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The 300 volts on pin 2 (6SL7) is derived from a bleeder chain starting at the DC high voltage. Look for a bad 1B3 or shorted 6KV cap on the DC side. That would explain the missing 300 v and no raster. Easiest way to test is to clip the low voltage end and check for high DC voltage on the open end. The raster will reappear when you find the bad one. Start with C-59
If no progress, check the bleeder chain starting at the low end and work backwards to the 1B3 filament. You need meter that safely measures up to 6KV as you work up to the 1B3. Without that, if you don't get any voltages at the low end, you can assume the chain is OK and there is no high voltage. The resistors may be off value, but none so far as to kill the high voltage without some arcing or smoke.
Don
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