zenith tuner module 175-5073-01 compatability
 

Hey All, i bought a NOS zenith tuner module 175-5073-01 off of fleabay, i'm hoping it will sub to a zenith chassis 23lc45z1 set that i own, which uses a 175-5074 which is in it, can anyone confirm or deny it as a replacement? i can do modifications if necessary. thanks Mike

Might be more of a mechanical difference rather than electrical. What's wrong with the old tuner? Can you post pics?

Only way to tell is look it up in the parts catologue. If
its physically the same it may work BUT your set uses
24V low B+ and the same year S-3 uses 12V. Other
difference is S-3 RAT tuners covered some CATV freqs.
If its one of the big dual tuners with 2 plugs on the side
resolder under the plugs & look for cold joints around the
shielding.
BTW drop a note to drh4683 he may have a parts catologue.

73 Zeno:smoke:
LFOD !

the old tuner, drops out after a while. picture is fine for a hour or so then detunes. i wanted another tuner as a backup before i take the old one apart and try to clean it. if i change channels up and down then back to ch 3 the picture comes thru nicely. several posters said that the tuner is a problem point in this set.
The tuner looks almost identical to the original unit. Chassis is 23lc45z1 if anyone has a memory for this set.
Mike

well that is why i am posting this. doug hasn't responded to my facebook message nor videokarma message. I don't have a zenith parts catalog yet. that is why i am posting to the videokarma masters who know all and teach us neophytes. Thenk you for your wisdom, Mike

Ive been looking for a parts cat for years. Trouble is
they pretty much switched to fiche in the 80's

I think we have some name confusion here. What you have is a selector.
The tuner is separate & mounted on the chassis.
Most selectors were built on ceramic & had printed parts & even
switch contacts. They usually didnt clean well so they got changed.
Price was only about $25 exchange. One easy thing to try if you havent
is tuning the adjacent channel. they overlap so you may get lucky.
The tuner tip still holds. Those PC cons were notorious for drift & other
intermittents.
Differences in numbers can be as simple as lead length or cosmetics.
A selector is nothing more than a 16 position voltage divider that
divides down 32 V for a tuning voltage. Add a switch for channel,
& band switching & an AFC switch. No active parts IIRC.

73 Zeno:smoke:
LFOD !

Ok, yes we are now on the same page. The "selector" is what i got on ebay. I tried going to channel 4 but here in the nashville market channel 4 was a real popular station along with channel 2 and 5. i imagine that the selector in it had been rotated from 2 to 5 about a half of million times during it's lifetime. lol if it isn't worn out now, it will be soon. the tuner problem is the reason they retired this set "tv man cleaned it once but it didn't last long" and bought a new tv. If the new selector doesn't fix it i guess the problem will be in the true "tuner" module