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 Post subject: Eico meter pinning when used
PostPosted: Mar Wed 07, 2018 1:12 pm 
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Location: Long Island NY
My 666 meter pins? out when you test a tube.
Ecaps were replaced but it is still doing it when a tube is in the socket.

Any ideas?

Kirk

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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Wed 07, 2018 2:43 pm 
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Location: Latham NY
Does it pin on every tube tested? Did you adjust the 2 cal pots per instructions in the manual?


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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Wed 07, 2018 3:48 pm 
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It has been adjusted and it does it with all tubes.

:)

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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Wed 07, 2018 4:09 pm 
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Test the grid and plate potentiometers with an ohmmeter while turning the knobs.Either could be dirty or damaged,but my suspect for pinning would be the plate pot.


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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Wed 07, 2018 4:54 pm 
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I will try but this storm and the freezing shed may prevent me for a day :lol:

Kirk

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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Thu 08, 2018 12:34 am 
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Some of these pots have had the Tin Whisker disease and can cause trouble. Only way to check is disconnect all wires and check with meter from all terminals to casing.


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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Thu 08, 2018 2:19 am 
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Yes,tin whiskers in the calibration pots.Good point,Lou,I forgot about that little problem.It wasn't an issue with either of the 667s I had,but others haven't been as lucky.


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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Sun 18, 2018 4:12 am 
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I finally got into the shop and figured out the issue.
When you pull the lever to test the tube it pins the needle. If you dont pull the lever all the way it will test the tube just fine.
Do you think it is dirty? I cleaned it good but no change...

:)

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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Sun 18, 2018 1:00 pm 
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The lever probably operates some sort of switch. There is the possibility, due to contamination, or a mechanical issue, that such a switch is being pushed too far, at which point it shorts, or does something to the meter shunts? Reasoning: It seems odd that it can test a tube correctly, before the lever moves to its full travel?

For me, this can only be fixed by seeing it. I would, with the unit shut off, study the operation of the lever and its mechanical integrity. I have had a meter rebuilt after a loose screw in it caused a short.

Marc


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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Mon 19, 2018 3:20 am 
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Kirk

Even operating properly the EICO 666 meter can pin if a setting isn't right. To correct this I solder two 1N662 or similar diodes, parallel, back to back, across the meter. This will clamp the meter to around full scale. Without this the meter can pin hard.

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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Mon 19, 2018 11:11 am 
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Thanks all,
I will look at the switch. It tests but the switch has to be "almost" to the end.

If that does not help I will get some of those diodes :)

Kirk

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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Thu 22, 2018 6:31 am 
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Location: Dos Rios, CA.
Kirk:
Eventually after a few years my meter fried after pegging too much in service and I had to replace it.
For some reason 6AL5 types gave it real trouble, which caused me to get another tube tester (some years ago, I have many testers now)
I would get those diodes recommended soon, if the Eico is your "go-to" tester, I was lucky to find the correct Eico meter
found installed in a Sylvania tube tester and I don't use the Eico much anymore to worry about it.
Best of luck,
Kent


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 Post subject: Re: Eico meter pinning when used
PostPosted: Mar Thu 22, 2018 2:54 pm 
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Thanks,
It is actually unused by me. I am selling it but dont want to sell it like that.
I am a little weary about how to add the diodes with my limited knowledge so I may have to sell it that way and add this info to the listing..
Ill look closer today since it is a winter wonderland out there...

:)

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