[Amps] RCA 8122 Tubes

[m.ford]

----- Original Message ----- 
From: "R L Measures" <r at somis.org>
To: "Glenn McNeil" <vk4tzl at bigpond.net.au>
Cc: <amps at contesting.com>
Sent: Thursday, June 08, 2006 9:09 AM
Subject: Re: [Amps] RCA 8122 Tubes


> 
> On Jun 8, 2006, at 1:55 AM, Glenn McNeil wrote:
> 
>> Hello Gang,
>>
>> I've just been given a pair of RCA 8122 Tubes...never used, still  
>> in the
>> original boxes. Date code 69-04.
>>
>> What are the chances they are still OK for use ?
> 
> Very good if the Al-Ox ceramic has a purplish color from added  
> manganese.    A high-potential tester will give the answer is  
> seconds.  With 5kV between the anode and screen, there should be less  
> than 5uA of leakage.  i would not uses these tubes in a unmodified  
> NCL-2000.

The best modification for the NCL-2000 is to change the way the operator abuses it.
Keep the meter in screen current and watch it all the time. I'll bet it was all the gg guys that got
caught looking at the grid current that gave the amp a bad name.

Mike  k1ern



>>
>> Any ideas
>>
>> 73
>>
>> Glenn
>> VK4TZL
>>
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>>
> 
> R L MEASURES, AG6K. 805-386-3734
> r at somis.org
> 
> 
> 
> _______________________________________________