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In Reply to: RE: National 5ar4 ,,, is it a Bendix? posted by Steve O on October 13, 2015 at 15:21:39
It is not a Russkie tube and looks just like the Bendix 6106. I was wondering if anyone actually assessed the tube to see if it is a 5ar4 or a 5y3. A 5y3 has a voltage drop of over 10% while the 5ar4 is only 3%. I am not sure what other parameters can be measured. regards, Dak
Follow Ups:
...if what you have is really a 6106 it's clearly not a 5AR4. They have significantly different characteristics.
If you have a halfway decent tube checker, set up for a 5AR4 and test. It will test below 5AR4 reject point if it's a 6106 (just tried this w/6087 which is similar). Another tube tester check: test as 5AR4 but at 4.3V on filament. Should test well above 5AR4 reject point if truly a 5AR4, well below if it's a 6106. Best non-functional test would be to set up by the book using reg DC supply and meas voltage drop at spec current.
This is a mil spec, slow-warmup 5Y3WGT rectifier. It will not handle current demands of a true 5AR4 rectified unit.
AFAIK, there are no mil spec versions of the GZ34 (5AR4). There are some mil spec "5V4GA" Philips ECG tubes, which are really 5AR4. I haven't seen seller's ad on EBay, in several years.
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