It has always been a good unit and worked well. I am not a dealer for this equipment, nor a surplus blow-out seller. I am an electrical engineer who has used this reliable piece of equipment for many years. It is time to pass the knowledge that can be gained from this instrument to a deserving individual who will truly appreciate its historical significance, and hopefully can use it to expand their own personal knowledge of electronics.
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Kikus Sep Tue 06, 3: The tubes called out on the schematic you posted are octals. The generator was capable of either sine or square wave outputs. I thought it was an Eicoand it is labeled as such. DavidH, Google [Bot]Johnnysan and 2 guests. Before powering it up I did a visual inspection manyal the circuitry and checked for any obvious shorts etc.
The sico minor reason for this is that if something goes wrong while testing boat anchors, for example, and because of their higher voltages involved I would prefer to repair the Eico over the more precise HP. I have four other pieces of Eico equipment. I checked the sine wave output distortion using my HP Distortion Analyzer. The document on the BAMA site has a second schematic reflecting the changes to the tuning circuit, but even that schematic contains a hallow state rectifier.
The square wave performance is OK and seems to be optimal around Hz. I never thought about it being a newer model. Previous topic Next topic.
May we help you read better. The output is high impedance and not meant to drive a speaker. If the socket is wired for a 6SJ7 it will appear between pin 2 and pin 7. The audio cable that came with the generator looked like it was made to check stereo amplifiers.
If the tubes were loose how did you decide which ones went where? I edited the original post to include the pics. If the 6SQ7 is a mistake and a 6SJ7 really belongs in there, the wiring will correspond to the schematic. Sep Mon 05, 8: I have one exactly like it. Apparently it was purchased and never used. Late model from I tried to hook this up direct to an old speaker to hear it, but got nothing. Page 1 of 1. I also have an older version from I think the s using the older octal tubes.
I will set about trying to trace out a manal on it. Books Support This Site: For a quick check you can just measure for the 6. Sep Mon 12, 4: This is an Ebay buy that I figured I would be replacing capacitors on, not trying to figure out what the thing even is! Eico or IS it? Yours is a 2 gang, which means all of the resistors in the tuning circuit are different also. The soldering and construction is nice work.
EICO 377 MANUAL PDF
Kajin I am ordering the correct tubes. If the tubes were loose how did you decide which ones went where? Sep Mon 05, 8: I am new to the hobby and am not real sure what to do now. A total of 5 tubes are used including a 6X5 rectifier. Are you sure this is the right number?
Oct Mon 24, 5: The output is high impedance and not meant to drive a speaker. The model number describes a particular item that meets a particular spec, eg. That oscillator will drive a speaker if you add a 70 volt line transformer to it. The op just reminded me Eio own a whole slew of those. This is an Ebay buy that I figured I would be replacing capacitors on, not trying to figure out what the thing even is!
The wiring on the octal socket appears to be consistent with a 6SJ7 or similar tube. I am ordering the correct tubes. I will set about trying to trace out a schematic on it. The dial accuracy is OK but not great. DavidH, Google [Bot]Johnnysan and 2 guests. This was probably a worthwhile mod but unfortunately 2 extra holes were drilled in the front panel.