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There are currently no product reviews.
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everything was fine - fast, readable, worth the price
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I'm happy to get a manual from this rare old amp. The pdf is from good qualty.
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very quick service and manual as described - would happily trade here again!
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Fast Download,all pages present,an excellent copy.THis enabled to find the origional part numbers and chase them up. The cartridge is proving difficult to find but at least I know the origional part number.Thanks to all.
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The manual was as described. Complete with parts list and technical information. Fast delivery.
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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