Hi Mike,
Just a thought, but you may want to try EBay for those tubes. It's amazing
what one can find on there. I even found Roman coins from 4000 AD. So, As
long as your tubes aren't any older than that. Hi Hi.
God bless,
Mark
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-----Original Message-----
From: Michael Ryan
Sent: Sunday, March 16, 2014 2:55 PM
To: [log in to unmask]
Subject: Tuning the 811H
Hi Tom and Alan:=20
As users of the 811H, I'd paid particular attention to my load control =
settings over the weekend and I discovered something strange.=20
=46rom the starting position, I find that if I rotate the control =
counter clock wise, the pitch on my TW-1 steadily rises.=20
I don't think this is the norm. When completely tuned, with the max =
drive, again if I move the load control counter clock wise off the 3 =
position, again the pitch steadily increases. I don't think this should =
be the case. However, shouldn't I just trust the TW-1 and adjust the =
load and plate controls until the max pitch is obtained? After tune up, =
I'm sure if I do that, the load control will possibly move down to the 2 =
mark. perhaps even lower. I'm also seeing a reduced output on 20M, 450 =
with 60 of drive and that could be an indication of one of the tubes =
going.=20
I didn't check the SWR between the 102 and amp but after 30 minutes of =
20M operation yesterday, my 102 was pretty warm to the touch. Allot =
warmer then on 40M or 75M, where I get 600W with 50W of drive. So I may =
have a higher SWR between the rig and amp and this is another sign of a =
bad tube.=20
This isn't good news as RF Parts doesn't have a good supplier of 811s or =
572Bs at the moment and I don't know how good the Chinese made tubes =
really are. Very poor quality from what I've heard.=20
73:=20
Mike VO1AX=20
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