Heathkit A 9A Schematic
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Page 1
HEATHKIT AUDIO AMPLIFIER
MODEL A-9A
SPECIFIC ATIONS
Frequency Response ..... . . ....... . . . ....... . . . . . .
PowerOutput.......... ......
Total Harmonic Distortion. . . . . . . . . . . . .
Input Requirements (for 15 watts output)
Magnetic Phono Input... . ..... . . . . .. . . ..... . . .
Microphone Input........... ...... .. .......
CrystalPhonoInput.......... ...........
TunerInput................. .........
Tone Controls
Bass(at30cps)........... ...... '. ........
Treble (at 15 kc) ..... . ................
Power Requirements ....................... . . . . . .
TubeComplement......... ..................
Dimensions ...... . ....... ' ..... . ...... . ...........
Shipping Weight ............ . ..... . ............. . .
:tl db 20 to 20,000 cps
20 watts
1% (at 3 db below rated output)
0.007 volts
0.01 volts
0.08 volts
0.6 volts
15 db boost, 15 db cut
15 db boost, 20 db cut
100 watts, 105-125 volts 50/60 cycle AC
12AX7 magnetic phono preamplifier and
input amplifier
12AU7 voltage amplifier and tone
control amplifier
12AU7 voltage amplifier and phase
splitter
Two 6L6G push-pull pentode power
amplifiers
5U4G Rectifier
13 1/4 x 8 1/2 x 6 5/8 high
17 lbs.