[Boatanchors] Question for Tube Testing: 6DJ8

drossetti at comcast.net drossetti at comcast.net
Sat Mar 3 14:19:53 EST 2012

I did some research and found a number of Hickok testers have challenges  
testing this tube. Seems related to the tubes high gain, inner tester  
harmonics, or that a number of Hickok testers use a high grid voltage (2.5  
to 5 volts). The 605A uses 2.5 volts. A search using 6DJ8 and Hickok will  
yield you a number of hits with further details.

Dave Rossetti 
Connected by DROID on Verizon Wireless

-----Original message-----
From: William Morton <w_b_morton at hotmail.com>
To: boatanchor <boatanchors at puck.nether.net>
Sent: Thu, Mar 1, 2012 15:21:26 GMT+00:00
Subject: [Boatanchors] Question for Tube Testing:  6DJ8

Hello All,
I have a Tek 545A which has a boatload of 6DJ8 tubes in it.  I took some out  
to test on my Hickok 605A, using the settings in a consolidated Hickok setup  
document found via a web search.  All of the tubes tested low or nearly  
dead.  Further searching found various discussion threads mentioning the  
difficulty of testing 6DJ8 tubes on Hickoks, but no in-depth details.  I  
have a Seco 107 that also has settings for 6DJ8, retested some them and they  
were fine (unless the Seco was lying to me).
My question is:  Why are these difficult to test on Hickoks and are these  
difficult to test in general?
Also, in my web wanderings I also found information regarding E88CC, which I  
thought was a typo for the European designation of the 6DJ8 (ECC88).  The  
numerical designation for E88CC is 6922.  Now it looks like there are 4  
designations for the same (?) tube: 6DJ8/ECC88/E88CC/6922.  Ah, so much to  
Have a great day.  Helpful comments would be most appreciated.
Best Regards,
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