Shure 1949 catalogue phonograph

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REPLACEMENT CARTRIDGES

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The new highly compliant Shure Vertical Drive" crystal pickup
cartridges are an exclusive development of Shure engineers.
They have been perfected to meet the .greater requirements
of high needle point compliance and fidelity demanded by the
new micro-groove recordings. They are also recommended
for standard groove records where extra quality is desired.

Vertical Drive Construction: The introduction of
micro-groove recordings called for new requirements in phono-
graph pickup cartridges. The obiective of Shure engineers was
to minimize the mass of the moving system in the cartridge with
increased needle point compliance. They sought to do this and
still provide a practical cartridge with relatively high output

displacement of the needle point to the force applied (shown
in terms of centimeters per dyne).

As a result of the Vertical Drive" construction these new
Shure cartridges have a needle point compliance of the order
of 1.0 x 106 CM per dyne. This is over twice the compliance of
conventional pickup cartridges! Although needle point com-
pliance is the prime factor in determining the low needle force
required for proper tracking, other factors also play an im-
portant roll, such as arm resonances and effective mass of arm.
The Shure arms described on the opposite page have been
designed to take full advantage of the maximum benefits of
these fine cartridges. Shure vertical cartridges will track micro-
groove records with a needle force of only 5 grams. They will
also play standard 78 r.p.m. records with an amazingly low
needle force of only 6-7 grams. This eliminates the need for
the shifting of weight or needle force when playing both
micro-groove and standard records with one cartridge, as is
required with most other cartridges. Because of the Vertical
Drive" construction, the Shure Model W22AB turnover crystal
cartridge plays both standard and micro-groove recordings
with the same low pressure of 6 grams, simplifying arm
design and eliminating many of the problems connected with
the shifting of weight.

Another outstanding advantage of the Shure Vertical
Drive" cartridges is their small size and light weight. The car-
tridge including needle and guards weighs only 4% grams.

Special Features: The unique design of the "Vertical
Drive series provides the following special features:
1--Extended Frequency Response-to 10,000 c.p.s.
2-High Output-approximately 1 volt
3-High Needle Compliance-1.0 x 10'6 CM per dyne
4-Low Tracking Force-only 6 grams
5-Finger-Tip Needle Replacement

and with replaceable needles. To minimize the mass of the Model Applications
moving system and still permit the convenient use of replace- W21A For 33%-45 r.p.m. Fine-Groove Records. Extended
able needles required a basic new design. The answer was response. Standard V2 mounting. .001 Sapphire
uniquely achieved in the Shure Laboratory through the use of needle.
0 vertical drive system. In Vertical Drive the needle chuck W21AR Same as W21AI bl With bracket for RCA mounting.
rotates on a vertical axis rather than horizontally. Therefore To replace RCA 45 r.p.m. cartridge.
the principal mass of the needle chuck is on the axis of rota- W22A Turnover Cartridge. Two Sapphire needles-.001
tion, reducing its effective mass to a minimum. This permitted and .0027.
the use of a needle chuck that would accommodate finger-tip W22AB Turnover Cartridge .001 Sapphire needle and
needle replacement. .0027 Osmium needle.
W23A For standard records. Extended response. .0027
Advantages in Vertical Drive Construction: Sapphire needle.
Needle point compliance expresses the ratio of the lateral W238 Same as W23A but with .0027 Osmium needle.
MIN. SHURE
MODEL TYPE #ng OLlél/Zl NEEDLE REsfigNSE lelEGTHr NEEDLE NEEDLE CODE
FORCE NUMBER
.001
W21A MG $ 8.75 1.0 V.* 5 grams 10,000 c.p.s. 4V2 grams Sapphire A65MG RUVET
.001"
W21 AR MG 8.75 1.0 V.* 5 grams 10,000 c.p.s. 4V2 grams Sapphire A65MG RUVAR
MG 10 v.* .001 sapphire A65MG
W22A STD 1 1.75 1.1 V.** 6 grams 6,000 c.p.s. 5 grams .0027 Sapphire A61A RUVAL
MG 1.0 V.* .001 Sapphire A65MG
W22AB STD 10.75 1.1 V.** 6 grams 6,000 c.p.s. 5 grams .0027 Osmium A62A RUVAX
.0027
W23A STD 8.75 1.1 V.** 6 grams 7,000 c.p.s. 4V2 grams Sapphire A61A RUVAY
.0027
W238 STD 7.75 1.1 V.** 6 grams 7,000 c.p.s. 4V2 grams Osmium A62A RUVER

Shipping wt. is 1 oz.

iOutput on Columbia 331/3. r.p.m. records and RCA 45 r.p.m. records. **Output with .0027 needle on 78 r.p.m. records.

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