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Make sure the 1B3 is good. If the set uses porcelain insulators on the 1B3 socket, they go bad and cause blooming.
High voltage rectifier should always be replaced when changing flyback.
For horiz alignment, short the coil section with the cap and adjust for proper frequency. Then remove short and adjust the other end of the can for proper freq, then touch up a half turn to prevent "motor-boating".
Make sure the 180uuf horiz osc coupling cap is good. Replace with silver mica only.
Check HO tube screen resistor for proper value.
For sound buzz, check 4uf cap in sound detector and make sure the aquadag CRT coating is well grounded.
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