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.
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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. I never thought about it being a newer model. A 6SJ7 manuao make sense and the socket wiring seems to fit as much as I can tell from the pic. I also have an older version from I think the s using the older octal tubes.
I have four other pieces of Eico equipment. The generator could not work if that is the case, since every pin is eifo between the two types. Exact same tube compliment. If the tubes were loose how did you decide which ones went where? Sep Mon 05, 9: Oct Mon 24, 5: They all test good though.
Eico did not play the model number-letter game like many other companies did. The tubes were loose and rolling inside the case when I got it. Sep Tue 06, 4: I tried to hook this up direct to an old speaker to hear eifo, but got nothing. I checked the sine wave output distortion using my HP Distortion Analyzer. The generator worked without doing any repairs. The Eico is also likely more forgiving. The 6FG7 replaces the 6SN7.
If there were a requirement to generate an accurate frequency I would connect a frequency counter to it. Yours is a 2 gang, which means all of the resistors in the tuning circuit are different also. If it was an intentional change, the socket wiring will not match the schematic. The only 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.
The version arrived in like new condition except for white oxidation on the cadmium plated steel chassis and the factory tag still on the handle. The soldering and construction is nice work.
The exact tube line up, internal parts, even the colors of the case and front panel could be different depending on when it was made. A copy of the correct manual for your generator may still come to light. A comprehensive manual is available on the BAMA website. As for yours, I think I see a diode on the terminal strip that the transformer secondary winding leads all connect to, eliminating the need for the rectifier tube.
The dial adjustment is broke on the inside and is visible in the picture. Related Articles
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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.
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!