Pioneer sx-40
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The
Pioneer SX-40 model was the successor to the SM-Q300 series. A
stereo MPX decoder module with three tubes 6AQ8 / ECC85, 6CG7 and
6AV6 / EBC91 was added to it. Of course, the second tuner for the
AM range was also removed. The "magic eye" EM84 lamp was used as a
tuning indicator, which is very rare for Pioneer. The power
amplifier was a Push & Pull design with automatic bias. Unlike
the SM-Q300, a 12AX7 / ECC83 was used as the driver tube. It was
enough for this function, as the output tubes were the usual 6BQ5
/ EL84. The other elements of the low frequency path did not
change much and also used 12AX7 / ECC83 tubes. Thanks to this, the
number of types in the amplifier has been limited to two - 6BQ5 /
EL84 and 12AX7 / ECC83. The SX-40 was not able to work with a
microphone. Adjusting the bass and treble was performed independently for each channel on double coaxial potentiometers. The balance and volume controls were also based on a coaxial potentiometer, the outer part of the knob regulated the balance, and the internal volume. Visually, the receiver used the design line that housed the SX-82 receiver, SM-83 series amplifiers and AFT-14 and TX-5 tuners. |
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L.A.2008
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