[Hallicrafters] 12at7

[Fern Rivard]

I have to agree with Jack with failures of 12AT7 tubes. I recall working 
on commercial vhf radios back in the 60's with lots of those 12AT7's 
showing bad on the ol' tube testers.    Fern




----- Original Message ----- 
From: "Edward B Richards" <zuu6k at juno.com>
To: <w1jhs at verizon.net>
Cc: <hallicrafters at mailman.qth.net>
Sent: Monday, March 05, 2007 6:00 PM
Subject: Re: [Hallicrafters] 12at7


> Jack;
>
> I have not found the 12AT7 more failure prone than other tubes.
>
> 73 from Ed Richards K6UUZ
> Simi Valley, CA. Home of Air
> Force 1 pavallion
>
> On Mon, 05 Mar 2007 19:51:53 -0500 "Jack Schrader" <w1jhs at verizon.net>
> writes:
>>
>> Lately I seem to have found a bunch of 12AT7 that test bad or just
>> marginal on my B&K 700 tube tester but I also have many that test
>> ok. I have not tried to switch them in and out of a good operating
>> receiver but 'am wondering if this tube
>> is prone to failure or is it maybe the B&K tester or even the
>> operator.
>>
>> Would appreciate any thoughts you might have.
>>
>> 73   Jack
>> ______________________________________________________________
>> Hallicrafters mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
>> Help: http://mailman.qth.net/mmfaq.html
>> Post: mailto:Hallicrafters at mailman.qth.net
>> ----
>> List Administrator: Duane Fischer, W8DBF **for assistance**
>> dfischer at usol.com
>> ----
>> Hallicrafters Collectors International: http://www.w9wze.org
>>
>>
> ______________________________________________________________
> Hallicrafters mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hallicrafters
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Hallicrafters at mailman.qth.net
> ----
> List Administrator: Duane Fischer, W8DBF **for assistance**
> dfischer at usol.com
> ----
> Hallicrafters Collectors International: http://www.w9wze.org
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.7/711 - Release Date: 
> 3/5/2007 9:41 AM
>
>