John,
Glen Zook K9STH has a good paper on the variants posted on his web site
I think this is a good URL. http://home.comcast.net/~k9sth
Good luck, George KB2Z
At 12:15 PM 8/28/05, you wrote:
Thanks to Jim, Larry et. al. for the great advice on my Valiant
restoration project.
I'm very interested in the common wisdom re: the 6146 variants
that 'work' in this rig.
Now, I've been a boatanchor fan since they were state of the art
- have done quite a bit of tube design, mostly audio though, and I
do have quite extensive documentation on most tubes made in the last 100 years.
So really there's probably no excuse for this question other than
laziness - what exactly are the 6146 characteristics that the
Valiant design "favors" over the other variants? A freind who has
re-built a lot of these rigs says to only use 'plain' ones. In my
ignorance, I bought a nice full set of 'W's and the transmitter
wouldn't even resonate on any band. ;{} I put three 'B' s in the
finals, and we're where we are now - OK on 20M and above, 'runs
away' below that.
What do y'all recommend for Valiant finals / modulator tubes?
On the HV B+ filter issue - mine are iffy, were replaced sometime
in it's history, but I'm going to renew them - what is the
recomendation for a more 'modern' replacement - keeping in mind
that I'm looking for the best AM fidelity I can squeeze out of this rig.
Cheers
John KB6SCO
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