[GreenKeys] Thyratron used in audio ! !

[Larry Tighe]

At the Cedar Knolls Telephone site, he uses a Model 19.  Also, he has a link to the "cry baby" for those too young to have missed it.


http://cedarknolltelephone.com/cedartel/nsn2.wav  click for cry baby

http://cedarknolltelephone.com/  click for incredible basement collection
  ----- Original Message ----- 
  From: Bruce Gentry 
  To: greenkeys at mailman.qth.net 
  Sent: Wednesday, March 22, 2017 8:41 PM
  Subject: Re: [GreenKeys] Thyratron used in audio ! !


  The type 884 triode thyratron was very popular as a sweep generator in ultra low budget oscilloscope kits. Many kids bought and built them with "cut grass-pump gas-throw newspapers" money.� If the 884 tube failed, it was so expensive to replace that the scope would often be scrapped or re-purposed as a tuning indicator for an RTTY modem.� I bought one of the scopes, missing the 884, at a flea market (in 1967) for 75 cents and used it for that exact purpose. Who remembers or built a modem using television horizontal oscillator coils for the filters?� � AND- I do remember the "cry baby" signal in old telephone switching systems.

  Bruce Gentry KA2IVY

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