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Re: [Amps] RCA 8122 Tubes

To: "R L Measures" <r@somis.org>
Subject: Re: [Amps] RCA 8122 Tubes
From: "m.ford" <k1ern@pioneerwireless.net>
Date: Fri, 23 Jun 2006 18:49:25 -0400
List-post: <mailto:amps@contesting.com>
----- Original Message ----- 
From: "R L Measures" <r@somis.org>
To: "Glenn McNeil" <vk4tzl@bigpond.net.au>
Cc: <amps@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@somis.org
> 
> 
> 
> _______________________________________________

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