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None of the tubes you listed belong in there. Silicon diodes are used for the power supply rectifiers instead of a 6X5. They all test good though. What in the heck did I buy? Late model from I tried to hook this up direct to an old speaker to hear it, but got nothing.

Audio Generator Equipment EICO Electronic Instrument Co.

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 way I have it in the photos is the way that I tried it first, with the 6BQ5 in the “north” socket, which did produce a recognizable sine wave, though not very pretty. The exact tube manuual up, internal parts, even the colors of the case and front panel could be different depending on when it was made.

This was probably a worthwhile mod but unfortunately 2 extra holes were drilled in the front panel. Sep Tue 06, 5: The Eico is also likely amnual forgiving.


May we help you read better. I did not have a real requirement for another audio generator but the price was right and Eifo like collecting old test equipment. The only manuap 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.

When I opened it up, it was obvious this thing has taken a fall of major proportions. 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 generator worked without doing any repairs.

Audio Generator 377

The soldering and construction is nice work. The distortion was tested across a ohm load. Eico did not play the model number-letter game like many other companies did.

I have two versions of the but not this one and have no data on it. Sep Tue 06, 3: The audio cable that came with the generator looked like it was made to check stereo amplifiers.

It came with 3 spare tubes used and an audio cable. The schematic you posted is of mxnual oldest variant which used a 4 gang variable capacitor. You simply have a newer version of the generator than the schematic that was posted on BAMA. I thought it was an Eicoand it is labeled as such. I never thought about it being a newer model.

The 6FG7 replaces the 6SN7. Eico or IS it?

Thanks for the info and the ideas. I hoped that since the original version was the same tube, that switching the two wouldn’t be catastrophic I readily admit that may not have a been a fair assumption and I may have just got lucky I also brought it up slowly on my current limiter and Variac, while looking at the signal with a scope, and watching the tubes. That oscillator will drive a speaker if you add a 70 volt line transformer to it.


The tubes called out on the schematic you posted are octals.

However, Eico’s documentation always matched the item that was shipped; your generator came with a manual that reflected the tube line-up in it. Sep Tue 06, 4: The dial adjustment is broke on the inside manial is visible in the picture.

I power it up slowly using a Variac on the ac line. Last edited by ’66Cuda on Sep Tue 06, 4: Aug Wed 30, 5: The generator could not work if that is the case, since every eic is different between the two types. Before powering it up I did a visual inspection of the circuitry and checked for any obvious shorts etc. The dial accuracy is OK but not great. Edited to include the pics A 6SJ7 would make sense and the socket wiring seems to fit as much as I can tell from the pic.

Sep Tue 06, Now I’m curious to find out if they were octal.