Whether I am successful is only a side issue.
Until now, the increasing pile of unfinished projects was overwhelming me. The PS filters are all in one can, now replaced with discretes.ĭon, you have changed my slant on all this 'stuff'.
I think there are 3 in the generator that are NOT power supply filters. I'm going to put the top and bottom covers back on with a few spacer washers so the tubes can breathe just a wee bit.īTW. I'll see just how precise in the next day or so as I try it again and again. Nailing it exactly on 100mhz allows you to tune the generator to that frequency for precise dial calibration. Duh! Otherwise all you can do is scan for active channels which it does automatically. Turns out there is, in plain sight, a row of numerical buttons and one to the left marked "direct".
It took me quite some time to figure out how to manually tune it to 100MHz for my generator test. That, btw, is a mid 80's Sony reciever with digital tuning. It made no difference, as the IG-37 functions fine on my test reciever. I used the scope, and just did math, but since the sine waves are not absolutely pure sine waves, the resultant RMS voltage settings they want you to do are probably just a bit off. One thing I'll have to do later is go back and align it again, once I get a true RMS meter fixed up. It was not too difficult and everything else fell into range in the alignment process. of electronics, one boat anchor at a time! :)ĭon, I feel your pain. even tho we are both beyond the age of mandatory retirement. Stay tuned for the next hurdle, as I again contemplate buying a brand new $1000 generator rather than, as I've talked about before, constantly fixing my test equipment so I can fix equipment lol.īut I am now committed to getting this generator up and running properly. I added a bit of solder, and PRESTO! An oscillator. The soldering in this instrument, btw, appears to be done by a pro. The "light bulb" (in my head) started to go on. Push on the socket tab just the right way and it would come and go. Tube socket? No visible problem, wiggling the tube made no difference. as I checked pin 8, a sine wave magically started to appear and then went away. I decided to take one last tour around the tube socket with the scope. Getting desperate at this point (it's just a simple oscillator, eh?), and considering removing all components and reinstalling them (I'd already checked the wiring against the schematic for errors, thinking maybe it's one of those kits "that never did work". All well within spec.įullsizeoutput_980.jpeg Tested the resistors in and around the V1 circuit. Lit up just like the night lights of old. Didn't believe my Ohmmeter testing of the lamp off the cathode, so, being a 110V 3W bulb, I pulled it, and taking my life in my hands, put it across 110V with two clip leads. 1 cap between pin 6 and 1, even tho it was mylar and tested good. All within the margins of error, except plate voltage on pin 6, way off as expected due to the tube not oscillating.Ĭhanged the.
Checked all the resistance and voltage readings against the chart. Changed the electrolytic even tho the one in there was good. I tried 3 different tubes with no effect.
Nothing particular complex, except it wouldn't oscillate.
as stated in the manual "it's a Wein Bridge type" and in this case lamp stabilized. there's nothing magic about this oscillator. As an aside, there is NO PRICE TOO HIGH TO PAY for a legible schematic.for anything. Having received same, I decided that I might as well get back to this, since I actually need an FM stereo generator now. Firstly, thanks to all who helped me find a legible, and furthermore complete, assembly manual.