differences in 6146 A and B

[Larry Knapp]

Larry - Certainly not a "dump" or "dumb" question.  The 6146B was developed
primarily for SSB service.  So using 6146B's in your SB-102 should be fine.
The "B" should be fine for all the HW & SB series of gear.  I wrote the
following to the Heath list several months back.  Hope this can be of
assistance.

The following is the development sequence:
6146   Original Design
6146W  Ruggedized version of the original
6146A  Improved basic 6146
6146B  Final improvement

The 6146B "appears" to be designed specifically for SSB service.  The 6146B's
have a higher plate dissipation than do the 6146 or 6146A and also there are
filament current differences.  There are more differences between the
6146/6146A and the 6146B and are illustrated the vacuum-tube data contained in
the back of the ARRL Handbook.  With appropriate research and noting the
variations, it may explain why neutralization is not the same and why some
types will work better for SSB or AM service when using different tube types.

A tube substitution guide reveals that there are several commercial tubes that
can replace the individual 6146 tubes.  This is not meant to be all-inclusive:

6146, 6146A, 6146B  -   8298A, 8192A

I am not sure if 8298's and 8192's come in B or W versions.

An important thing to remember, regardless of which variation you use, is to
ALWAYS use two (or more in the case of the Johnson Valiant) of the SAME
variation.  This can give you real headaches if you mix model variations.

I hope I have helped clarify some of the issues.

Best 73, Larry (KC8JX)

--- Larry Bratcher <lbratche at SWBELL.NET> wrote:
> I want to replace the finals in my SB-102.  I can find 6146B tubes locally
> but not sure if they will work or not.  What is the difference in the 6146,
> 6146A, and 6146B?  Hope this is not a dump question!
>
> Thanks
>
> Larry


=====
May your days be full of sunshine and good thoughts fill your head.
From: Larry Knapp, KC8JX, St. Joseph, Mi  49085
  Best 73's

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