1. This is a real combination amplifier with forestage. The previous level consists of five electrode tube EF183Composed6N8PTwo-stage voltage amplification, plus300B
2. The output is amplified.
3. 300BNo negative feedback, working point400V,80mA, strong drive300BCan work inA2In the class state, the cathode uses constant flow source stable operating points, and you can change any300BTube, no need to make any adjustments.


4. All AC filament, Lao Cao's new generation ac filament module, output noise prototypeAThe measured weight is less0.2mV.20HZ-20KHZBroadband noise0.6mVLeft and right. The filament adopts soft start circuit to avoid the impact of the high-current startup of the filament. Theoretically, the filament has a long service life.2More than twice.


5. Large output cattle are used,EIType114Stack thickness50的HiBIron core, the maximum undistorted power reaches14W(8Ou,1KHZ,10%Distortion), measured prototype10WOutput distortion is4%Left and right.


6. 4Group audio source input, relay switching.


7. 60Volume switching, each gear1dB. Front level6Gear, every gear12dB, between the front and back levels,12Gear, every gear1dB.ALPS的6Step Switch, customized by Taiwan-owned factory12The pure copper step switch is connected first and then broken. There is no switching noise at all. Long service life, which perfectly solves all the problems of band switch.


8. This machine is probably the most complex300BSingle-ended amplifier.4Group high voltage power supply, two groups of filament, also with meter head drive circuit.


9. The features of this machine are comprehensive and balanced, in addition to maintaining300BBesides the original transparent, natural and delicate, it has quite good control and low frequency diving.

Technical parameters of the whole machine:
1. Four sets of RCA input
2. Output: 4 euros, 8 euros (16 euros, 8 euros, or other impedance can be customized)
3. Maximum output power:
14W × 2 (8 ohm, 1kHz, 10% distortion)

4. Frequency response: 20HZ-20KHZ -0.4dB(8 ohm, 1w)
5. Output noise:<0.8mV(20HZ-20KHZ broadband)
<0.2mV (A right)
8. Overall size: 430 × 390 × 220mm (width, depth and height)
9. Net weight: 25.5KG

Measured parameters:

1,1W power frequency response:

2: output power VS distortion:(8 ohm, 1kHz)

2:

3:A weighted output noise: