[GreenKeys] Transient voltage suppressers

[Lester Veenstra]

I use these from DigiKey:

P6KE220CA-E3/54GICT-ND .28580 28.58 T
TVS DIODE 185VWM 328VC AXIAL

http://www.digikey.com/product-detail/en/P6KE220CA-E3%2F54/P6KE220CA-E3%2F54
GICT-ND/3306427


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
Jones, Douglas W
Sent: Wednesday, March 25, 2015 11:14 AM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Transient voltage suppressers

Teletype Model 33s use several GE 20SP4B4 thyrectors as
transient voltage suppressers.  I note that they are
currently available on Ebay from s source I know nothing
about.  They claim more than 10 available.  A bit pricey,
but I haven't seen these available very frequently.

There are also a pair of these in my 1965 PDP-8, one
across the mercury relay coil, the other across the relay
contacts.

-- http://www.ebay.com/itm/121419976637

		Doug Jones
		jones at cs.uiowa.edu
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