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

[Richard Knoppow]

----- Original Message ----- 
From: "Ray LaRue" <w4byg at att.net>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Sunday, December 12, 2010 2:28 PM
Subject: [Test-Equipment] Eico 667 Is there a way to check 
performance?


>I have an Eico 667 that hasn't been used in a number of 
>years.  I
> brought it back up very slowly and it appears the filters 
> are OK.  Power
> supply ripple seems nominal.
>
> However I recently had cause to check a 6AQ5.  It barely 
> moved the
> "merit" needle.  I pulled another
> (used) one and it checked the same.  Altogether I checked 
> 7 or 8 6AQ5's
> (all pulls).  They all barely moved the needle in the same 
> way.   I find
> it hard to beleive they were all that bad.
>
> Other than buying a new 6AQ5, which may not be needed 
> should the tube
> checker be bad, does anyone know of a way to check the 
> performance of
> the 667?
>
> Your attention is appreciated,
> 73,
> Ray, W4BYG

     A assume this is a tube tester. Have you tried in on 
any other kind of tube? Can you find a handbook for it at 
BAMA or somewhere? Dynamic transconductance testers have a 
tube or tubes in them operating as an oscillator, perhaps 
ther tube in this one is weak.
     It IS possible to have several old tubes which are all 
weak but not too likely that they all read exactly the same.


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