Introduced in 1977 by Bill Conrad and Lew Johnson, the conrad-johnson
preamplifier, later designated the PV1, was an important factor in the revival
of the preeminence of vacuum-tube audio components in high-end audio.
Already with their first product, conrad-johnson was emphasizing the critical
importance of the quality of component parts. The original PV1 literature noted
the use of "metal film resistors and polyester and silvered mica capacitors".
Critics of the day regarded the PV1 to be one of the best sounding preamps at
the time, particularly noting its natural reproduction of musical harmonics.
Built on a rugged chassis with a robust power supply, a great many PV1’s are
still in use today!
Inputs/Outputs - 2 Phonos; 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 (Left, Right, Stereo, Stereo Reverse, Mono),
Balance, Volume, Power.
V1, V2, V3, 12AX7 / ECC83 (Silvania)
V6 12AU7 / ECC82 (RCA)
V4 & V5: 5751 (GE)
Gain: Phono Stage 35 dB (phono overload 500 mV at 1kHz)
Line Stage 28 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: Phono Stage is phase correct, Line Stage is phase correct
Mechanical: 14 x 4 3/4" x 11 1/4"
PHONO 1: fitted with HQ INPUT TRANSFORMERS Matching MC-Pickups. (Hiraga)
Output Stage: Modified with ECC82 for lower Impedance, higher Overhead.
Output Level: into 10kOhms, > 20Vrms without Distortion.
Refurbishing / Repairs:
Power Supply fitted with new Electrolytic Capacitor, greater Value to increase
Performance & Stabilty. Some minor adaptions to meet todays 230V Mains.
All Tubes checked on Funke W20, in best Condition!
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