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#1
01-02-2013, 10:41 AM
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Superior Instruments 660-A signal generator
Does anyone have a schematic for this unit or a working example? There's three tubes. One looks like a 6CB6 but has only a 6-digit number stamped on its shoulder "6B1000", a 6C4 and a JAN-CNU 7193, octal triode with two top caps - one plate, one grid tied together and funtioning as the rectifier.
See link for photo http://www.ebay.com/itm/Superior-Ins...-/300807987985 It works OK but does not modulate a tone onto the output. I see two transistors in the audio output circuit, one of which broke off its leads. The transistors are Raytheon CK721, an early PNP-germanium type. I can replace them with ECG-102s and see what happens, but they were added later by the looks.. 
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#3
01-02-2013, 02:08 PM
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Not similar, the 670 A is a different machine altogether, and more like a TV analyst in that it also has FM and generates Horiz and Vert sweep signals.
The 660-A is very basic, just an AM unit ranging from 100khz to 13 mhz. I have a Hickock 277X that has many more features
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#4
01-02-2013, 08:22 PM
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That was equipment that was sold on the back cover of Popular Electronics. To me, It was comical to see what they used to make some of this equipment. I have a TV pattern generator, that is simular to a color generator, only produces horizontal or vertical lines. It used that high frequency triode and two acorn tubes.
I have a Genometer that has that 6B1000 and someother dual triode type and that rectifier 7193. Some of the other parts are Philco surplus. I bought it for the knobs and the power transformer.
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#5
01-23-2013, 11:57 AM
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A little persistence turned this up;
This one is ORIGINAL and has two 6BE6 and a 6H6 as the rectifier....interesting. http://www.youtube.com/watch?v=mqIoHR7pq6U My unit was heavily modified with an on-board, fixed frequency modulator powered by a battery. Not only that, the attenuator switch was replaced with a pot to adjust the modulation level. It seems like finding a schematic to return it to original may be a long shot. I just plan to do the alignment as per the video using a frequency counter.
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