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Old 2nd May 2013, 08:27 PM   #11
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Join Date: Mar 2011
Location: St Louis, Mo
Originally Posted by tubelab.com View Post
I am not familiar with the 202C.

The 200AB used a . . .

The 200CD "wide range oscillator" had a . . .
Very interesting that slightly different instruments within the same model series used significantly different tube complements (and presumably different circuits)! I would have expected to see relatively minor tweeks in the passive components.

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Old 3rd May 2013, 12:55 AM   #12
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Join Date: May 2011
Location: Virginia
Say for example that the secondary was designed to produce 350 VAC from 110VAC, I think I get that it would produce 398VAC if the line voltage was raised to 125 VAC. I'm not very good at this though...

I do know this is pretty big problem in old tube guitar amps and such audio gear. I assume it's the same with old test equipment.
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Old 30th May 2013, 08:20 PM   #13
ODougbo is offline ODougbo  United States
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Location: Maryland USA
Had to bring out old scratchy (back up generator) I did oil the bearings a few weeks ago and it works much better, still sounds like something is scraping when turning the dial.
This look the same on the outside, all different inside, smaller tubes, etc. I don't think I can switch any parts. It does seem to be loud and clear as far as tones.

I don't see me rebuilding one of these; how much is a good one?

I see ebay has 100s of them - all sizes.
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