"VA-100 MK.1” PREAMPLIFIER
“VA-100 МК. 1” PREAMPLIFIER- EQUALIZER
FREQUENCY RESPONSE —
HUM £ NOISE LEVEL pss
INTERMODULATION DISTORTION —
HARMONIC DISTORTION —
VOLTAGE GAIN —
CONTOUR CONTROL —
BASS TONE CONTROL —
TREBLE TONE CONTROL —
HIGH PASS FILTER SWITCH —
LOW PASS FILTER SWITCH —
EQUALIZATION =
TUBE COMPLEMENT —
—
20 to 20,000 cps.
85 db. below 2 volts rated output
Less than .5% at 5 volts output
0.05% at 5 volts output
5
Designed to provide 20 db. lift at 20 eps.
Designed to provide 15 db. cut or lift at 50 cps.
Designed to provide 15 db. cut or lift at 10,000 cps.
2 Position (Rumble Frequencies): FLAT position—Flat response.
BASS CUT position —20 db. at 30 cps.
2 Position (Tweet & Sratch Frequencies): FLAT position—Flat re-
sponse. TREBLE CUT Position—14 db. at 5 Ke. and —25 db. at 10
©,
24 different equalization curves are available using the roll-off and
roll-over selector switches. Included are equalization curves for
Early 78, Columbia LP, RIAA, London LP, FFRR, Flat, etc.
(3) 12AX7 — (a) Preamp. & Equalizer.
(b) Cathode follower input to filter circuit (Lo-Pass
High-Pass), Voltage Amplifier.
(c) Tone control circuitry to Voltage Amplifier to
Loudness Control and Low Imped, Coupling stage
(1) 6X4 — Rectifier
DC FILAMENT SUPPLY ON PREAMPLIFIER TUBES
POWER CONSUMPTION —
SIZE € WEIGHT —
FOUR INPUT JACKS —
FRONT CONTROLS —
OUTPUT JACKS (2) ses
REAR CONTROLS —
All values shown are nominal.
20 Watts at 117 Volts 25/60 Cycle
4%” High x 13%” Wide x 7%” Deep, 9 lbs.
Magnetic Phono — for low level magnetic cartridge
*Radio — for connection of AM or AM-FM Tuner.
*TV — for connection of TV sound to utilize tone controls and other
features of the VA-100 in combination with a hi-fi amplifier and
speaker system.
*Tape — for connection of tape reproducing system.
*These jacks can also be used for connection of phono with a crystal
cartridge.
Input € Roll-over Selector
Roll-off Selector
Level € Contour Control
Bass Tone Control
Off-on AC Switch and Treble Tone Control
(a) Low impedance to work into minmum load of 250,000 ohms for
best results.
(b) Output to tape recorder.
(a) Hum Balance Control
(b), Magnetic, load adjusting control (Phono Input)
POR
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