Few years ago I bought a bunch of 5C22 thyratrons from Richardson. They came in National tube cartons. None would fit the standard Johnson jumbo 4 pin socket due to the little alignment pin being in the wrong place. I had to cut the pin off to make them work, it slides into the base slot like a bayonet and turns to lock the tube into the base. After this encounter, I was worried. My concern was warranted when the tubes lasted no longer than 6 months before they began to mis-trigger. They were used as the crowbar trigger device in a big 15 kV 6 Amp plate supply. We could not live with constant firing of crowbar protection circuit. I never used that brand again, oulled them all out and trashed them. Switched to E2V from the UK. These particular National tubes were marked made in USSR I believe.
73 John K5PRO ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
