Not the technicians abilities, but the horrid quality of Zenith sets
made during the end of Zenith as a real company during the bankruptcy
sell out to LG electronics.

Need some basic troubleshooting information to give any further hints.

BTW $150 for a 9 year old non-working Zentih RPTV is $150 too much.

9-1974 large signal module is probably bad, do a web search for the
price. Even if you find a good technician who can repair this to
component level and still get the parts, the cost to repair typically
runs around $400 for the major repairs on the set that are required.