How to match tubes?

pftrvlr · 12th August 2007, 04:44 PM

Hi,

I want to find a matched pair of 6c19 from a bunch of 20. But I don't have a tube tester. All I have are DMM and o'scope. What is the best way of mathing them?

ak_47_boy · 12th August 2007, 06:53 PM

You can make a temporary tube tester out of the parts you would use for an amp and your dmm.

Dave Cigna · 12th August 2007, 08:59 PM

If you have a working circuit in which you intend to use them, then plug in each tube and measure the cathode, plate, and grid voltages with no signal. (The grid voltage can give an indication of grid current.)

If you have a signal generator (could use a test CD or even the sound card in your computer) then you can further rank the tubes by mu. Apply a signal to the grid and use your oscilloscope to measure the signal level at the plate.

12th August 2007, 04:44 PM	#1
pftrvlr diyAudio Member Join Date: Feb 2007 Location: SoCal	How to match tubes? Hi, I want to find a matched pair of 6c19 from a bunch of 20. But I don't have a tube tester. All I have are DMM and o'scope. What is the best way of mathing them?

12th August 2007, 08:59 PM	#3
Dave Cigna diyAudio Member Join Date: Oct 2003 Location: Finger Lakes, NY	If you have a working circuit in which you intend to use them, then plug in each tube and measure the cathode, plate, and grid voltages with no signal. (The grid voltage can give an indication of grid current.) If you have a signal generator (could use a test CD or even the sound card in your computer) then you can further rank the tubes by mu. Apply a signal to the grid and use your oscilloscope to measure the signal level at the plate. __________________ January 20, 2009: Bush's last day

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12th August 2007, 06:53 PM	#2
ak_47_boy diyAudio Member Join Date: Sep 2006	You can make a temporary tube tester out of the parts you would use for an amp and your dmm.

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