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#16
11-05-2008, 05:00 PM
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Really neat old timer. Wonder if you could figure out the power requirements and get it up and running? Cabinet looks like it would be easy to restore with the most difficult being the warped top and would clean up nicely.
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#17
11-10-2008, 11:49 AM
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The WD-11 tube is very delicate. Filament voltage is only 1.1 volts, less than a single flashlight battery, or dry cell back in the day (filament was lit through a rheostat on the radio to compensate for battery running down.) The attached shows the basing diagram and tube characteristics. I wouldn't use an ohmmeter on it directly because you don't know what voltage it might impress on the filament. Safest way would be to put a resistor of a few hundred ohms in series with the ohmmeter and check the filament that way. Any reading at all would mean you had continuity. At the same time you could check between the other elements to make sure none of them was shorted to another.
If you can clean the set up and then draw the circuit diagram, we could advise how to try it out. Should be pretty simple. Battery requirements should be 1.5 volt D cell for the filament, and three 9-volt batteries snapped together to yield 27 volts for plate. Reece http://www.nj7p.org/Tube4.php?tube=wd11
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Reece Perfection is hard to reach with a screwdriver. Last edited by Reece; 11-10-2008 at 11:57 AM. Reason: Link added.
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#18
11-10-2008, 12:04 PM
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It's definately a homebrew. The tube is a WD-12. The WD-11 was a long pin only tube. Teh WD-12 is basically a wd-11 mounted in a UV style base. Usefull for folks wanting to switch to dry cell operation of there uv-201a equiped sets.
THe tube is not as valuable as a brass based wd11 because even though they are more rare they are not as in big demand. The can be had for about $60. Steve
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looking for technics turntables to gramophones.
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#20
11-16-2008, 04:36 PM
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That would make a great restoration project (a challenging one at that).
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Vintage System: Fisher 500B, Technics SL Q202 (Ortofon VMS 30), Tandberg 3000X, Denon DCM 290 through a pair of Apogee Centaur Minors Workshop System: Fisher 500-S, Pioneer PD M-400 through a pair of Acoustic Research AR 8BXIs New project: overhaul of a Scott 340B
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#21
11-20-2008, 03:08 PM
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Quote:
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Summer's here and the time is right. 
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#23
11-20-2008, 09:23 PM
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A VOM only puts out current when it is measuring resistance. Since the circuit must be de-energized when measuring resistance, and you need a source of current in order to measure the voltage drop across the resistor, the VOM/VTVM/DVM/DMM provides it.
The amount of current used is miniscule, and it's highly unlikely you could cause damage with it, unless you're trying to measure continuity through your PC's chipsets. The battery used to power the multimeter is NOT passing that full voltage through the probes.
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I may be growing older, but I refuse to grow up. 
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Linear Mode
