MalValve - Power Amp One

Head amp one Stereo power amplifier with head driver for electrostatic + magnetostatic + dynamic headphones external output transformers for loudspeakers

Design * Construction . full tube technique in signal path · completely balanced signal processing in all modes · balancing unbalanced input signal · galvanic isolation by input transformer coupling · parallel push-pull design · triode- or pentode operation · class A-operation in the lower and mid power range · transformer impedance much lower as an anode amplifier · high stability and low distortion also at critical loudspeaker impedance process · best compatibility also with magnetostatic and electrostatic loudspeakers · high impulse fidelity also at low bass range and highest range · all switch processes relay-controlled (no capacitive cable influences) · start-up power limiter · optional direct output for electrostatic headphones (Stax) · external output transformers for positioning near to loudspeakers (option)

Tubes * Power transformers · 6 x ECC81 tubes · 4 x EF 184-tubes · 4 x KT120-tubes · 1 x 800 VA (W) toroidal core power transformer

Features

· 2 x input transformer with MU-metal-shielding
· 1 x mainboard
· 7 x circuitry modules
· 1 x power suppy

Accessories

· 2 x external strip-wound core transformer
· 2 x 1 m shielded balanced transformer cable
· power cable (2 m)

Specifications

· balanced input
· unbalanced input
· input impedance
· input sensivity
· balanced power output
· output power
· high voltage output
· max. output voltage
· total harmonic distortion (THD)
· frequency response
· signal-to-noise ratio
· power supply
· power consumption idle
· power consumption full power
· standby

1 x Stereo line
1 x Stereo line
470 kOhm
2 V (RMS)
1 x XLR-socket per channel
2 x 100 W at 4/8 Ohm of the output transformer
2 x special sockets for Stax-Pro headphones
1400 Vpp
< 0,3 %
10 - 60.000 Hz
> 90 dB (A)
230/115 VAC, 50 - 60 Hz
250 Watt
600 Watt
0,3 Watt

Connectors

· 2 x gold plated cinch sockets
· 4 x gold plated XLR-sockets
· 2 x special sockets elektrostatic headphone (Stax)
· 1 x AC power socket

Switches

· rear panel toggle switch on - off
· toggle switch for balanced or unbalanced input
· toggle switch triode - pentode for mode selection
· toggle switch for loudspeaker or headphone mode

Amplifier housing

· 10 mm aluminum chassis brushed, black or natural anodized
· 10 mm aluminum transformer cover black or natural anodized
· chromed polished brass product badge with gravure

· dimensions:
· weight:

400 mm (Ø) x 70/210 mm (H)
22 Kg

Options

· direct output for electrostatic headphones (Stax)
· output transformers for loudspeakers
· head driver for magnetostatic and dynamic headphones
· transformer cables in overlength
· extra loudspeaker impedance
· transformer cover polished and chromed

Output transformer for loudspeakers

· downward transformation for power adjustment for loudspeaker impedances
· low internal resistance for best impulse processing
· big magnet core of 1.500 VA
· low transmission for best impedance transformation
· primary and secundary coils for better coupling multiple encapsulated
· separate secundary coils for best transmission characteristics
· best rectangle properties and wide frequency responce
· placeable near a loudspeaker and thereby shorter ways for loudspeaker cables
· standard version 4/8 Ohm

Connectors

· gold plated XLR-socket input for balanced signal transmission
· gold plated separate +/- pole terminal for balanced loudspeaker connection
· minus pole terminal is carries signal and and can only be connected symmetrically

Transformer housing

· 10 mm aluminum chassis brushed and black or natural anodized

· dimensions: 2 x Ø 250 x 200 mm
· weight: 20 kg

Transformer cable

· balanced NF-connecting cable
· 2 x parallel conductors with common shielding
· conductor made of pure copper litz wire
· single isolated litz wires
· shielding made of tinned copper braid
· complete Teflon construction
· gold plated XLR-plugs
· yellow identifier ring
· copper cross-section 2 x 1,5 qmm
· cable capacity 50 pF/m
· wave impedance 110 Ohm
· configuration: Pin 1 = signal minus, Pin 2 = signalplus, Pin 3 = shield
· max. voltage 1.500 VAC
· max. power 10 A
· length on desire
· max. length 20 m
· service: change to all cable lengths

Head amp one

Stereo power amplifier with head driver for electrostatic + magnetostatic + dynamic headphones external output transformers for loudspeakers

Stereo power amplifier with
head driver for electrostatic + magnetostatic + dynamic headphones
external output transformers for loudspeakers