Olson TE-209 Audio Generator, Sine and Square Wave - diyAudio
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Old 20th July 2014, 08:46 PM   #1
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Default Olson TE-209 Audio Generator, Sine and Square Wave

Does anyone know where I can find a schematic and/or manual for this unit?

Thanks,

John
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Old 21st July 2014, 03:09 PM   #2
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I suspect that this audio generator may have been released under more than one brand/model name/number, so here is a picture to help identify it.

Click the image to open in full size.

Thanks for any leads,

John
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Old 22nd July 2014, 04:28 AM   #3
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John,

I can't get your picture to display.

I am not familiar with that model by Olson. If I recall correctly, Olson was a bargain retailer of hobby electronics and hi-fi equipment. At the national level they were similar to Lafayette Radio, and Burstein-Applebee; there were also some regional competitors. I think they all disappeared in the early 1970's.

As you noted, it is not unusual for a basic design to be produced or marketed by several retailers. Sometimes the only differences are front-panel paint and markings; in other cases there may be minor changes in the circuitry. (I think there was a thread on this Forum last winter regarding an obscure VTVM, and the owner discovered that the example circuit published in the RCA Tube Manual for a dozen years or more was almost identical to his unit.)

Can you offer any additional clues about your generator? Approximate age? Tube or transistor? A view inside the case?

Dale
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Old 22nd July 2014, 06:38 AM   #4
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My guess is that the oscillator is similar to the Lafayette TE-22. Manual including circuit diagram here:
http://bama.edebris.com/manuals/tech/te22


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Old 22nd July 2014, 03:16 PM   #5
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dchisholm: It is a tube unit--I'm sort of a tube guy. In any case, I will post more pics and some specs tomorrow.

consort_ee_um: Oh THAT looks interesting. Even if it is not an exact match, it may help me diagnose my model.

all: This is quite a well-made little audio generator. The problem I am chasing is this: Although it produces near perfect sine-wave output, it flat-lines when I flip the switch to square wave.

Thanks to all!

John
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Old 23rd July 2014, 06:32 AM   #6
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Quote:
Originally Posted by Listen View Post
dchisholm: It is a tube unit--I'm sort of a tube guy. In any case, I will post more pics and some specs tomorrow. . . .
I'll give you 50/50 odds the oscillator is a Wien bridge circuit, and probably quite similar to models by Heath and Eico from the 1950's and 60's. Schematics for those instruments should be readily available.

Dale
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Old 23rd July 2014, 03:37 PM   #7
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Exactly correct, it is a Wien bridge and the Olson TE-209 appears to be an exact clone of the Lafayette TE-22.

Someone has rewired the heater circuit for v2 and replaced the 6AQ8 with a 12AT7. I hope to restore it the factory configuration and function tonight.

I suspect that v2 first clips one side and then the other of the sine wave to create the square wave output, so trouble shooting should be easy.

Thanks,

John

Quote:
Originally Posted by dchisholm View Post
I'll give you 50/50 odds the oscillator is a Wien bridge circuit, and probably quite similar to models by Heath and Eico from the 1950's and 60's.
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Old 24th July 2014, 02:34 AM   #8
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First, thanks to all. Got home and swapped in the correct tube after rewiring the heaters properly; still no square-wave output. Traced it back and realized that the square/sine switch was wired backward. Swapped two wires and voila! Checked the alignment and I suspect that it is running better than spec. In any case, after this unit warms up for a half hour or so, it is a nice, stable, accurate audio generator all across its bandwidth that will be a joy to have on the bench.

Best,

John
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