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I have put a fuse clip (exposed terminals) into the HO cathode circuit on these type sets. You can put in a 6.3 volt fuse lamp and adjust the effeciency coil for minimum lamp brightness for minimum cathode current, then replace the lamp with a 300 ma fuse for fuse protection.
The later RCA's such as CTC-39's did have a disconnectable jumper lug to easily measure cathode current.
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