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Riders lists both 6CB6 and 6AG5 for 2nd and 3rd video IF's. There's also a note that "late models contain additional 6AU6 AGC tube similar to model VL-19". I'm assuming with the addition of AGC they decided they didn't need as much gain, or possibly the later simply works better with AGC.
Last edited by Kevin Kuehn; 03-07-2020 at 07:53 PM.
Reason: Corrected 6AG6 to 6AG5
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