Good evening I recently got one of these equipments in bad condition, because the tubes and the transformer T1 and the coil L1 were removed. Do you have any information about the value in mH or uH of this coil or a.f. choke? I like this equipment and I would like to restore it.
Good video. I found when doing alignment with older test equipment, a frequency counter help full. The output of these older generators are adequate. Calibration is not as crucial if the frequency counter is used.
Are you sure the " foil side" is the lowest amplitude? I thought the highest amplitude was the outer foil side, because there's more surface area to detect the signal from our body. I'm not 100% certain and want to make sure.
There are two foils, inside and outside one. If you consider the scope well grounded, i.e. the scope ground lead represents the ground and the probe tip is the sensor, where would you think your fingers (“antenna”) has a better capacitive coupling? It is the outer foil, closer to the jacket, of course. So as long as you are not grounded, but your scope is, the outer foil is the one that shows the higher noise, as observed at the wire end. You could make it a little more sensitive, if you have the good ground at the scope return lead, rather than via scope power plug. And hope you have not defeated the protective ground of the scope in any chance - not using an isolation transformer in this particular test?? I hope this clarifies the reasoning…
Thank you both for brining up a concern and commenting on it. The last thing I want to do is pass on a bad advice, btw the oscilloscope is grounded. I didn't think about what the results would have been on a isolated transformer.
@@InssiAjaton Thank you so much for the clarification! I had gone through all the capacitors I have stocked, tested & marked them. After I watched this video, I thought I had marked them all wrong AND I have installed several in vintage electronics I've been repairing. I'm thankful mine are marked & installed correctly! lol
This whole foil side is false information is drugged up by pot head guitar amplifier players and enthusiasts who think a leaky cap provides a warm sound. When in fact that warm sound comes from the early stages of tube red plating , that will take out the transformer next in line. Yes foil side was an issue 50 years ago. Todays modern caps are of an entirely different construction mode. There is no foil side anymore! Modern caps have parallel layering where vintage caps were serially wound like a coil.
Yes some resistors go real high in resistance and others hold their value quite well! any out of spec parts must be replaced! the old capacitors paper foil types are generally all leaky to some extent! Now for the waveform being not nice and clean as one would normally expect this is O.K. to some extent as with these signal generators like this and Heathkit these units are designed to use a slightly erratic waveform in order to have harmonics of the base frequency to generate the frequencies of the upper one or two frequency bands. So don't get too worried about the waveform shape or cleanliness! just as long as the general base frequency is there your O.K.
Excellent restoration. Thanks for sharing. Best wishes.
Good evening
I recently got one of these equipments in bad condition, because the tubes and the transformer T1 and the coil L1 were removed.
Do you have any information about the value in mH or uH of this coil or a.f. choke? I like this equipment and I would like to restore it.
Good video. I found when doing alignment with older test equipment, a frequency counter help full. The output of these older generators are adequate. Calibration is not as crucial if the frequency counter is used.
I couldn't agree more, i found my self setting the freq with the frequency counter.
Are you sure the " foil side" is the lowest amplitude? I thought the highest amplitude was the outer foil side, because there's more surface area to detect the signal from our body. I'm not 100% certain and want to make sure.
There are two foils, inside and outside one. If you consider the scope well grounded, i.e. the scope ground lead represents the ground and the probe tip is the sensor, where would you think your fingers (“antenna”) has a better capacitive coupling? It is the outer foil, closer to the jacket, of course. So as long as you are not grounded, but your scope is, the outer foil is the one that shows the higher noise, as observed at the wire end. You could make it a little more sensitive, if you have the good ground at the scope return lead, rather than via scope power plug. And hope you have not defeated the protective ground of the scope in any chance - not using an isolation transformer in this particular test?? I hope this clarifies the reasoning…
Thank you both for brining up a concern and commenting on it. The last thing I want to do is pass on a bad advice, btw the oscilloscope is grounded. I didn't think about what the results would have been on a isolated transformer.
@@InssiAjaton Thank you so much for the clarification! I had gone through all the capacitors I have stocked, tested & marked them. After I watched this video, I thought I had marked them all wrong AND I have installed several in vintage electronics I've been repairing. I'm thankful mine are marked & installed correctly! lol
@@Almostdone0 We ALL make mistakes and I'm thankful "InssiAjaton" helped both of us and others
This whole foil side is false information is drugged up by pot head guitar amplifier players and enthusiasts who think a leaky cap provides a warm sound. When in fact that warm sound comes from the early stages of tube red plating , that will take out the transformer next in line. Yes foil side was an issue 50 years ago. Todays modern caps are of an entirely different construction mode. There is no foil side anymore! Modern caps have parallel layering where vintage caps were serially wound like a coil.
Yes some resistors go real high in resistance and others hold their value quite well! any out of spec parts must be replaced! the old capacitors paper foil types are generally all leaky to some extent! Now for the waveform being not nice and clean as one would normally expect this is O.K. to some extent as with these signal generators like this and Heathkit these units are designed to use a slightly erratic waveform in order to have harmonics of the base frequency to generate the frequencies of the upper one or two frequency bands. So don't get too worried about the waveform shape or cleanliness! just as long as the general base frequency is there your O.K.
Correction 1964