If you put three 6V tubes in series on a 12.6 v supply line, you get the equivelent voltage drop across each tube of 4.2 Volts. The 6146's will work but at reduced efficiency.
Good luck,
Mike - K7OV
-------------- Original message --------------
>
> "Gerry" <[EMAIL PROTECTED]>made an utterance to the drakelist gang
> ----------------------------------------------------------------------
> You don't want to hear the pro's or con's but you will nevertheless have to
> consider heater voltage incompatibilities that exist between the 12JB6's and
> the 6146's. It also matters whether the substitutes are 6146 or 6146B. 6146
> are specified as 6.3 volts at 1.25 amps and the 6146B is 6.3 volts at 1.125
> amps. The TR-3 is set up for 12.6 volts so you would have to use maybe a
> couple in series and some kind of dropping resistor for the third tube. The
> TR-4 is even more of a problem due to the series/parallel heater wiring.
> Three 6JB6A's are wired in series to drop 12.6 volts down to about 6.3 volts
&g! t; for a bunch of other tubes. The 6JB6A is specified as 6.3 volts at 1.2 amps.
> With three of them in parallel that equates to a 1.75 Ohms dropping
> resistor. But you want to do it on a TR-3 so you don't have to worry about
> series/parallel heaters. If you can solve that problem, there is no reason
> why 6146's shouldn't work in place of 6JB6A's.
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Al Parker
> Sent: Monday, May 23, 2005 8:02 PM
> To: Drake list
> Subject: [drakelist] 6JB6/6146 conversion
>
>
> "Al Parker" <[EMAIL PROTECTED]>made an utterance to the drakelist gang
> ----------------------------------------------------------------------
> Hi folks,
> I know pro's & con's on this subject have been cussed and discussed
> b4. Pse don't tell me why not to, or! why to, we've all heard those b4.
> I've always thought that someday I'd try it, and now I have a TR-3 that's
> run me out of 12JB6's so maybe it's time. I do have a lot of 6146's, and
> this TR-3 has a good SB filter, so it oughta do well.
> Has anyone done the conversion on a 3-holer? Or even a 2-holer? and
> would share experiences?
> Frank Kamp, K5DKZ, has kits available for 2-holers, but he tells me he
> hasn't done a xcvr. He let me post some of his info a yr or 2 ago, and
> I've got some other stuff on the subject, on my website if you need
> refreshing.
> tnx, 73,
> Al, W8UT
> New Bern, NC
> BoatAnchors appreciated here
> http://www.thecompendium.net/radio/
> http://www.hammarlund.info
>
>
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