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--- In ham_amplifiers@..., "Mike Sawyer" <w3slk@...>
wrote:

I see that there's one of these on that e-auction place for ~$57.

I
understand that this is a pretty good tube since it doesn't require
any special socket. If I didn't have so many irons in the fire, I'd
snag this. But hell, I don't use my amp enough as it is. So here it
is
with about 2hrs. to spare.

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m

Mod-U-Lator,
Mike(y)
W3SLK

### The F1 version only has a MU = 5......... so it's useless
for GG !

### It looks IDENTICAL to the 3CX-3000F7 MU= 200 which can be
used in GG. Both versions have flex leads to both the fil
connections AND the grid..... which makes it a pain to mount.

### Here's what fellows do to mount a 3000F7. Disconnect the
flex lead for the grid... and toss it. Replace with a vac var
flange for the same od of the grid ring on the tube.

### Bolt the new vac variable flange to the chassis... so the
tube is pinched/compressed by the new vac var flange. Connect the
fil flex leads to the bifilar [shorten em up 1st]... done.

### some will make /machine a split block of aluminium... both
halves of this block are simply bolted to the chassis... and
transverse machine screws compress the two halves together....and
pinch/compress the grid ring on the tube......again, the original
flex lead to the grid is tossed 1st... and fil leads are
connected as above... done.

### This info is just in case somebody comes across a F7 version
[identical tube to a 3CX-3000A7].

Both the vac flange and machined block idea came from some 11 m
op.... who had 3 x F7's in parallel... mounted exactly as
described... and that was in a mobile !!

later...Jim VE7RF