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2.7 Are the stylus cartridges used in stereophonic players differentfrom those used in monaural players?




Description

This article is from the RCA SelectaVision VideoDisc FAQ, by tom@cedmagic.com (Tom Howe) with numerous contributions by others.

2.7 Are the stylus cartridges used in stereophonic players differentfrom those used in monaural players?

RCA introduced a new stylus cartridge about the same time the stereo
players hit the market. This new cartridge was intended for use with a
redesigned stylus sensor mechanism. All F and G players with the older
pickup arm assembly No. 149002 should use the No. 149000 stylus cartridge,
while players with the newer pickup arm assembly No. 154036 should use
the No. 154100 stylus cartridge. Here's a stylus cartridge replacement
summary for all RCA players:

Stock No. 149000 used in all SFT100
Stock No. 149000 used in early SGT075 and SGT100
Stock No. 154100 used in SGT075/SGT100 starting at Serial No. 2155xxxxx
Stock No. 154100 used in all SGT200 and SGT250
Stock No. 154216 used in all J and K series players.

It is still always possible to use the 149000 cartridge in place of the
154100 cartridge, but using the 154100 in a player designed for the
149000 may possibly cause problems. With the new pickup arm assembly,
RCA widened the stylus sensor spacing to accommodate a rubber damper
that can be seen on the 154100 cartridge just above and behind the
stylus tip. This rubber damper lessens the likelihood of audio resonance
which can sometimes be heard as a hissing sound around 10 KHz. A 149000
cartridge can be used with this new arm assembly with no ill effects
other than the resonance damping function not working. But using a 154100
cartridge in a player with the narrower stylus sensor spacing may cause
the visual search mechanism to fail in either the forward or reverse
direction. This would occur on 154100 cartridges that have the rubber
damper uncentered, leaving too little space for the magnetic coil to kick
the stylus the required two grooves forward or two grooves back. The
149000 is also the preferred replacement in the monaural Elmo, Sanyo,
early Sears, Toshiba, Wards, and Zenith players that are either internally
identical to the SFT100, or were designed before RCA implemented their
wider stylus sensor spacing. Hitachi and Toshiba also manufactured their
later stylus cartridges with a rubber damper, but these dampers were
narrower than RCA's, and didn't require a widened stylus sensor mechanism.


 

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previous page: 2.6 Is it true that new stylus cartridges for CED players have beenunavailable for a long time?
  
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