[GreenKeys] Transient voltage suppressers

[Ed Sharpe Archivist for SMECC via GreenKeys]

here is a little info on them
 
http://so-much-stuff.com/pdp8/pdf/6rs20sp.pdf
 
ed#  _www.smecc.org_ (http://www.smecc.org)  
 
 
In a message dated 3/25/2015 8:14:58 A.M. US Mountain Standard Time,  
douglas-w-jones at uiowa.edu writes:

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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