Conrad Johnson PV 8

Descrizione

The PV8 superceded the PV5.

It was the first all-tube zero-feedback design from conrad-johnson.

The basic audio circuit of the PV8 is modular, built from individual gain blocks consisting of a triode amplifier direct coupled to a cathode follower.

The phono stage consists of a gain block, a passive RIAA network, and a second gain block. The line stage consists of a single gain block. These stages use polypropylene capacitors bypassed by a polystyrene capacitor for the output stages. Even the main dc power supplies used polypropylene capacitors – there are no electrolytic capacitors in the audio circuits or their related power supplies. Paralleled triode sections at the phono input yield nearly 3 dB improvements in the signal to noise ratio over a single input tube (as used in the earlier PV5).

Replacement Tube Set RT8

V1 & V2: 12AX7 | V3 & V5: 5751 | V4 & V6: 5965

Features:

Inputs/Outputs

• Phono
• Tuner
• Auxiliary
• Monitor and recording facilities for two tape decks with dubbing from Tape 1 to Tape 2
• One main output
• Auto-muting to suppress warm up transients

Controls:

• Selector
• Tape 1/Tape 2
• Source/Monitor
• Mode (Reverse, Stereo, Mono)
• Balance
• Volume
• Power

Specifications:

• Gain: Stage 47 dB (phono overload 200 mV at 1kHz)
• Line Stage 31 dB
• Distortion: less than .1% THD or IMD
• Response: bandpass 2Hz to more than 100kHz
• RIAA Equalization: +/- .25 dB (20 to 20 kHz)
• S/N Ratio: Phono Stage 76 dB below 10 mv input
• Line Stage 85 dB below 2.5 volt output
• Phase: Line Stage phase inverting, Phono Stage phase correct