Spec.
power consumption: 7W maximum
main voltage: 100V,120V, 200V, 230V or 240V AC@50/60Hz
inputs: 7 stereo single-ended(RCA)
1 stereo single-ended(RCA)phono
outputs: 2 stereo single-ended(RCA)
gain: 14.3 dB
S/N: 105 dB
input overload: 2.34V rms
input impedance: 47k Ohm
outputs impedance: 120 Ohm
maximum output (MAIN outputs): 15.3V rms
frequency Response: 10Hz~100kHz"P-307 is the control center of today's high end sound systems. Its two main functions are source selection and volume control. Every effort has been made to keep P-307 as accurate as possible. To avoid unwanted interactions with adjacent source components, P-307 uses high-quality relays and switching designs to ensure that every source is intact. Thus all sources remain separate from one another and from the power amplifier and cables..."
http://usheraudio.us/?wpsc-product=p-307a-pre-amplifier "The full-size case contains only the signal
part, the power supply unit is a separate module, providing voltage to the preamp via a 4-
contact cable. The signal path utilizes four amplification stages built ofdiscreet elements –
two for the line stage and two for the MM input. Each ofthe stage inputs uses a J-FET
2N3958 double transistor and eight 2N3440, 2N5416 bipolar transistors closed in metal cases.
The source selection is made with Takamisawa microswitches controlled with massive
gauges, welded directly into the printed circuit board. Next, there are two, blue Alps
potentiometers (controlling the volume and balance) and the above-mentioned line stage. At
the output ofthe preamplifier there is a film capacitor ofgreat capacity. P-307 possesses nonsymmetrical outputs only (two pre-out and two rec-out). The preamplifier is powered by
symmetrical voltage ± 35 V, which ensures a great overload distance. 100VA toroidal
transformer, AC filter integrated with the IEC socket, as well as the set oftwo electrolytes
10 000 µF each and a rectifier are contained in an external power supply module. The third
voltage (5V) is used for powering the switches and blue LEDs."
http://www.usheraudio.cz/data/test/15-usher-r1-5-and-p-307a-av-magazine-03.pdf
Works perfectly in 7+ years of ownership, has been my summer pre the last 5 years. Power supply unit has a couple nicks at the top edges, nothing major. Main unit is excellent , faceplate clean. Smoke free home.
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| Payment and Shipping |
| Pay By: |
Personal Check after it clears, Paypal, Money Order/Certified Check |
| Ship Weight: |
14 lbs. |
| Ships From: |
11225 (Brooklyn, NY) |
| Ships To: |
USA Only |
| Shippers/Payer: |
UPS, FedEx, Postal / Paid by: Buyer |
| Shipping Notes: |
Will be double boxed for safe delivery.
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