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In Reply to: RE: How to Test 8045G posted by Lee of Omaha on February 20, 2016 at 12:49:09
Lee
You will not be able to test that tube in a conventional tester..You have to run that up on dc power supply at 550v and about minus 45 to 50 on G1 and see what you measure for current across a 10ohm cathode resistor..You can even do this in a Dyna MK3 if you put SS diodes in to boost the B+ along with a 550v cap of course.
What I did for the last pair I rebuilt was to rewire it for KT90s and he is running KT120s as well because those have hefty filaments.
A friend you get for nothing,an enemy has to be bought
Follow Ups:
Thanks. This is for a customer's 3045 that has been converted. He wants to sell the 8045Gs so he wants to know whether they're still good. I appreciate the info.
We have a "killer" HP power supply that will do 600 volts and something crazy like one amp. We could rig that up with a C- supply.
Again, appreciate the info.
That will work..Just do a mathematical calculation for dissipation of the tube's power and you should be good.
A friend you get for nothing,an enemy has to be bought
In the stock Luxman 3045 the plates of the 8045G sat at 480 VDC and at a grid bias of -100 VDC, the idle current was 75 MA (neat the maximum rated plate disapation). A plate voltage of 550 and grid bias of -50 will destroy the tube in short order.
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