• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

HeathKit W-2: Missing Tube

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You are not missing any tubes. The W2 uses 2 6SN7 and 2 5881, and you have all 4 tubes .

Back in the old days octal sockets were often used as connectors for power supplies etc.

I believe that is the case for this amp, although I have never owned one and I dont have a picture of one connected correctly for a W2. But the Heath W3 dual chassis amp does use the octal socket in that location as the power supply connection.
Here is a picture
http://www.heathkit-museum.com/hifi/hvmw3-am.shtml

It appears from your pictures that this amp has been modded and the power supply is hard wired into the amp. Maybe a previous owner did not like the octal connector.
 
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