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J999w ) writes:
Weren't the "TO" keyers popular in those days? I believe it was so popular that Hallicrafters made them for a while. jw K9RZZ (not that old) That would have been my guess, because it made such a splash that it would seem to have been common. Oddly, though, I don't see it in the 1961 Handbook, though I would have expected it. By 1968, the next one I have, it's gone solid state. There is an IC version of the '9TO keyer, and I know I've seen plenty of references to it, but unless I start digging I can't tell what tube lineup the original used. On the other hand, the IC version seems to suggest more than a couple of tubes. There are a couple of flip flops, and you'd need a dual triode for each one. The 1961 Handbook shows a simple keyer, with a 12AU7 as the "clock" and rectifier, and another 12AU7 for the rest of the keyer. A relay actually keys the transmitter. That seems to be closer to the level of the keyer the original poster is asking about. Michael VE2BVW |
#2
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The 1961 Handbook shows a simple keyer, with a 12AU7 as the "clock"
and rectifier, and another 12AU7 for the rest of the keyer. A relay actually keys the transmitter. That seems to be closer to the level of the keyer the original poster is asking about. Yes (original poster here) - that's the only handbook I have, and it's the closest I've found. Could be the original builder devised a way to key the output with the 6AS7 (which is the size of a 6L6 - he cleverly recessed the base of the tube into the chassis, below the paddle 'deck'). Makes me want to homebrew again! Just can't get over how well this thing is built - and it works so doggone perfect I can't believe it! Acts and looks like it was built yesterday. Of course, it may be just a few years old built from an old schematic... hard to say. Anyway, thanks for the input Dave WB7AWK |
#3
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"Dave" ) writes:
The 1961 Handbook shows a simple keyer, with a 12AU7 as the "clock" and rectifier, and another 12AU7 for the rest of the keyer. A relay actually keys the transmitter. That seems to be closer to the level of the keyer the original poster is asking about. Yes (original poster here) - that's the only handbook I have, and it's the closest I've found. Could be the original builder devised a way to key the output with the 6AS7 (which is the size of a 6L6 - he cleverly recessed the base of the tube into the chassis, below the paddle 'deck'). Makes me want to homebrew again! Just can't get over how well this thing is built - and it works so doggone perfect I can't believe it! Acts and looks like it was built yesterday. Of course, it may be just a few years old built from an old schematic... hard to say. Anyway, thanks for the input Dave WB7AWK But that's the thing. With home made stuff, you can never count on someone building it just like the article. Obviously, there were some articles over the years that somehow became highly popular, maybe because they were intended to be duplicated rather than a write up of something someone built, but those are the exceptions. I sometimes find it amusing to see people ask about "a two tube radio that was in one of the hobby magazines around 1965", because something that generic would have appeared a whole bunch of times, with different tubes, in different magazines, even different years, and even because someone wound coils on pillboxes instead of using Airdux coils. It's the more complicated things that tend to be unique. And of course even then, there is no guarantee that someone built it from a magazine article After all, someone has to build them in the first place before they get into a magazine, and even then not everything that was built made it into a magazine, or was a copy of a magazine article. Use the 1961 schematic to trace the keyer, and maybe you'll find a match. I know it's often easier to start with assumptions such as that when tracing, and soon you'll find whether it is the same thing, or close. Michael VE2BVW |
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