EL84 Single Ended Amplifier

6N1 + 6P14 (EL84) Solid Wood Chassis Tube Amplifier U$290

Parameters and specifications

6N1 – 1pc, 6P14 – 1 pair

6P14  = EL84

6N1 = 6922 equivalent 

• Output power: 3.5W / 8 Ohm
• Frequency response: 30Hz – 40kHz +/- 1dB
• Input sensitivity: 800mV
• Noise: <= 5mV
• Operating voltage: 230Vac / 200mA + 6.3VCT / 3A
• Power consumption: 70W
• Input impedance: 10K Ohm
• Output impedance: 4 / 8 Ohm (Z11 – EI57 * 30mm stack OPT)

Notes:
I. Load (speaker) must be connected when the amplifier is switched on. Switching on without load will cause the output transformers and/or tubes to be burned and damaged. This is not covered in the warranty. 

II. Please specify 4 Ohm o4 8 Ohm when ordering.

III. Diode bridge rectification with 6Z4 parallel at output as buffer / slow turn-on, to gain higher output current, protection and tube rectification tonality.

IV. 6P14 is commonly used as output tube in radio receivers. The tone is colorful, full body and nostalgic, especially suitable for vocals.

V. The speaker binding post are gold plated copper, with very thick plating, not those that will easily oxidize or scraped off after several use. Power supply switch is high quality 8A 250Vac rated.

VI. This is a real tube amplifier, and uses output transformers at coupling between tube and speakers. This is not the cheapo fake tube amplifier with fake “tube lamps” as decoration.

Tips

I. A true tube amplifier requires 3 transformers at least – 1 power transformer and 2 output transformers. Such arrangement on our amplifier minimizes the interference between them to the lowest level, ensuring higher SNR. Our amplifiers uses 75W power transformers, and do not hum or do not generate high heat. Output transformers are made of high quality 0.35mm Z11 SiFe from Japan (Z11 has higher permeability and therefore generates higher primary impedance = better bass than those H14, H18 grade SiFe cores).

II. The amplifier is hand made with point to point wiring for every components made. No PCB!

III. The chassis is made of solid ash wood. The solid wood is dried properly before being made into chassis. It is sanded and painted multiple times before being used. The grain is rich and deep, simple and nice. Top plate is 3mm ALU, bottom plate is 1mm ALU.

IV. Size is 25cm W x 30cm D x 13cm H). It weights 5KG. It has ample internal space for further upgrades – change to better oil capacitors or audiophile power supply / coupling capacitors.

V. The power supply uses Philips 150UF, Nippon Chemicon 47UF and 22UFx2 high voltage electrolytic capacitors. High wattage cement resistors + 5H choke are used together with the capacitors to form a CLCRC filter network, to achieve high suppression of power supply ripple. Noise floor is ~2-5mV.

VI. Coupling and bypass capacitors are made in German, WIMA MKP film + antique oil capacitors – high definition and warm. Rubycon from Japan (330UF 35V) are used as cathode bypass capacitor for 6P14. Volume pot is from ALPS Japan, 100K.

VII. The output transformer (5K:4/8) and power transformers are custom made. Quality is stable and reliable. 4 Ohm or 8 Ohm output needs to be mentioned when ordering. Default will be 8 Ohm.

VIII. Output power is 3.8W x 2. It sounded as loud as if it is a 20W x2 solid state amplifier.

IX. This amplifier is suitable for higher efficiency speakers or small bookshelf speakers. Single full range driver will be perfect. The amplifier works in full class A operation, with low distortion, sweet, warm and mellow sound.

X. We ensure safe packaging for the amplifier. The tubes are separately packed.