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01 tube as RF amp..
"ken scharf" wrote in message ... Lynn wrote: "ken scharf" wrote in message ... Lynn wrote: "Tio Pedro" wrote in message ... "ken scharf" wrote in message ... 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 |
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