----- Original Message ----- 
> >From: "on4kj" <on4kj at skynet.be>
> >To: <amps at contesting.com>
> >Sent: Sunday, June 15, 2003 2:44 PM
> >Subject: [Amps] electronic switching
> >
> >
> >> Hello Folks,
> >>
> >> About steatite wafers used for band switching.
> >> Why dont we see switching systems based on pindiode, for input ( 100 w
> )
> >> must be possible nowadays. Even for high output power !!
> >> What say ?
> >>
> >> Jos on4kj
> >>
> >>
> >> ----- Original Message -----
> >> From: "Osten B Magnusson" <sm5dqc at algonet.se>
> >> To: <amps at contesting.com>
> >> Sent: Saturday, June 14, 2003 10:35 AM
> >> Subject: [Amps] 572B's WARNING
> >>
> >>
> >> >
> >> >
> >> > STAY AWAY FROM RICHARDSON ELECTRONICS, ENGLAND      www.rell.com
> >> >
> >> > 572B's are sold here in Europe by different dealers, the tubes are
> >> distributed by Richardson Electronics in England, and they claim that
> it's
> >> Cetron tubes manufactured for National. Sorry to tell, but it isn't the
> >> truth - it's newly produced Chinese tubes re-badged by Richardsons as
> >> National and also have ''Made in USA'' printed on them. So be careful,
> >> before buying. I have been offered, not by Richardsons, but by the
> >> distributor to get a full refund if sending the tubes back. Richardsons
> >does
> >> not even answer e-mails...
> >> >
> >> > This is part of an e-mail from a serious distributor in England:
> >> >
> >> >      >>Hello Osten,
> >> >      >>Taylor is a brand name for RF parts but these can be re-badged
> >any
> >> type!
> >> >      >>We have National 572B which are badged by Richardsons which is
> >the
> >> main
> >> >      >>outlet for Eimac, but need not be Eimac !
> >> >
> >> > There are original Cetron NOS 572B's available here in Europe, have a
> >look
> >> at   www.clhi-fi.it   It's in Italian, but click on ''Surplus'' and
> than
> >> ''avanti'' to go to page four. There are no prices on the WEB, but in
> an
> >> e-mail they asked 500 ''euros'' for a matched pair, plus postage.
> That's
> >> totally USD 645 for a matched pair!!!   I know that there are also NOS
> >> Cetron 572B's available in USA, but unfortunately we have to pay more
> >> postage, customs, 25 percent VAT etc. so here we always try to buy from
> a
> >> European Community country, this was no customs and other extra charges
> to
> >> pay.
> >> >
> >> > Probably time to get all ''glass tubes'' amplifiers marked ''junk''
> and
> >in
> >> the future only get amplifiers with ceramic tubes!
> >> >
> >> > 73 de Osten SM5DQC    e-mail:  sm5dqc at algonet.se
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > _______________________________________________
> >> > Amps mailing list
> >> > Amps at contesting.com
> >> > http://lists.contesting.com/mailman/listinfo/amps
> >> >
> >> >
> >>
> >>
> >> _______________________________________________
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> >
> >_______________________________________________
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> 
> 
> Rich, AG6K, 805-386-3734, www.vcnet.com/measures
> 
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