Preamplifiers

G-72 i

Kondo Audio Note Japan’s single-chassis stereo valve line preamplifier, built around four 6072 dual triodes and the GL7 amplification module used in the G-700i. Pure-silver components, a copper chassis and a redesigned heater supply deliver precise, vivid musical reproduction.

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Key Features

  • Single-chassis stereo valve line preamplifier
  • Four 6072 dual-triode signal tubes
  • GL7 line-amplifier modules derived from the G-700i
  • Parallel-connected 6072 tubes in each channel
  • EZ81 valve rectification
  • Redesigned 6.3-volt heater supply
  • Metal-can 2N2222A and 2N3055G transistors in Darlington configuration
  • Distributed capacitor banks for short signal loops
  • Designed to operate into loads of 20 kohms or higher
  • Three RCA and two XLR line inputs
  • RCA and XLR analogue outputs
  • Pure-copper main chassis
  • Kondo SSW silver internal wiring
  • Pure-silver foil capacitors and silver-lead resistors
  • Silver-palladium-plated RCA connectors
  • Zirconia valve sockets
  • Supplied with an ACz-AVOCADO power cable
  • Carefully hand-wired and manufactured in Japan

Design & Build

The G-72i uses Kondo’s GL7 line-amplification module, the same fundamental module employed in the G-700i. Two 6072 dual triodes are connected in parallel within each channel, supporting stable operation, low noise and expressive musical dynamics.

Capacitor groups are distributed along the left- and right-channel circuits to shorten signal loops. Its redesigned heater supply operates the 6072 tubes at 6.3 volts and uses metal-can 2N2222A and 2N3055G transistors in a Darlington configuration.

Kondo pure-silver foil capacitors, silver-lead resistors, SSW internal wiring, silver-palladium-plated RCA connectors and zirconia valve sockets are installed within a copper main chassis. The gently curved front panel carries the aesthetic language of Kondo’s latest-generation amplifiers.

System Pairing

The G-72i offers three RCA inputs and two XLR inputs for connecting analogue source components. All five inputs are electrically unbalanced, so the XLR connections provide connector compatibility rather than true balanced operation.

RCA and XLR outputs allow connection to a broad range of power amplifiers. Both output connections are unbalanced, and Kondo specifies operation into an amplifier input impedance above 20 kohms.

Technical Specifications

SpecificationDetail
TypeStereo valve line preamplifier
Amplification moduleKondo GL7
Circuit configurationParallel-connected 6072 dual triodes
Frequency response8 Hz–280 kHz (+0/–3 dB, 100-kohm load)
Gain25 dB
RCA inputs3 pairs, unbalanced, 50 kohms
XLR inputs2 pairs, unbalanced, 50 kohms
RCA outputs1 pair, unbalanced
XLR outputs1 pair, unbalanced
Recommended output loadAbove 20 kohms
NoiseLess than 0.15 mV
Signal tubes4 × 6072
Rectifier tubes1 × EZ81
Heater supply6.3-volt circuit using 2N2222A and 2N3055G metal-can transistors
Internal wiringKondo SSW silver wire and pure-silver shielded wire
ChassisPure copper
Included power cableKondo ACz-AVOCADO
Power consumption30 W
Dimensions (W × H × D)340 × 160 × 412 mm, excluding protrusions
Weight17 kg
Country of manufactureJapan

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