I have been going through piles of stuff, trying to clear out some junk. I just found one of my earliest creations - a dummy load.
I grew up in Washington DC, and we had (1950s) a number of surplus outlets, it being not long after world war 2. Plus we had a full line electronics parts company within bicycle distance. I was over there every day buying resistors or tubes or whatever. They used to put out grab bags of stuff for 50 cents or whatever. usually useless, but fun to look through for treasures. And the clearance table. They had a stack of aluminum radio tuner dials. ALuminum sheet about 4.5 x 5.5 inches with a AM radio band printed on it. And a hole bottom center for the tuning cap shaft.
These dial faces were cheap, and by bending down the last inch on either end, it made a handy little U-chassis. I had bought a pile of them, and used them for just everything.
At some point I needed a dummy load for amplifiers. It has three ceramic wirewound 12 ohm resistors wired in parallel standing on end. Maybe 15-20 watts each. I remember taking apart a patch panel or something so I had a big box of those long frame phone jacks. Mounted one of those in the "side" wired to the resistor bank. And I can see my old mind working. I added an RCA jack with a 0.1uf cap to the hot side of the load, so I could monitor the output.
Crude and ugly, but I used to use it a lot. What the heck it was 50 some years ago.
I know there are going to be other memories coming to light as I dig.
I grew up in Washington DC, and we had (1950s) a number of surplus outlets, it being not long after world war 2. Plus we had a full line electronics parts company within bicycle distance. I was over there every day buying resistors or tubes or whatever. They used to put out grab bags of stuff for 50 cents or whatever. usually useless, but fun to look through for treasures. And the clearance table. They had a stack of aluminum radio tuner dials. ALuminum sheet about 4.5 x 5.5 inches with a AM radio band printed on it. And a hole bottom center for the tuning cap shaft.
These dial faces were cheap, and by bending down the last inch on either end, it made a handy little U-chassis. I had bought a pile of them, and used them for just everything.
At some point I needed a dummy load for amplifiers. It has three ceramic wirewound 12 ohm resistors wired in parallel standing on end. Maybe 15-20 watts each. I remember taking apart a patch panel or something so I had a big box of those long frame phone jacks. Mounted one of those in the "side" wired to the resistor bank. And I can see my old mind working. I added an RCA jack with a 0.1uf cap to the hot side of the load, so I could monitor the output.
Crude and ugly, but I used to use it a lot. What the heck it was 50 some years ago.
I know there are going to be other memories coming to light as I dig.
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