"ken scharf" wrote in message
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Lynn wrote:

"ken scharf" wrote in message
...
Lynn wrote:

"Tio Pedro" wrote in message
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"ken scharf" wrote in message
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Even with it's 'hard vacuum' the 01 didn't have as good a 'getter'
as later tubes and would arc over with more than 130 volts or so. It
was used as a transmitter before the type 202 tube became widely
available, but was a QRP thing, less than a watt input.

Will it have enough output to drive a 245?
I doubt it very seriously. I suppose if perfection was achieved in
matching
the 01's output to the 245's grid was possible (I, for one cannot do
it),
the losses would be enough to tickle it into the beginning of class C.

Ken's idea of going to class A might work, but the 245 would be running
in a very inefficient mode. There is one website showing a couple of
45's running in AB2 (how do you make a sub 2?) . Another website
has some interesting stuff with 245 chatter...... (you may have already
seen it, but just in case..........

http://www.antiquewireless.org/otb/29amp.htm

Old Chief Lynn, W7LTQ and a couple commercials
Actually AB1 would be better. My point was that you don't need driving
power until you start drawing grid current. As long as the final
doesn't draw grid current you are not loading down the oscillator tube.
The question was would the 01A be able to drive a '45. My answer is
yes, but probably not to full output....meaning you won't be able to
supply much grid current

Yor're correct (as qualified, and as usual)
But the 01A is NOT a suitable (satisfactory?) driver
for a 45.

Happy New Year! (Will I see any of you on "Straight Key Night?(

Old Chief Lynn
Well the original question was would it work, and the answer is yes, but
not very well.

If you want to use tubes from the same era, then I'd pick a '27 for the
oscillator. The 27 is probably the first tube in a chain of evolution
that led up to the 1626 which was used for the same purpose in the ARC-5
transmitters. (though the 1625 is a heck of a lot easier to drive than a
'45!).


Right again, Ken. Those ARC-5's were sure a lot of fun when new ones
were $5 a crack! Used one for VFO on a BC-375 when the'375 was
$45, new, complete with all tuning units, dynamotor, antenna tuner,
antenna switch with RF ammeter, etc! Glory days of radio. If one didn't
mind a little "yoooooop de yoooop yoooop" on CW, the 211 in the
'375 in MOPA mode made a nice oscillator tube as well!

Old Chief Lynn