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  • #3481
    David Schuh
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    After spending an evening reading the classic “Electronic and Radio Engineering” by Terman I jumped into measuring plate voltages and currents. Didn’t take long to find the 1st audio plate to be low which was fixed by replacing one of the two bias resistors. I now have volume and hear stations. After a first pass on IF alignment I have all the volume I want. The “magic eye” tube doesn’t appear very bright so that’s the next job. I’m going to get the tubes tested Monday. I think there’s still a lot more that needs attention but at least its working and I’m happy with the progress given this is my first restoration in the tube world.

    Forum Participant

    age does seem to dim down old eye tubes, but I just thought I’d mention in case you didn’t know, that a lot of times there is a resistor inside the eye tube socket. Someone else may be able to enlighten you on what that resistor does exactly, but I think it is normally a high resistance , like 10 or 20 K or something. i don’t know if changing it will help or not but in case you find yourself wondering where it is , look in the socket. You can probably measure it without even opening up the socket if you cn figure out which pins it connects between.


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