Boyuurange Reisong A50 Mk III 300B amplifier

2 years ago 262

Item Condition: Excellent

Shipping Options: Pickup available and you can audition.,Shipping is available at agreed cost.

Suburb or Town: Chisholm NSW

State: NSW

Payment Method: EFT or cash

Reason for selling: Downsizing

Further Information

This is an immaculate, pre-Covid era, 230V version with the far superior Japanese iron. There is no power issue and it performs and sounds as a 300B amplifier should. 

It comes with the the following tubes which are all in excellent condition:

Psvane 300B x2

Sovtek 6SN7EH x2 (Russia)

Winged C 5u3C OTK rectifier x1 (I tried a few different rectifiers and this one sounds awesome. Must just be a synergy with the power output)

Shuguang 5Z3PA rectifier x1 (OEM)

Shuguang 6N8P x2 (OEM)

I have a brand new pair of TJ Full Music 300B/n. This version is the very highly regarded "mesh plate" famous for its incredible midrange. These are $500 extra if wanted or will swap with a SNer for a pair of nice new 2A3s of equal value.

Modifications:

The OEM coupling caps were replaced with Mundorf EVO Aluminium Oil. I did not deem any other mods to be necessary for this amp. (Later models may definitely require some work). OEM caps are Nichicon or Rubycon.

Specification:

Voltage amplification and promotion tubes: 6N8P (6SN7) × 2

Power output tube: 300B × 2 

Rectifier: 5Z3PAT × 1

Japanese ALPS volume pot

Output power: 7.6W x 2 (Class A) (No negative feedback)

Frequency response: 30Hz-42KHz

Output impedance: 4Ω, 8Ω

Total harmonic distortion: ≤1% (1kHz)

Input sensitivity: 750MV

Input impedance: 100KΩ (3 groups of input jacks)

Volume: 375 W x 290 D x 180 H mm

Packing volume: 500 W x 450 D x 290 H mm

Signal to noise ratio: 89DB

Input Power Voltage: 230VAC 50Hz, fused

Net weight: 18 kg

Gross weight: 21 kg

Pick up from Chisholm 2322 NSW or can ship to anywhere in Australia, well-packed with insurance. 

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