17" RCA with doors

[sansui2000A]

I bought a old B&W set today. It has wood doors that hide the picture tube and knobs kinda cool. I'll post a pic when I get it home.

I just wondered how old it might be and what sams would apply to it.

I found these numbers on the chassis:

274-113 5

RVC-L9

The picture tube is a 17CP4 was that a common tube?

Any help would be appreciated.

Thanks