tubes

[Lin Robertson]

At 10:07 PM 11/24/2008 -0500, you wrote:
>>>  I should have said consistant difference between brands.  There may be 
>>> a difference between individual tubes but it would be rare to find a 
>>> consistant difference between bands
>David
>KC2JD/4


According to a series of three articles on fixing problems in the RX-1in 
Electric Radio, K6AD states the following:

"Having a good supply of 12AT7 tubes on hand, I measured the drift 
contributed by various cold tubes in the warmed-up steady state 
oscillator...For drift, GE tubes seemed the worst, while Sylvania gave the 
best results."

For full text of the article, see "New Hope for your Heathkit RX-1"; I 
think it's Dec 1996-Feb 1997.  (I only have copies, not the originals.)

In this case there WAS a consistant difference. Q.E.D. : Try it.

-Lin/KJ6EF

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