[Moon] Help With Cavity Amp

[k2dh at frontiernet.net]

All-
I've been struggling to get my TH-328 cavity amp running properly.   
Just last night I made a major discovery.  The cavity, which was sold  
to me this summer by W1GAN (he bought it from W4ODW, who apparently  
used it for some time) was represented to me as being an OE9PMJ- BUT  
IT'S NOT.  Looking closely at it, there are some real differences  
between it and the drawings Peter did for the DUBUS article so many  
years ago.  So I got to thinking, "I've seen this cavity somewhere  
else".  Sure enough, I looked and it's actually the cavity that Buzz  
Miklos WA4GPM described in the 1985 Central States Proceedings that  
some people used with the EIMAC YU-129 tubes.  At some point, somebody  
(ODW?) put a TH-328 into it and that's how I got it- with a  
water-cooled '328.
So here are my questions:
1) How did this cavity do with the YU-129 (water-cooled)- anybody know?
2) How do those two tubes (YU-129 and TH-328) compare- performance at  
1296, specs, differences, etc- anybody know?
3) How does this cavity (GPM's design) work with a '328 in it instead  
of a '129- anybody know?
4) What, if any, changes need to be made to the cavity to successfully  
use it with a '328 if it can't be optimum the way it is- anybody know?
5) Should I be looking for a YU-129 instead of continuing down the  
road with a '328 in it?  I think I heard some years ago that '129s are  
even more rare than '328s.
6) There was an article written in the '93 Central States Proceedings  
by W9XA called "YU-129/TH-328 KW Amplifier"- I assume this may contain  
some useful information.  Does anybody have a copy they could scan and  
email to me?
7) Does anyone have a GOOD: 328, 338, or 129 they would sell me?

Thanks in advance for any and all help- I'd really like to get this  
thing going, but if it's a lost cause, I'd also like to not spend the  
rest of the winter fiddling with it (besides, my only known good  
TH-328 is a loaner and I don't want to kill it "performing  
experiments").

73
Dave K2DH