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Old 18th December 2009, 10:55 PM   #1
tc4all is offline tc4all  United States
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Default 6GM8 Hickok test settings?

Does anyone know the tester settings for a Hickok tester 533 (or any other of theirs) for the 6GM8 tube? They would be a big help to me.
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Old 19th December 2009, 12:39 AM   #2
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6GM8=ECC86
From the Hickok 539B/C test data:
6.3V filament
seclectors:
EV-7608-0, bias=1.8v, press P1 range E
EV-2103-8, bias=1.8v, press P1 range E
Note: no gas test. Emission test only, OK above diodes/rectifiers OK on meter.
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Old 19th December 2009, 04:11 AM   #3
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ECC86 for my 600a says EV-7608-0 and EV-2103-0 bias 17 English 70 and OK above diodes OK mark
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Old 19th December 2009, 03:53 PM   #4
tc4all is offline tc4all  United States
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Thanks for the help. I'll give those a try tonight ... during the snow storm.
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Old 19th December 2009, 04:33 PM   #5
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Oops, Boywonder is correct. I made a typo. The second half is EV-2103-0
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Old 19th December 2009, 11:23 PM   #6
tc4all is offline tc4all  United States
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OK, so maybe I don't know enough about this but with my little knowledge, I never had problems testing any of my other tubes. If I use the settings you gave me am I only suppose to use the diode check? If so, none of mine, with those settings get into the good diode area. If I try to use the normal tube test (P4) I have to set the scale to the 15000 level and then the tubes really come up then the needle drops way back as I hold down the P4 button.
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Old 19th December 2009, 11:48 PM   #7
Bill_P is offline Bill_P  United States
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ECC86 for my 800a says 6.3 filament, EV-7608-0 and EV-2103-0, bias 17 English 70, and press P1 and OK above diodes OK mark. It also says make no gas test.
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Old 20th December 2009, 12:10 AM   #8
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The 6GM8 is a tube designed to operate with low plate voltage around 25 to 30 volts max. This is why testing is done with the P1 button as that applies low voltage to the tube under test. This is also needed to protect sensitive diode tubes. If you test with P4, this applies higher voltage then the tube was meant for and may overstress it. However, a tube that falls off under test is indicative of a weak one. I suspect that a strong 6GM8 would exceed even the 15K position of your tester.
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Last edited by HollowState; 20th December 2009 at 12:18 AM.
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Old 20th December 2009, 01:16 AM   #9
tc4all is offline tc4all  United States
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OK, that is what I thought was meant. So, if the settings hold true for my 533, and I am getting only 1100 on one tube and all of the rest just under 1000, I probably should find a couple more of these to buy.
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