|Spectro Acoustics 217 Amplifier|
|Category:||Audio Video TV Multimedia|
The Model 217 Straightline Preamplifier has begun a new era in the accurate reproduction of musical material recorded on phonograph discs. Aside from including the most useful features found on expensive "control console" type preamplifiers (often left out of other "straightline" designs) the 217s totally new and unique phono TV Multimedia">Amplifier stage provides seven front-panel pushbuttons designed to individually tailor the input parameters and gain/frequency response characteristics of the all-important phono preamplifier stage to any of the scores of available magnetic phonograph pickup cartridges. Four of the seven phono-stage pushbuttons can be used to provide 16 different permutations of input impedance, in both the resistive and capacitive "cartridge loading". More on this important new feature later, (see PHONO STAGE CONTROLS section) Also included among the seven phono-stage controls’ is a gain selector button, used to optimize noise and phono overload considerations for both low-output cartridges and higher output cartridges. Although the RIAA standard phono equalization curve remains highly accurate at any control setting, this button can be used to change the overall gain or amplification factor of the phono stage from the standard 40 dB to a less sensitive 30 dB setting, both referring to mid-band gain at a reference frequency of 1000 Hz. A sixth phono stage pushbutton activates the SSF or subsonic filter to eliminate sub-audio TV Multimedia">Turntable rumble and the low-frequency mechanical/acoustical feedback problems often found in high power installations. The third order Butterworth response of this active high-pass filter allows even the lowest audio frequency information to pass unaltered while its steep downward slope of 18 dB per octave below 20 Hz virtually "wipes-out" dangerous and irritating sub-audio noise. With all this attention paid to ultra-accurate reproduction of recorded phonograph signals, the final phono-stage pushbutton is included to allow accurate A/B comparisons of two phono sources and to allow simple program selection of either phono 1 or phono 2 inputs. The high level section of this superb piece of audio instrumentation contains a second gang of eight pushbutton controls for source selection, complete dual-machine tape recording, playback and machine-to-machine copying in either direction. Material may be recorded on both tape machines at the same time if desired, as well, and, during tape-to-tape copying, other program sources may be monitored without interfering with the copying process in any way. Dual tape monitor circuitry and switching allows off-the-tape monitoring of either machine as well as simple playback monitoring for playing back pre-recorded taped material. It is by way of these dual taping circuits that an outboard unit (such as the Spectro Acoustics Model 210 Graphic Equalizer) can be inserted into the audio path either before, between or after the tape recorders to allow pre-equalized recordings to be made on either or both decks and between-copy equalization from one deck to the other as well as straight playback equalization of material from one of the tape machines. In addition, the outboard unit (in the case of the Model 210 TV Multimedia">Equalizer anyway) can be inserted in the output Tines for playback equalization of sources other than the tape recorders, including phono, TV Multimedia">Tuner and any auxilliary line-level source of program material. Besides these dual tape monitor and tape copy pushbuttons (four in all) the 217 includes pushbutton source selection of either tuner, phono or auxilliary inputs and, of course, the standard mono/stereo switch, which only affects the playback signal in this case. Material at the tape outputs remains in stereo in either position of the mono/stereo switch.
These manuals are available for the above equipment:
|Spectro Acoustics -- 217 -- Service and User Manual|
|Manual Type:||Service and User Manual|
|Size:||870.77 Kbytes (891672 Bytes)|
|Quality:||Scanned document, reading partly badly, partly not readable.|
|Upload date:||05 October 2019|
|Downloads:||86 since 05 October 2019|
WARRANTY STATEMENT ... Page 2 PURCHASE RECORD ... Page 3 AFTER UNPACKING ... Page 4 INTRODUCTION ... Page 5 FRONT PANEL CONTROLS ... Page 6 REAR PANEL CONNECTIONS ... Page 7 INSTALLATION ... Page 8 PHONO STAGE CONTROLS ... Page 9 SETTING UP FOR YOUR CARTRIDGE ... Page 12 30dB/40dB SWITCH ... Page 14 SUBSONIC FILTER (SSF) ... Page 14 PHONO 1 / PHONO 2 SWITCH ... Page 14 FUNCTION SWITCH ... Page 15 FUNCTION IMPLEMENTATION DIAGRAMS ... Pages 16 & 17 GRAPHIC TV Multimedia">Equalizer (Spectro Acoustics Model 210) ADD-ON ... Page 18 MAINTENANCE AND REPAIR ... Page 20 SPECIFICATIONS ... Page 21 SCHEMATIC DIAGRAM ... Page 23
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