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The main factors affect the sound quality of vacuum tube amplifier

1. Single-ended and push-pull circuit.

At the end of the power amplification, amplification of push-pull is easier to get high power output, because push-pull is a vacuum tube amplifier "+" signal, a vacuum tube amplifier "-" signal, and then superimposed, so large distortion. Single-ended amplifier is a vacuum tube amplifier "+, -" signal, does not need the signal superposition, therefore less distortion. The sound Single-ended than push-pull good, especially in some minor details. However, Single-ended is difficult to obtain high power output, with vacuum tubes of the same type, Single-ended can do 10W, while push-pull is easy to do 30W, Single-ended to obtain large power will have to pay more price.

2. push-pull end power amplifier of vacuum tube different connections

push-pull the end of the power amplifying vacuum tube usually have three connections: triode form, super linear form and standard form. Theoretically speaking, the triode form by minimum distortion, output power is minimum; standard form get larger distortion, power is also the maximum; between super linear form between..

3. Affect the power transformer and output transformer of sound

High quality vacuum tube amplifier inseparable quality transformers, power transformers currently technically no trouble, the output transformer is the decision of the vacuum tube amplifier sound quality is the key. Because regardless of the output transformer selection is good, how sophisticated technology, both methods exist to avoid leakage inductance and stray capacitance components, resulting phase distortion. Output transformer as inductive element, to the transmission signals of different frequencies have different inductance. Therefore, the output of the transformer will be different in different voices lead. No high-quality output transformer, other aspects of the production of better quality vacuum tube amplifier is also meaningless.

Cayin M-845D Top Split type Mono vacuum tube amplifier Pre-amplifier 300B Post-amp 2x845 class A push-pull power amplifier

1.Pure vacuum tube circuit, hand soldering,Pure manual welding,

2.Using a special Pre-amplifier transformer,and Using a special toroidal power transformer,

3.Using a special toroidal power transformer,

4.Pre-amplifier using 1×6SN7 power supply,

5.Pre-amplifier uses 2×Full music 6SN7,

6.Pre-amplifier using the Full music 300B do a single-ended Class A amplifier,and Post-amp Promoting high-quality transformer power with 845 do a push-pull Class A power amplifier tubes ,

7.Have the NFB. Negative feedback selection: NFB.-0dB NFB.-2dB NFB.-3dB NFB.-4dB NFB.-5dB,

8.External 845 vacuum tube current adjustment (BIAS ADJUSTMENT), monitoring form (BIAS) and Hum adjustment (HUM BALANCE) function,

9.Have BLANCE, RCA input,

10.With high and low voltage power supply function and delay filament preheat function and prolong the life of the vacuum tube,

11.Using silver-plated signal wire..

Product parameters:

Model M-845D

Output power 60W

Whole machine frequency response: 15Hz~ 28kHz (-3dB)

Harmonic distortion: 0.3% (1W/1kHz; 5% under rated power)

Power supply voltage: ~ 220V±5% 50Hz

Power consumption: <380w< span=*">

Signal to noise ratio: 89dB

Input sensitivity: RCA: 750mV; BALANCE: 1500mV

Volume; 480mmx577mmx 252mm(WxDxH)

Net weight: 50kg

Output impedance: 4Ω, 8Ω, 16Ω

Input impedance: 100KΩ

Use vacuum tube: 845x2, 300Bx1, 6SN7x3

Input terminal: BALANCE; RCA

Negative feedback options: 0dB, -2dB, -3dB, -4dB, -5dB

recommendation pre amplifier

CayinM-11LS vacuum tube preamp

Vacuum tube amps the use of attention:

1. Disable output short circuit and output load, before you start you must first connect speakers or headphones, the best is always keep them connected,

2. Start with minimal volume,

3. The supply voltage should be stable, with the use of conditional HiFi clean power for better protection and sound,

4. When the vacuum tube amplifier operating temperature is high, pay attention to ventilation, not to touch hot tube,

5. Do not put water on a hot vacuum tubes,

5. Do not put water on a hot vacuum tubes,

6. Boot and shutdown interval of 5 minutes,

7. Do not over 6 hours of continuous work,

8.6 ohm speaker connected to the 4 ohm, 8 ohm interfaces are available,

9. vacuum tube amplifier sound 40% depending on the power amplifier tube quality, 40% depends on the quality of output transformer, 10% depends on other electronic components quality, 10% depending on the manufacturing process,

10. power supply voltage can be free custom (please consult).