[Heath] [Heathkit] 6146B Issues

[Glen Zook]

There is no list.  However, the 6146B/8298A and the 6146W tubes require different neutralization and most of the Heath SB-Line equipment are very "iffy" in whether or not they can neutralize.  Some units seem to work OK but even more have problems.  One can modify the neutralization circuit so that the transmitters / transceivers will neutralize.  However, for "plug and play", one really needs to use the 6146, 6146A/8298, or 6293 tubes, especially if they have problems neutralizing the tubes.

There are those who violently disagree with my article on the 6146 family of tubes:

http://k9sth.com/uploads/The_6146_Family_of_Tubes_1.pdf


However, over the years, I have literally seen well over 10,000 transmitters that use the various 6146 family of tubes and my observations are outlined in the article.

There are those who say that they have used the 6146B/8298A or 6146W in transmitters that were designed for the 6146 or 6146A/8298 without any problems.  I do believe them.  However, I have received notice from a LOT more people who say that they have had problems and went back to the earlier tubes.  It seems to be how the individual tolerances of the components "add up" as to whether or not the later tubes work.

I have worked on individual transmitters, of exactly the same model, with serial numbers within 10 of each other.  With those transmitters 1 was happy with the 6146B/8298A and the other 2 were very unhappy.
 
Glen, K9STH


Website:  http://k9sth.com



On Friday, October 11, 2013 5:13 PM, "Gary H. Harmon, Jr." <gharmon at idworld.net> wrote:
 
I seem to remember there are some pieces of Heathkit that are not
HAPPY-HAPPY-HAPPY with 6146B tubes.  Is this a myth or is there a list of
pieces that prefer to not see a 6146B?



Thanks and 73,  



Gary H. Harmon, Jr. - K5JWK

6003 Archwood

San Antonio, TX 78239-1504

210.657.1549h / 210.884.6926c/t



"Retirement means every day is a Saturday except Sunday"

http://www.grissomroadcoc.org





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