[Jukebox-list] Victor Records and tone choke

[Jay Hennigan]

Di Di Mao wrote:
> Hello!  Thank you for adding me to the list.
>   In the future, I hope to add my share to the group.  For now, though, I have a question.
>   In the service manual for 1939 Seeburg models, I read "which becomes operative when the older Victor records are used..."  (This is in relation to an end of record clutch trip mechanism.)
>   Just what was a "Victor record", and how would it differ from your average 78 record with respect to end of record detection?

Victor records are those manufactured and sold sold under the Victor 
label (makers of the Victrola, later RCA Victor), as opposed to 
Columbia, etc.

Very early disk records didn't have a lead-in or lead-out groove and 
weren't suited for jukebox use.

Later records were made with a lead-out grove that goes to a circular 
end groove near the label.  The jukebox would trip to reject the record 
when the stylus reached a point at a certain distance from the spindle.

Victor had a patented "Victor trip" that was used to kick in the brake 
on a Victrola, also used to detect end-of-record in jukeboxes.  The 
lead-out led to a circular groove at the end of the record that was 
offset from the spindle.  When the stylus landed in this groove, the 
tonearm would wag back and forth, moving in and out.  This action would 
drive a ratchet as the arm moved outward and trip the mechanism, not by 
the absolute position of the stylus, but by the movement outward at the 
end of the record.

In order to accommodate both Victor and non-Victor records, the trip 
mechanism needed to be capable of detecting either the absolute position 
or the off-center backwards movement.  In reality, the absolute position 
was really adequate to detect Victor records as well as others as the 
end-groove reached a point close enough to be the center to trip the 
mechanism.  But if a jukebox was manufactured with only a ratchet trip 
it would fail to trip on records without the off-center end groove and 
would need to be modified to detect absolute position in order to work 
with non-Victor-trip records.

--
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
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