[Heathkit] re 6146 tubes

[Wayne Hoskins]

I read somewhere (I thought it was here, but apparently not) that they 
are actually late-model 6146As, built for applications like the SB/HW 
series that the current B type wouldn't really work for.  Apparently 
all the tube envelopes of the time read "6146B", so the "6146A" marking 
was added to the glass.

All the 6146s I remember seeing have had the three-letter designation 
-- not sure what it means, but they all seem to work the same.


--Wayne AD5ST



On Jul 27, 2005, at 10:20, Murray Grandy wrote:

> Looking at the recent post re 6146 tubes, I have a question or two. I 
> have a pair of GE's that are marked 6146A on one side and 6146B on the 
> opposite side. The 6146A looks like it was put there when the tube was 
> made, but the 6146B looks more like it was put on by a rubber stamp 
> kinda situation. Also have some other 6146's with letters like "UDA" 
> "TDA" "BDB" "LDA" etc. Using the letter, number thing, A=1 etc these 
> letter groups turn out to be "UDA=21 4 1. I have a E.F. Johnson that 
> has "NDA" printed under the 6146. What does all that mean. Can I use 
> the 6146A/B's as 6146/6146A.
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