[Amps] identify new from used tubes

[John Irwin]

Hi
The 4cs250r is similar to the 4cx250r. A tube that is "new" would not have been plugged into a tube socket.  It is not "new" if it was.  When tubes are plugged into a tube socket the socket makes scratches on the tube pins.  Looking at them thru high magnification would identify the one that was"new".  If the unit was plugged in then the two units that had the most scratch damage would show as the two most used pair. 
 
john kb9tc
identify

pe1hwo <pe1hwo at zonnet.nl> wrote:
It usually is indicated with some paint stripe on the radiator.
This paint vanisish with heating. Something like that.
Please tell me John how is it done on the 4CS250R?

73 André pe1hwo

----- Original Message ----- 
From: John Irwin
To: pe1hwo
Cc: amps at contesting.com
Sent: Saturday, August 06, 2005 9:20 PM
Subject: Re: [Amps] 4CS250R for sale 3 pieces


If you are interested I can tell you how to identify the" new " one

john kb9tc

pe1hwo 
wrote:
Before I put them on Ebay, I would like to know if anyone on this list would
like to have them. I have 3 Eimac 4CS250R tubes. One is new, 2 are pull, but
i don't know which. According to the service sheet they were still in good
working order. Please make me an offer.

73 André pe1hwo

_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps