DIY Audio Projects Forum

Hello to all
Iam a technician of old TV radios I want to know if a tube is working well or not working. test the short circuit, leakage and emission.
Witch you advise me tube tester or curve tracer
the eico 667 is good but does not test compactons tubes
Best regards

Hi @Atifmo,

I have several tube testers, but unfortunately, none of them can test compactron tubes :



I had a Knight 600, and this one has the compactron socket, but this not a premium tube tester (rather inconclusive).

Cheers,

-tbln.

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https://guilhemamplification.jimdofree.com/

Hi, I use a tester, but then I have plenty of each type of tube I use to swap one if in doubt. Looking at the photo...the H600 looks identical to the TV7/D/U I have. A rather modest device, but does the job.

Good listening
Bruce

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Some of my DIY Tube Amplifier Projects:

• PoddWatt: 5751 / EL84 Push-Pull DIY Tube Amplifier Project
• OddBlocks: KT88 Push-Pull DIY Tube Amplifiers (Mono Blocks)
• ForeWatt: ECC802S (12AU7 / ECC82) DIY Tube Preamplifier Project
• GrooveWatt: Tube (Valve) RIAA Phono Preamplifier Project

You can test compactron tubes on the 539c with a ca4 adapter module. They come up on the bay every so often for about a hundred bucks or so. I picked one up not too long ago.

The eico 666 also has an adapter for testing compactron tubes. The big drawback to the 666 though is there is a short in the tube it will pop the fuse. I put a breaker in mine so that I wouldnt have to take out a zillion screws just to replace the fuse.

The Eico 667 does, in fact, test compactrons. I am the author of the "EICO 667 Tube and Transistor Tester" article located in the DIY Audio Projects Test Equipment & Tools section ( http://diyaudioprojects.com/Testeq/EICO-667/ ) and the "Vacuum Tube Tester - helpful hints" thread. The images you see in the 667 article, I have a tube setup for testing. That tube is a 6T9 compactron. You can find the tube chart for the tubes the 667 can test at the very bottom of that article.
In the life of the vacuum tube technology, compactrons were the "late entry" and it is possible there are some compactrons that are not listed. This doesn't mean it can't be tested, just requires a little more work to figure out the settings that would effectively test the tube. You would need actual tube data from the tube manufacturer. You can find most of these data sheets @ Frank's Electron Tube pages ( http://tubedata.milbert.com/index.html ). You would also need a deep understanding of the various controls of the tester.

As in life, compromises are necessary. As such, one of the compromises with the Eico 667 from its older sister, Eico 666, was the loss of the ability to test 4, 5, & 6 pin bottles natively - they can be tested with an adapter. That trade off allows the Eico 667 to support the duodeca (12 pin) tube - the base for a great number of compactrons - natively.

Cheers!

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The key to a successful build is to keep the smoke IN the circuit.
-Les

We cannot solve our problems with the same thinking we used when we created them. - Albert Einstien
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LM380 Bridged Guitar Amp, Oatley K301 Phono Pre-amp, Oatley K272 Headphone Amp, Tube proto-board