Lin Robertson digital-conjurers at ROADRUNNER.COM
Tue Nov 25 23:21:26 EST 2008

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

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.


This list is a public service of the City of Tempe, Arizona

Subscription control -
Archives -

More information about the Boatanchors mailing list