tube tester

TJ · 30th August 2004, 04:44 PM

Hv anyone built a working tube tester ? thank

sonix · 30th August 2004, 05:58 PM

click

sonix

Sch3mat1c · 30th August 2004, 07:18 PM

Yeah, it's called an amplifier, stick in the tube and measure voltages and currents...

Tim

hagtech · 2nd September 2004, 06:56 AM

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

djmiddelkoop · 3rd September 2004, 07:44 PM

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.

gsmok · 4th September 2004, 08:37 AM

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

.

gsmok · 4th September 2004, 08:42 AM

In my last post I forgot about the link:
simple tube tester

Sch3mat1c · 4th September 2004, 09:14 AM

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

EC8010 · 6th September 2004, 01:46 AM

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.

alejo · 5th April 2005, 01:32 PM

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

30th August 2004, 04:44 PM	#1
TJ diyAudio Member Join Date: Sep 2001 Location: UK	tube tester Hv anyone built a working tube tester ? thank

30th August 2004, 07:18 PM	#3
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Yeah, it's called an amplifier, stick in the tube and measure voltages and currents... Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

2nd September 2004, 06:56 AM	#4
hagtech diyAudio Member Join Date: Mar 2002 Location: Hawaii	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

3rd September 2004, 07:44 PM	#5
djmiddelkoop diyAudio Member Join Date: Feb 2003 Location: Noord-Holland	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. __________________ Music is the best F.Z.

4th September 2004, 08:37 AM	#6
gsmok diyAudio Member Join Date: Jul 2004 Location: Warsaw, Poland	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 . __________________ gsmok

30th August 2004, 05:58 PM	#2
sonix diyAudio Member Join Date: May 2004	click sonix

4th September 2004, 08:42 AM	#7
gsmok diyAudio Member Join Date: Jul 2004 Location: Warsaw, Poland	In my last post I forgot about the link: simple tube tester __________________ gsmok

4th September 2004, 09:14 AM	#8
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	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 __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

5th April 2005, 01:32 PM	#10
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	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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