[Test-Equipment] Eico 667 Is there a way to check performance?

[Richard Knoppow]

----- Original Message ----- 
From: <WA5CAB at cs.com>
To: <test-equipment at mailman.qth.net>
Sent: Sunday, December 12, 2010 7:45 PM
Subject: Re: [Test-Equipment] Eico 667 Is there a way to 
check performance?


> There is also another possibility no one has yet 
> mentioned.  If the tester
> returns expected results on several each of several other 
> type tubes there
> may be a never corrected typo in the setting charts.  This 
> happened with the
> I-177 and the TV-7's.  Every 1R5 I (and a number of other 
> people) have ever
> tested in either model tester either fails or barely 
> passes.  Several of us
> finally concluded the the chart call-out for the meter 
> range switch was
> probably wrong.  Switching the range switch one step 
> higher in sensitivity gives
> about the sort of reading relative to the minimum stated 
> value as one sees
> with most other NOS tubes.
>
> In a message dated 12/12/2010 9:32:45 PM Central Standard 
> Time,
> k4pf at juno.com writes:

    I did point this out in my reply but it may have gone to 
the original poster and not the list. I ran into the same 
thing with my Weston tester for a couple of tubes where the 
settings were wrong. There is an update for this tester on 
the web and the odd thing is that one of the "corrected" 
settings on it is wrong and the original chart settting is 
right! I suggested testing other tubes but also the tester 
relies on a solid state rectifier, which may be a selenium 
stack, and could be bad. Although it is a mutual conductance 
tester is does not seem to have any active components in it. 
I have not analysed the circuit but perhaps it uses the line 
as a source of AC for measurement. It also has a transistor 
testing function. BAMA has the instruction manual and tube 
chart updates. There is a schematic but no service data, the 
owner being advised to send the unit an approved repair 
station for service.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com