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If you have another known good set with a transformer power supply (or a hot chassis set with an isolation transformer) this can work good as a tuner check out device. It doesn't matter if it's color or black and white. If you suspect tuner problems in the suspect set, sub in the test set's tuner using the 45 mhz IF output and if you suspect IF problems in the suspect set, hook its tuner IF output to the test set's IF input.
I used a Zenith B/W set with a solid state tuner this way to help find problems in an RCA CTC-28. The picture was very weak and snowy but the RCA set's tuner produced a good picture on the Zenith set. It turned out to have one bad IF tube and and bad 1st video tube.
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