Answers to Leslie Trivia Quiz

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The attached ASCII text file has the answers to the Leslie Trivia Quiz. (It's
a bit long to run here.)  If you took it, hopefully you had some fun with it!
 

Harvey Olsen
HOlsen5629@aol.com

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LESLIE TRIVIA QUIZ ANSWERS:
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Leslie Speaker Models:
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1 - 30C      6 - 114      11 - 257      16 - 520
2 - 47R      7 - 116      12 - 258      17 - DVX-580
3 - 55C      8 - 120C     13 - 301      18 - 751
4 - 100GK    9 - 202S     14 - 350      19 - 881
5 - 105     10 - 215A     15 - 412J     20 - 900U
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MODEL 30C - In 1941, Don Leslie designed a "church" version of the
first (1940) Model 30A.  The 30C was identical to the 30A except that
the rotors ran at half-speed and delivered sound from two (instead of
one) rotor openings.  The effect was a slower, lighter tremolo that
somewhat resembled a church pipe organ tremulant.  The combination of
a Hammond Organ-Leslie Speaker was still years away from becoming the
gospel organ standard and the milder 30C tremolo was more acceptable
for "traditional" churches.  Less popular than Model 30A, relatively
few Model 30C Leslies were produced during 1941-1942. (World War Two
interrupted production in mid-1943.)  Model 30C was discontinued when
production resumed in 1946 after the war.
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MODEL 47R - Don't look for Model 47R in early Leslie data sheets but
this rare "reverb version" of Model 47 was available if requested.
Before Electro Music became part of CBS Musical Instruments in 1965,
custom Leslies could be ordered provided they could be assembled from
stock parts. (The 47R was a 22R cabinet with a 47 power amp.)  Like
Hammond-type Model 22R, it needed the components from a Hammond (ETK)
spinet reverb kit to complete the installation.  Since the 47 was not
a "Hammond" Leslie, Model 47R was special-order only.
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MODEL 55C - This Leslie was an early make/model-specific two channel
model for Conn Organs. (The power amp is similar to Model 51C.)  The
55C and 100GK are also the first Leslies with Rotosonic drums and
Mercotacs (rotary mercury contacts).  The drum has three 6X9 speakers
that are driven by the secondary channel.  The main (non-tremolo)
channel has a 15" bass speaker and a stationary 6X9 speaker.  With no
rotary horn or bass rotor, Model 55C worked only with selected Conn
models and was not used with other organs.
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MODEL 100GK - The 100GK is the original Leslie "Isomonic" system, a
specialized model for the Gulbransen Model "K" Theatre Organ.  Model
100GK also was Leslie's first venture into multichannel speakers with
a four channel vacuum tube power amp.  It was replaced by Model 101
and the later 102/103 dual-cabinet system.
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MODEL 105 - This prototype model was going to be called the "Round
Sound Machine."  A few were built but sold only to employees and no
commercial version was ever released.  (I warned you that some of
these Leslie models were obscure!)  It had a single foam rotor like
the built-in OEM Leslie modules sold to organ manufacturers and no
amplifier.  It was hardly Leslie's finest effort and it's probably
just as well that it was discontinued before it could be produced.
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MODELS 114 and 116 - Both are identical to the tiny "spinet" Model
110 except that the front grill cloth in the 114 matches the Hammond
"Piper" and the grill cloth in the 116 matches Kimball spinet organ
models 170 and 180.
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MODEL 120C - The 120C is similar to Model 120 except that the single
foam rotor has dual openings and runs somewhat slower.  Model 120C
was usually used in combination with a standard Model 120 and carried
string, reed, and other complex wave voices only. (The concept is the
same as the prewar Model 30C.)
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MODEL 202S - The 202S (and Model 202) was a four-channel, tube-type
Leslie with dual Rotosonic drums (upper/lower).  The "S" in the model
number indicates it also came with the Leslie "Space Generator."  It
was electrically and functionally similar to Models 205 and 610 but
intended for Wurlitzer Organs only.  Model 202S was replaced by the
solid-state Model 212S.
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MODEL 215A - This model was a small "add-on" cabinet with a single
