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Original well scanned manual. Got the job done. Microwave problem found & corrected. For $5 and a new magnitron from ebay, it was a cheap and good the first shot fix. Electrical schematics allowed me to mage sure every thing else was ok before cutting and order for parts. Hard to live without.
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I was very skeptical of this website, I have never downloaded manuals before. I put it on the AMEX and payed through Paypal to ensure protection. I got the manual exactly as described and now I can replace the filter capacitor for this amp. Great Price, others selling for 12.99 or more and this is the same manual. I will search out this website for other manuals. Thank you
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Manual was reasonably easy to follow. I am not an engineer or know much about electronics but with the manuals help I was able to figure out the problem, identify the part required for the repair. Replacement part cost around $30. Whilst replacing the part I was telling myself, "this aint gonna work cos it seems far too easy". Took about 15 minutes to do and my plasma TV works a treat. Would never have been able to do this without the service manual.
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It is OK, this manual help me to repair my dynacord
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Good manual. Even it is an old printed manual, it is well scanned and complete, with all drawings, schematics and parts list. Very good return for the cost.
Technical Manual
Beta 20
ACOUSTIC & ELECTRICAL SPECIFICATIONS: � Nominal Impedance 8Ω � Max Amp Power 150 watts* � Frequency Response 58Hz � 20kHz (±3dB) 52Hz � 40kHz (�6dB) � Sensitivity 90dB (2.83V @ 1 meter) � Crossover Frequency 2.4kHz; 12dB/Octave SYSTEM COMPONENTS: � Cabinet � Grille Black (for BLK) Gray (for BE & CH) � Low-Frequency Transducer AURAL SWEEP TEST SPECIFICATIONS: � System Aural Sweep Test 6.0V Input 50Hz to 20kHz � L.F. Aural Sweep Test 5.0V Input 50Hz to 3kHz � H.F. Aural Sweep Test 2.83V Input 2kHz to 20kHz PHYSICAL SPECIFICATIONS: � Dimensions 13-3/4" x 8-7/8" x 13" (H x W x D) (350mm x 225mm x 330mm) � Weight 20.7 lb (9.4kg) Each 40 lb (18.8kg) Sold in Pairs WARRANTY: � Refer to Warranty Statement packed with each product. * The maximum recommended amplifier power rating will ensure proper system headroom to allow for occasional peaks. We do not recommend sustained operation at these maximum power levels.
DC Resistance � High-Frequency Transducer
DC Resistance � Crossover Network
Beta 20 (Not for Sale) 352006-003 352006-004 6-1/2" (165mm) CMMD, � magnetically shielded 351505-001 4.6 ohms ±10% 1" (25mm) CMMD, � magnetically shielded 351572-001 3.5 ohms ±10% 351570-001
PACKAGING
22 23 24 19
Beta 20 WIRING DIAGRAM
HIGH-FREQUENCY TRANSDUCER 351572-001
YEL/BLK �
LOW-FREQUENCY TRANSDUCER 351505-001
5
� BLK
YEL
+
GRN
+
+ �
22 23 24
GRN/BLK RED
18 20
CROSSOVER NETWORK 351570-001
Beta 20 SCHEMATIC
+
INPUT
L1 2.0mH C1 12uf 100V 15" GRN
.250
5 21
�
L.F.
.205
15" GRN/BLK
17 Legend on Page 2
R1 2.5Ω 10W
15" YEL C2 2.2uf 50V L2 0.6mH
.205
H.F.
15" YEL/BLK
.110
Infinity Systems, 250 Crossways Park Drive, Woodbury, New York 11797
6/04
Beta 20
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