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Watch for dry electrolytics in the horizontal oscillator area. Also check and scope the the B+ to be sure it's is clean and free of AC and noise, and regulating at 130v (or 135 on some Sonys). If that's low or high, fix that problem first, or there will be more blown transistors. I can't remember any tips on that chassis, but 95% of the time, all trouble starts with dry electrolytics in the power supply and horizontal on 1960s-70s Sonys ;-) .
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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