This is a meticulously restored LUXMAN SQ78 vacuum tube integrated amplifier, rebuilt with a focus on long-term stability and reliability.
The output stage features four vintage NEC 6RA8 triode tubes. To ensure longevity, the operation is set to a conservative 10W output (approx. 60% of maximum plate dissipation). The circuit has been converted from a fixed bias to a self-bias system to prevent thermal runaway.
The power supply has been significantly upgraded with a new choke coil and high-quality capacitors. All coupling and electrolytic capacitors have been replaced with new ones (Shizuki metallized film, etc.). The rectifiers have been upgraded to low-noise fast recovery diodes (UF4001).
The original speaker terminals have been replaced with standard screw terminals for better compatibility, and four L-shaped banana plug adapters are included.
This amplifier provides a transparent and musical sound characteristic of triode tubes and has enough power to drive large speakers like the JBL L300.
Included: Main unit, 4 L-shaped banana terminals, Circuit diagram, and Performance data sheets.
We only accept Ebay managed payments.
Please pay within 3 days after auction is finished.
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Shipping Duration
| Shipping Method |
Asia | North America Central America Middle East AU, NZ |
Europe Russia |
South America Africa |
|---|---|---|---|---|
| Fedex | 2 - 3 days | 2 - 4 days | 2 - 4 days | 3 - 5 days |
| DHL | 2 - 4 days | 2 - 4 days | 3 - 5 days | 4 - 6 days |
Money back guarantee within 60 days if returned by customer.
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Story -
I deal mainly with Japanese fashion, audio, and books.
I earlier, I was a white-collar worker in Japan.
However, I learned that there are many people who need Japanese goods all over the world.
The Internet is popular in the world I decided to sell Japanese goods, resigned the white-collar worker.
Mission -
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I want to see your happy face.
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