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Are you sure the rectifier tubes are 6AX4 in the Emerson? I restored one of these and I remember them being 6AX5 or 6AV5 or some number like that, not 6AX4.
If you restore the Emerson, be sure and change all paper caps. I left an original paper capacitor in the AGC circuit that had all of 4 volts across it. Sure enough, the AGC gave trouble until I replaced it.
Another note about my restoration of the Emerson is that the CRT was dead as a doornail. I could not get any brightness, no matter how many times I tried to rejuvinate it. I had to wait until I found a parts set with the same CRT before completing the restoration.
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