Rotosonic drum.  It was designed to be used with the organ's console
speaker system or a second full-range external Leslie cabinet.  The
"A" in the model number indicates that it is an upgrade of Model 215
that came with a "Leslie Control Center," a fancy name for a simple
switch box.
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MODELS 257 and 258 - Extremely rare, these Leslies were a "system"
for an early high-end Thomas Organ.  Both were contained in "low boy"
cabinets like Models 222, 247, and 351, but had custom front panels
that matched the Thomas Organ.  Model 257 is a "rotary" cabinet with
a single power amp similar to Model 247.  Model 258 has stationary
speakers (only) for complex wave voices and the pedals and has two
separate power amps. (Unlike other tube-type "low-boy" Leslies, the
257 and 258 have nine-pin inputs.)
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MODELS 301 and 350 - Both are early specialized multichannel Leslies
with four channel tube amplifiers.  The Model 301 and earlier Model
300 were designed for selected Thomas Organ models.  The Model 350
was electrically similar but configured for multichannel Conn Organs.
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MODEL 412J - The 412J is the "Japanese version" of Model 412 (made in
the US).  Both were intended for Hammond's "Super B" Organ but usable
with most three channel organs.  They are functionally identical but
their internal components are not interchangeable.
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MODEL 520 - This model was an unusual solid-state two channel Leslie
without rotors "intended for organs with phase-shift tremulants."  It
was contained in the same cabinet as rotary-type Model 720 and Models
520 and 720 also were used as a dual-cabinet system for conventional
four channel organs.
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MODEL DVX-580 - The DVX-580 is one of several "audiophile" Leslies
developed by CBS in the mid-seventies for quad stereo music systems.
Other models in this controversial series were: 430, 450, 470, and
DVX-570. ("DVX" stood for "Dipolar Variable Axis.")  These are the
only Leslie models that were not intended for use with electronic
musical instruments.  Promoting Leslie Speakers to audio "purists"
for music reproduction was a tough sell and CBS quietly discontinued
the series a couple of years later.
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MODEL 751 - This four channel "semi-prototype" Leslie was created for
the 1985 "Laurens Hammond" Model 350 Organ.  It was displayed at the
'84 NAMM Show but Hammond went bankrupt in '85 and this early digital
Hammond-Leslie Speaker combination was never released.  Model 751 was
electrically identical to a standard Model 750 but had minor cosmetic
differences and piezo tweeters in the non-rotary channels.
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MODEL 881 - The 881 was to have been an "eleven pin version of Model
760."  A single prototype was built but later destroyed. (Sorry about
the "ringer" but I had to include it!  If you knew this one, you pro-
bably worked in Leslie engineering.)  Models closest to the 881 are
the 860, a tiny, powerful, single channel biamped portable model, and
the current 771.  Model 771 is an eleven pin update of the old nine
pin Model 770.  (However, Model 770 and 771 Leslies are contained in
conventional finished wood cabinets.)
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MODEL 900U - The 900U was a "utility" version of Model 900 contained
in a black plywood cabinet without vinyl covering or casters.  It was
intended for multi-cabinet and/or concealed installations.  The 900U
was less popular than its portable equivalent, Model 900 (and later
910), and only a few were made.  There also was a utility version of
Model 825, the 825U.
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                          * * * * * * * * *
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Hopefully, our Leslie Trivia Quiz was fun and informative.  Don't feel
bad if you didn't get everything correct; researching this material
has taken much time and effort.  (You can always print the quiz and
spring it on unsuspecting "Leslie experts" who think the 122 and 147
series were the only things Don Leslie ever did.)
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For the record, there are 120 known Leslie models and variations and
it's possible there are "one-offs," "export" models, or prototypes
that have been overlooked.
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Harvey Olsen
3032 West 47th Street
Chicago, IL 60632
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HOlsen5629@aol.com
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