Fw: [HomeBrew] 6J5-6L6 MOPA xmtr-need approximate current output.

[Dick Foster]

 Sorry about the empty "reflection".

 I have an enormous amount of nostalgia involved with the 6L6 MOPA
 transmitter.  Mine was the 6AG7 / 6L6 version from the ARRL Handbook.  The
 rig was a loaner from my Elmer.  He told me "Don't worry if the 6L6 burns
 out.  We're pushing it kinda hard.  I think a 6L6 is just as good as an 807
 any day."  I didn't understand until much later that he put 500 volts on
the
 plate of the 6L6!  It was a metal tube, ran hotter than a $2 pistol and
 never burned out.  If you want to try that, do so at your own risk, or at
 least the risk of a fried 6L6.

 100 mA is probably enough for a CW transmitter if you don't key down for
too
 long.  200 mA would be more conservative.  The 520 volt CT transformer with
 silicon rectifiers and a good filter capacitor of 100 uF or more should
give
 you at least 300 volts on the plate.  At 100 mA plate current, that's 30
 watts in and you should get about 15 to 20 watts out at least on 80 and 40
 meters.  Less on the higher bands.

 Very 73,
 Dick W5TA

> ----- Original Message ----- 
> From: <n6kyr at netzero.net>
> To: <homebrew at mailman.qth.net>
> Sent: Sunday, November 20, 2005 11:40 AM
> Subject: [HomeBrew] 6J5-6L6 MOPA xmtr-need approximate current output.
>
>
> ** Please do NOT cross-post messages when posting to HOMEBREW **
>
> Hi to all:
> I just wanted to know what would be a good transformer to use with this
> setup?
>
> I was thinking about eliminating the rectifier tube and use s/s diodes in
> its place. I would like the power output to be in the high teens/early
20's
> if possible. Any suggestions? I suspect the xfmr should put out at least
100
> mA or more. I have a couble of 520 VAC CT 90 mA transformers but I suspect
> they might not do the trick. Comments pleeze! Cal, N6KYR/8
>
>
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