The Proteus ~ Proteus specifications

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All figures are for continuous operation.

Valve (tube) complement

4 X KT90 Tetrode, output valves
4 X 12BH7 Double Triode, driver and input valves
1 X EL84 HT Pentode, regulator element.
1 X 2PN6 HT Double Triode, regulator driver.
6 X E813CC Planar Double Triode, line and phono stages.

All valve bases are CMC precision "machine turned" solid brass socket pins mounted in Bakelite holders.

Power Output

Gross 32 Watts RMS after clipping
Net 27.5 Watts RMS at onset of clipping.

Total Harmonic Distortion at 1 kHz into 10 ohms load

3 Watt <0.03%
5 Watt 0.05%
20 Watt 0.08%.

Frequency spectrum

<4 Hz to 35 kHz.

Input sensitivities

Four switched line inputs-
215 mV at 180 K Ohm input impedance.
Overload margin into clipping - 3.7 V RMS

Phono Stage-
Standard phono input for moving magnet cartridges; 2.5 mV at 50 K Ohm input impedance.
Included, outboard 10:1 step up transformer for Moving Coil cartridges;
250 micro volts at 470 Ohm nominal input loading. 
Three sets of loading plugs are supplied for; 100 Ohm, 50 Ohm and 20 Ohm. Other values may be ordered from PAD Ltd if required.
RIAA performance to within 1 dB accuracy.

Hum and noise

86 DB.

Phono stage, Moving Coil

Input sensitivity 250 micro volts at 1 K Ohm
RIAA performance to within 1 dB accuracy.

Speaker impedance's catered for

Supplied nominally at 8 Ohms
2, 4, 8, 16 Ohms selected by internal jumpers
Any impedance between 2 and 20 ohms in two Ohm steps can be requested during manufacture.
Heavy Duty "Clutch Grip" insulated solid brass terminal posts will accept 4 mm plugs and or bare ended cable.

Mains consumption

Running 280 Watts
Standby 120 Watts.

Dimensions

Size in mm; 609 wide, 305 deep, 230 high
Weight; 33 Kg.