[Amps] 6146B vs 6146W

[Gary Schafer]

The 6146W has a ruggedized filament. The rest of the characteristics may 
be the same as a 6146A or a 6146B depending on when the 6146W was built. 
 From what I have gathered the early 6146W was the same as the 6146A but 
with rugged filament. After the 6146B came into existence, a short time 
after that all 6146W's were made the same as the 6146B but with the 
rugged filament.

So if the 6146W's you have are later versions then they are probably the 
same as the B.

As far as a B not working in place of a regular or A version, I have 
never had a problem with interchanging them except in the collins radios 
where you sometimes had to change the neutralizing circuit to get them 
properly neutralized.
In VHF and UHF radios it may be more of a problem.

In your HF rig, plug them in and if you can neutralize the final they 
should work fine.

73
Gary  K4FMX


Steven Grant, W4IIV wrote:
> you may run the "W" if you wish
> the 6146B had different capacitances from the 6146, and 6146A, so the B would not work properly in older (and some newer) equiptment. it caused bad parasitics.....in my opinion, this tube (the "B") should not have been called a 6146 at all...it is that different
> 
> if you choose to run the "W" (a rugged version of the 6146A) it should work ok tho cause those tubes were much more stable...of course settings may be a tad different
>  
> steven
> Steven Cook <sccook1 at cox.net> wrote:
> I have been reading up on the 6146 and would like to know if the "W" version would be suitable for use in a TS-830S. I have read that the "W" version is rated for less plate dissipation -- is this because it is a ruggedized version and the ratings are "conservative," or does the "W" truly have less plate dissipation than the "B" version.
> 
> Thanks in advance...
> 
> WG7K
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> STEVEN GRANT    W4IIV
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