Kamis, 04 Agustus 2011

Conrad Johnson PV-2 (SOLD)

Conrad Johnson PV-2
Tube Preamplifier
Tube : 1 x 12AX7 , 2 x 5751 dan 3 x 12AT7
Ada gantian pada capasitor power supply
Komponen lainnya masih original
Potensio ALPS model besar
Made in USA
Harga : SOLD
pin BB : 20E12328
Introduced June 1980, 2A in March 1981, 2AR in January 1982

The PV2 was a refinement of the PV1. The PV2 offered a similar circuit with the more linear 5751 substituted for the second triode in the phono stage and 12AT7s used as cathode followers for lower output impedance. The PV2 was constructed on a single main pc-board, eliminating the cumbersome wiring harnesses of the PV1, and assuring unit-to-unit consistency in production. The PV2 maintained or improved the parts quality standards established in the PV1. A muting circuit was added to mute the turn-on and turn-off surges associated with tube preamplifiers.
The PV2a revision entailed eliminating a coupling capacitor from both phono and line stages, resulting in significantly improved bass performance. Re-trimming the phono stage resulted in improved linearity and even closer RIAA tracking, further improved by use of 1% tolerance capacitors in the equalization circuit. The input tube for the line stage was changed from a 12AT7 to a 5751. Coupling capacitors were upgraded from mylar to polypropylene. The PV2ar further enhanced this model by a number of parametric changes aimed at improving high-frequency transient response.
Inputs/Outputs — Phono, Tuner, Auxiliary, monitor and recording facilities for two tape decks with dubbing from Tape 1 to Tape 2. Two power amplifier (Main) outputs.
Selector, Source/Monitor, Mode (Reverse, Stereo, Mono), Balance, Volume, & Power.
Auto-muting to suppress warm up transients.

V1: 12AX7
V2, V5: 5751
V3, V4, V6: 12AT7
Tube Replacement Set RT2

Gain: Phono Stage 34.5 dB (phono overload 500 mV at 1kHz)
Line Stage 24.5 dB
Distortion: less than .05% THD or IMD
Response: bandpass 2Hz to more than 100kHz
RIAA equalization: +/- .25 dB (20 to 20 kHz)
S/N Ratio: Phono Stage 70 dB below 10 mv input
Line Stage 84 dB below 2.5 volt output
Phase Response: Line Stage phase correct, Phono Stage phase correct
Mechanical: 14" X 3 13/16" x 10"

Potensio ALPS model besar

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