Get even more depth with monaural amp conversion
Beautiful mirror finish appearance and maximumHigh-FidelityAn ambitious work in pursuit of
A monaural amplifier that realizes the depth and high output of KT88 tubes.
ASTORhas renewed its lineup of high-grade amplifiers to all monaural specifications. This product, AST-KT88MVIP/SP, achieves higher output power and deeper acoustic performance by converting a stereo amplifier into a monaural amplifier. It is particularly effective in improving acoustic performance when driving highly loaded speakers, and maximizes the potential of the KT88 tube, which has a wide output range.
Improved audio symmetry and ease of installation
If the sound field is unbalanced during stereo playback due to room acoustics or speaker placement, converting to monaural is effective. By integrating the outputs of both channels, monaural amplifiers can obtain a uniform and stable sound field and improve audio symmetry. Another advantage that cannot be overlooked is that each unit weighs less than half (compared to the company) compared to full-size stereo amplifiers, which are heavy and bulky, making installation and handling extremely easy.

Robust construction: Mirror stainless steel and oxygen-free copper chassis
Beautifully mirror-finished 1.6mm thick high-quality stainless steel chassis and 1.5mm thick oxygen-free copper with clear finish for the steel plate used to attach parts.Robust constructionWe are pursuing This thorough structure prevents resonance from inside and outside and provides noise-free and highly transparentHigh-FidelityContributing to

The transformer pursues sound quality without compromise while keeping the price down.original transformerThe input/output terminals are gold-plated high-quality terminals.

Unique circuit that achieves sound quality equivalent to fixed bias
For the self-bias capacitor, compared to the general manufacturer's specifications (200 to 400 microns), this machine uses a capacitor of 4000 microns, which is an order of magnitude larger. As a result, we have succeeded in obtaining the same sound quality as fixed bias even though it is self-biased. Additionally, the use of UL connections increases output power, contributing to improved sound clarity and resolution. A click-type 31-contact attenuator is used for volume, allowing precise control.

Compatibility with various vacuum tubes and best performance
This machine is characterized by its high versatility, allowing you to easily replace and use compatible vacuum tubes such as KT88, KT120, and even KT150 and KT170. By trying out various tubes manufactured by vacuum tube manufacturers around the world, it is possible to bring out the best performance that matches the characteristics of the device and the listener's preferences.

| Vacuum tube used | KT88×2 12AU7×2 12AX7×1 |
|---|---|
| Used transformer |
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 |
| output |
KT88, 6550, KT120: 30W×30W Load resistance 8kΩ KT150, KT170: 35W×35W Load resistance 8kΩ |
| Connection circuit type bias | UL connection/self bias |
| Frequency characteristics | 10Hz~60KHz |
| residual noise | 1mmV or less / 1W |
| distortion rate |
KT88, 6550, KT120: 0.28% / 1W KT150, KT170: 0.26% / 1W |
| input impedance |
|
| input/output | INPUT×1, speaker terminal 0-8-16Ω |
| size | W 320 x D405 x H215mm |
| weight |
KT88, 6550, KT120: Approx. 15.7kg KT150, KT170: Approx. 17kg |









