[Hallicrafters] Hallicrafters Digest, Vol 85, Issue 12

[James Liles]

Hi Walt:
The 'T' in the 12NO90T indicates 9 pin, the absence, Octal.  I tried a query 
for the 12NO90T and the others and found the octal to be the only ones that 
were inexpensive and available.  Thetubecenter and Surplus sales --- no hits 
for the 9 pin 'T' version.
KIndest regards Jim K9AXN

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Message: 4
Date: Fri, 18 Feb 2011 22:53:34 -0600
From: "Walt Cates" <cateswa at msn.com>
Subject: Re: [Hallicrafters] delay tube
To: "hallicrafters" <Hallicrafters at mailman.qth.net>
Message-ID: <SNT138-ds1109FC671A195EA373B6B3B3D70 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"

That is a 12NO90T which means 12vac, normally open cold, 90 second delay and 
T for thermal. A lot of folks including myself prefer the 12NO120T which 
gives the 8122's a little more warm up before you slap the voltage to them. 
The last one I found was at Surplus Sales of Nebraska @ $50. I have seen 
them for as high as $115 each.


Best Regards, Walt Cates, WD0GOF, 
http://www.myhamshack.com/WD0GOF/<http://www.myhamshack.com/WD0GOF/>

I pity the self made man, he is definitely working at a disadvantage. I 
cherish the help from God, family and mentors.