[Heathkit] Testing the SB-401's 6AV11

[Ian Wilson]

The 6AV11 contains three identical (apart from capacitances) triodes.
So a sanity check on the settings for a tube tester would be that the
voltages set/meter readings expected should be the same for all 3 triodes.

If those are OK, I would compare the setup with those for the 6D10.
This has the same basing at the 6AV11, and also contains 3 identical
triodes (although hi-mu).

I would expect the pin assignments on your tester to be the same for the
6AV11 and the 6D10. And I would expect the settings for each section
of the 6AV11 to be the same.

The only tester I have data for is the IT-17. This uses the same pin
assignments
for the 6AV11 and 6D10; and uses the same voltage settings for each section
of the 6AV11, as you would expect.

Hope this helps...

73, ian K3IMW




On Tue, Jun 24, 2014 at 8:52 AM, jack m <oldvette at hotmail.com> wrote:

> I have 4 spare NOS/NIB 6AV11 triple triodes for my SB-401's which test
> perfectly on my TT-1A tube tester.  All 3 triode sections of each tube are
> within 5% and well over the stated test minimums.
>
> I've tested the same tubes on my EICO 666 tester using the 610 compactron
> adapter and the latest published Coletronics test data.  Triodes 1 and 2
> test good at 110 to 120 for each of the 4 NOS tubes, but Triode 3 does not
> read properly on ANY tube - most likely from erroneous tube setup data.
>  Checking similar tubes with the 12BY basing diagram (the 6K11 and 6Q11
> compactrons), these tubes call for entirely different section setups
> according to the Coletronics data.
>
> After an hour of freezing my brain and cross-checking with the 1975 RCA
> tube manual, I thought I would ask if anyone else has run into this
> situation with the Eico 666, and perhaps learn of a more suitable test
> setup for the 6AV11.
>
> I acquired the 666 to avoid lugging the TT-1A boat anchor between
> locations for obvious reasons, but would like to have more confidence in it
> - even though the adapter and compactron pin key change schemes are a real
> PITA when compared to the TT-1A.
>
> Thanks for the help!
>
> Jack  W3RU
>
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