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Old 30th August 2004, 04:44 PM   #1
TJ is offline TJ
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Default tube tester

Hv anyone built a working tube tester ? thank
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Old 30th August 2004, 05:58 PM   #2
sonix is offline sonix  Germany
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Old 30th August 2004, 07:18 PM   #3
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Yeah, it's called an amplifier, stick in the tube and measure voltages and currents...

Tim
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Old 2nd September 2004, 06:56 AM   #4
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Default Yeah, I made one

I call it the VacuTrace. Took me forever to design because for some stupid reason I decided to do it entirely analog. Should have put an 8-bit micro in there to make things easier. But hey, it works very nice. Super useful for matching tubes. Exactly.

jh
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Old 3rd September 2004, 07:44 PM   #5
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I've once built one for a friend from Glass Audio, but don't remember which issue.
It works fine, checks for noise, distorsion, amplification.

Dick.
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Old 4th September 2004, 08:37 AM   #6
gsmok is offline gsmok  Poland
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Very simple tube tester for EL34, EL84 and ECC83 (12AX7).
Some passive components and external universal meter.
You can build it just in one hour
Schematic diagram is self explanatory (I hope because description is in polish .
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Old 4th September 2004, 08:42 AM   #7
gsmok is offline gsmok  Poland
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In my last post I forgot about the link:
simple tube tester
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Old 4th September 2004, 09:14 AM   #8
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Check the tube for shorts BEFORE plugging it in to something like that.

My Eico 625 just applies a current-limited supply to all electrodes except cathode and heaters, so it kinda tests emission as much as anything... will tell you if your tube is really in the pits though.

Tim
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Old 6th September 2004, 01:46 AM   #9
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by Sch3mat1c
My Eico 625 just applies a current-limited supply to all electrodes except cathode and heaters, so it kinda tests emission as much as anything... will tell you if your tube is really in the pits though .
Eek! The grid is closest to the cathode, so it has the most influence on the electric field and will draw most of the current, but it's not designed to dissipate power. Read what Tomer has to say about valve testers in his "Getting the most out of vacuum tubesz" book. He was in a position to know, and his conclusions about most testers are frightening.
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Old 5th April 2005, 01:32 PM   #10
alejo is offline alejo  Argentina
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Default build tester

I find lots EL84/6BQ5 old valves (arround 200 units), in the box are used and new, all mix.

I want test 1 to 1, but I dont a tube tester.; search in last topics:

Sch3mat1c say _build amp plug the tube and measure voltages and currents...Check the tube for shorts BEFORE

ok. but How I check for the tube shorts ???

Gsmok put link for simple tube tester, ok is god idea but no limits currents, how upgrade this schematics to limits currents, in plate and grid?

thanks.
alejo
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