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Sounds like your 11 was an everyday driver. I'm surprised the mixer/oscillator in the tuner wasn't shorted too.
I haven't seen any of the circuit breakers in a while. Their reliability was very poor anyway. I have had to mount a fuseholder and use a slo blo fuse in place a few times.
The thermistor could probably be ordered from McIntosh Labs, the audio manufacturer. The thermistor for their older (not reproduction) Mc275 works in place just fine and I think it is still available. It may not be the exact value but it warms up to nearly zero ohms.
Check to see if the color oscillator has enough negative on the control grid. If it is low change the crystal with a big older style. The new (little ones) short out.
And don't forget to check horizontal output tube cathode current. Nearly all the sets I work on show it too high which will cook the flyback.
Let us see some pictures when it is up and running!
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