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Further information:

Picked this up recently with a few issues. Volume pot was scratchy and remote control didn't work. Have since serviced the volume pot with deoxit, fixed a weak ground connection wire and repaired remote control (the battery connections to the pcb board).

Rectifier tube was a bit weak so have installed a replacement tube in place. The remaining tubes (300b, 12at7 and 6sn7) are all still good.

Comes with optional tube cage and special screw driver for biasing the 300b tubes.

Amp sounds seriously good. Can power my 89db sensitivity JBL 3way speakers very well with full bodied bass, mids and highs.

https://shenzhenaudio.com/products/yaqin-ms-300c-9-5wpc-300b-x-2-vacuum-tube-hi-end-tube-integrated-amplifier
 

Photos:

 

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