The Audio Playground Synthesizer Museum

HAMMOND

TONE CABINETS

- Hammond Tone Cabinet Models -

Model A-20

Production Years:
Oct. 1935 to Oct. 1939.
Cabinet Size:
27" wide, 30" high, 15" deep.
Power:
20 Watts.
Speakers:
2-12" electrodynamic speaker.
Amp/Crossover:
Parallel push-pull 2A3s, 2-56 triodes, 1-5Z3 rectifier.
Comments:
Attractive cabinet with doors, makes a great bar.

Model A-40

Production Years:
Oct. 1935 to 0ct 1947.
Cabinet Size:
Utility cabinet 26.5" wide, 28" high, 19" deep.
Power:
40 Watts.
Speakers:
4-12" electrodynamic speakers.
Amp/Crossover:
Uses two of same amp in the A-20.

Model B-40

Production Years:
Nov. 1936 to Dec. 1947.
Power:
40 Watts.
Comments:
Same as the A-40 in a seme decorative cabinet.

Model C-20

Production Years:
Oct. 1937 to Mar. 1942.
Power:
20 Watts.
Amp/Crossover:
Very early units used same amp as A-20. Later units had 4 6V6, 1 6SN7 and
1 5U4.
Comments:
All C-20 cases were quite deluxe.

Model C-40

Synopsis:
Spinette style cabinet. Same specs. as A-40.
Cabinet Size:
38 wide, 71 high, 27.5 deep.

Model CX-20

Production Years:
Jan. 1939 to Mar. 1942
Synopsis:
Same as C-20 with tremolo rotor, similar to Leslie bass rotor. speakers were
mounted on a "Vee" shaped baffle with the rotor in the center.

Model CXR-20

Synopsis:
Same specs as CR-20 with addition of the oil reverb unit.
Amp/Crossover:
An additional preamp chassis with 2 6J5's and 2 6J7's interfaced the reverb. On
later units the tubes were 1 6SN7 and 2 6SJ7's.

Model D-20

Synopsis:
Same as C-20 in a more utilitarian cabinet.

Model DR-20

Synopsis:
Same as D-20 with addition of oil reverb. See CXR-20 for description of amplifiers(s).
On later versions, reverb preamp was incorporated into the main amp. chassis.

Model DXR-20

Synopsis:
Same as CXR-20 in a plainer case.

Model DU-1

Synopsis:
A demonstration tone cabinet used by Hammond salesmen to show off the reverb unit -

Model ER-20

Production Years:
Mar. 1947 to Dec. 1950.
Synopsis:
Same speakers, amps and reverb as late DR-20.
Cabinet Size:
31 wide, 38.75 high, 18 deep.

Model F-40

Production Years:
Jan. 1948 to Dec. 1957.
Synopsis:
Essentially a B-40 with revised woodwork dimentions to accomodate a reverb
unit. When so equipped, becomes FR-40.
Cabinet Size:
32 5/16 wide, 39 3/16 high, 28 3/8 deep.

Model H-40 and HR-40

Production Years:
Oct. 1948 to Feb. 1960.
Cabinet Size:
33-1/8 wide, 48 high, 16-7/8 deep.
Power:
40 Watts.
Speakers:
9-10" speakers for Bass and 2-12" for treble.
Reverb:
R model has oil reverb which affects only the treble channel.
Amp/Crossover:
Two amplifiers similar to D-20 or DR-20 in early units. Later units had both
channels on one chassis and used 2 5U4's, 2 6SN7's, 2 6SJ7's, 1 6SC7 and 8
6V6's. Active crossover at 200 Hz 12dB per octave.

Model JR-20

Production Years:
March 1951 to Feb. 1959.
Cabinet Size:
29-3/4 wide, 39-3/4 high, 15-7/8 deep.
Power:
20 Watts.
Speakers:
4-10" Bass speakers and 1-12" treble speaker.
Reverb:
Oil reverb in three degrees on both channels.
Amp/Crossover:
Active crossover - 200HZ, 12db per oct. Amp uses 1 5U4, 4 6V6's, 2 6SJ7,s,
2 6SN7's and 1 6SC7.
Comments:
Most B and C 2 and 3's were sold with this cabinet.

Model K-40 and KR-40

Synopsis:
Same as H and HR-40 in utility cabinet.

Model P-40 and Q-40

Synopsis:
Same as PR-40 and Q-40 sans reverb.

Model PR-20 and QR-20
Production Years:
Feb. 1959 to Jul. 1963.
Cabinet Size:
31-1/2 wide, 37-1/2 high, 18 deep.
Power:
20 Watts.
Speakers:
2-15" bass speakers and 2-12" treble speakers.
Reverb:
These cabinets use the three necklace dry reverberation unit.
Amp/Crossover:
Amp used 1-5U4, 1-12BH7, 2-12AX7's, 1-12AU7, 2-6AU6's, 6-6BQ5's
and one 2N169 transistor for reverb recovery. Three channels 0-200hz
bass, 200+hz treble and treble reverb.

Model PR-40 and QR-40

Synopsis:
Same as PR and QR-20 except 2 5U4's, heavier transformers and speakers.
Power:
50 Watts.

Model Series 10

Synopsis:
Solid-state for H-100, E-100, etc.
Power:
145 Watts.
Speakers:
1-15" and 2-8" speakers.

Model Series 12

Synopsis:
Solid-state for the X-66 only