DX-100 Questions

Wally Gibbons rockwall at SOURCEONEINTERNET.COM
Sun Nov 30 12:34:15 EST 2003

Well, I finally got one of these. I've been working through it. Had a
bad 6AQ5, one of the 6146 had a loose (open) plate cap. It's finally
working like I expect with a couple of questions...

60 watts output is it. High voltage is running about 650 on the meter,
and it loads to 250ma easily. But 60 watts is all the Bird will show.
I've tried a new pair of 6146, no improvement. Plenty of grid drive, it
can easily be kept at 5 ma with the drive control. Clamp tube has been
set via the manual. One mod which has been made, it's got a 3 section
365pf each variable cap for the loading cap. No switch or fine loading
control. I'm suspicious of the current reading being off, bad shunt
resistor. Maybe not really running 250 ma? Any DX-100 tips to offer?

Also, with the xtal/vfo switch in the crystal position and no crystals
installed, the 12BY7 plate runs red. It operates zero bias, and with no
crystal no drive so I'd expect it to be warm. But red? As soon as you
switch to VFO it cools right down. Is this a mode to be avoided on the

Thanks, and hope to be on the air with it soon...
And after that, I just picked up a Viking 1.

BA heaven.

Wally Gibbons, WB7ASQ
North Logan, Utah

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