tubes

[Paul Kraemer]

Back in the day at the government lab we preferred Sylvania and Amperex 
brands. Today you takes what you gets that lites up.
Paul K0UYA
----- Original Message ----- 
From: "Lin Robertson" <digital-conjurers at ROADRUNNER.COM>
To: <BOATANCHORS at LISTS.TEMPE.GOV>
Sent: Monday, November 24, 2008 7:45 PM
Subject: Re: tubes


> Jack,
>
> In my personal experience it seems to depend on the radio, and the 
> circuit.  I have a RX-1 Mohawk that had all the stability of a floating 
> dice game, until I replaced the 12AT7 master oscillator tube (a Generous 
> Electric) with a Sylvania.  I tried several GE's, but they all drifted. 
> Now, the thing only drifts 100-300 Hz in an hour.
>
> I guess it depends on the application.
>
> -Lin/KJ6EF
>
> At 08:03 PM 11/24/2008 -0500, you wrote:
>>Need some help on tubes.
>>
>>My sx101a lost part of its hearing and selectivity and when I checked the 
>>tubes I found that the 12BY7 was weak. I replaced it with one that tested 
>>better along with a different 12AT7 and it seems to work much better.
>>
>>My question is this. Is there one brand of tube, namely the 12BY7, that is 
>>better then another and the same goes for the 12AX7 and 12AT7?
>>
>>I have never paid particular attention to what brand of tube I use.
>>
>>Tnx & 73
>>
>>Jack
>
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