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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
Reference 1252w 12" Woofer � Technical Data
CAR AU DI O
SPECIFICATIONS
DIAMETER: SENSITIVITY (2.83 V @ 1 M): POWER HANDLING: FREQUENCY RESPONSE: NOMINAL IMPEDANCE: VOICE-COIL DIAMETER: DIMENSIONS:
mounting depth 5-1/16" (129 mm)
12" (300MM) 93 dB 300 WRMS 1200 W PEAK 23 ~ 400 HZ 2 or 8OHMS 2.0" (51.0 MM)
SEALED BOX VOLUME (INCLUDES DRIVER DISPLACEMENT)
Reference 1252w
(side view)
VBOX = 1.25 ft3 (35.40 liters)
cutout diameter 11-3/16" (284mm) outer diameter 12-7/16" (316mm)
SEALED ENCLOSURE FREQUENCY RESPONSE @ 2.83 V
105 dBSPL 100 95 90 85 80 75 70 65 60 55 20 Hz 30 40 50 60 70 80 90 100 200 300
THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE: R EVC (OHMS) . . . . . . 1.85 VOICE COIL INDUCTANCE @ 1 KHZ: L EVC (MH) . . . . . . . 1.12 DRIVER RADIATING AREA: S D (IN 2) . . . . . . . . 82.46 S D (M2) . . . . . . . 532.00 MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 9.76 COMPLIANCE VOLUME: SUSPENSION COMPLIANCE: MOVING MASS, AIR LOAD: MOVING MASS, DIAPHRAGM: FREE-AIR RESONANCE: MECHANICAL Q: ELECTRICAL Q: TOTAL Q: MAGNETIC-GAP HEIGHT: VOICE-COIL HEIGHT: MAXIMUM EXCURSION: V (FT3) . . . . . . . . 3.48 VAS (LITERS) . . . . . 98.64 C MS (µM/N) . . . . 244.00 MMS (GRAMS). . . . 176.80 MMD (GRAMS) . . . 169.75 FS (HZ) . . . . . . . . 24.23 Q MS . . . . . . . . . . . 6.63 Q ES . . . . . . . . . . . 0.52 Q TS . . . . . . . . . . . . 0.48 HAG (IN) . . . . . . . . 3/8 H (MM) . . . . . . . . 9.00
AG AS
In-Car 12 dB LP @ 80 Hz
Out-Of-Car
SEALED ENCLOSURE CONE EXCURSION @ 300 W
30m M 20m 10m 5m 2m 1m 500u 200u 100u 50u 20u 10u 5u 20 Hz 30 40 50 60 70 80 90 100 200 300
HVC (IN) . . . . . . 1-11/16 HVC (MM) . . . . . . . . . . 43 X
MAX
(IN) . . . . . . . . 1/2
X MAX (MM) . . . . . . 12.50
Harman Consumer Group � 250 Crossways Park Drive � Woodbury, NY 11797 � VOICE: 516-674-4463 � www.infinitysystems.com
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