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ASTOR AST-KT88MVIP Monaural Power Amplifier

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ASTOR AST-KT88MVIP Monaural Power Amplifier

Regular price $5,449.00 USD
Regular price $5,449.00 USD Sale price $5,449.00 USD
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The product will be made-to-order, and the delivery time will be around 3 months.

Gaining further depth by monaural amplification

An ambitious work that pursues a beautiful mirror-finished appearance and the highest sound quality


ASTOR has revamped its lineup of high-grade amplifiers to all monaural versions. By converting stereo amplifiers to monaural amplifiers, higher output power and deeper sound can be obtained. This is especially effective in improving acoustic performance when driving highly loaded speakers. When the sound field is unbalanced during stereo playback due to room acoustics or speaker placement, mono conversion integrates the output of both channels to obtain a uniform and stable sound field,

Audio symmetry can be improved.


The AST-KT88MVIP is 5cm narrower than the MVIPSP.

Beautifully mirror-finished

The 1.6mm-thick high-quality stainless steel chassis and component mounting mid-plate steel are

Clear Finish

The robust construction with 1.5mm-thick oxygen-free copper prevents resonance from both inside and outside, contributing to noise-free, crystal-clear high sound quality.

The transformer uses an original transformer that pursues sound quality without compromise while keeping the price low. Gold-plated, high-grade terminals are used for input and speaker output terminals.

For the self-bias capacitor, the AST-KT88MVIP uses an order of magnitude larger capacitor (4000 micro) compared to the 200~400 micro capacitors used by most manufacturers. This allows the AST-KT88MVIP to have the same sound quality as a fixed bias, even though it is self-biased. The AST-KT88MVIP can be replaced with various KT88, KT120, and other compatible vacuum tubes manufactured by tube manufacturers around the world without any hesitation to bring out the best performance.

In addition, the use of UL connections increases output power, contributing to improved sound transparency and resolution. The volume is controlled precisely by using a click type attenuator with 31 contacts.

Tubes used KT88 x 2 12AU7 x 2 12AX7 x 1
Transformer used

KT88, 6550, KT120: AST-165P×1 TOR-40PP×1 ST-1.5-200M×1

KT150, KT170: AST-170PB×1  TOR-50PP×1  ST-1.5-200M×1


KT88, 6550, KT120:30W x 30W load resistance 8kΩ

KT150, KT170: 30W x 30W35W x 35W Load resistance 8kΩ

Connected circuit type bias UL connection / self-bias
Frequency Response 10Hz~60KHz
Residual Noise Less than 1mmV / 1W

KT88, 6550, KT120: less than 1mmV / 1W0.028% / 1W

KT150, KT170: 0.026% / 1W

Input impedance
Click type, 31 contacts, Type A, 100KΩ
Input/output INPUT x 1, speaker terminals 0-8-16Ω
W 270 x D405 x H215mm

KT88, 6550, KT120: approx. 14.7kg

KT150, KT170: approx. 16kg