Final Sales on 6F3 Mini Tube Amplifer (SOLD OUT & Discontinued) - diyAudio
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Old 26th October 2010, 04:12 PM   #1
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Default Final Sales on 6F3 Mini Tube Amplifer (SOLD OUT & Discontinued)

We are pleased to introduce a creative mini tube amplifier, APPJ 6F3 class A single end integrated amplifier. This is a unique design and production of 6F3 or ECL85 triode-pentode tube amp in the world. The circuit is simple and makes use 6F3's triode as amplifying stage driving its own power pentode and deliver 2.5 Watts output per channel. So only single 6F3 tube for each sound channel is needed in the tube amp. An advanced switching power supply in the amp is very compact size. All of these elements achieve the smallest sized tube amp in its class and is very suitable for the application of desktop CAS audio system.

The high quality aluminium alloy chassis was specially designed and custom build. It is so fashionable and sexy. 5 colors chassis in matt gold, matt silver, pink, black and cool grey are available for selection now.

The international voltages, 100V-240Vac on the switching power of the 6F3 amp make users easily and conveniently plug and play the amp anywhere in the world.

6F3 are China made tubes which were produced in Shanghai in 1970s. 6F3 can be directly replaced by vintage European ECL85, ECL805, American and Japanese 6GV8 and Russian 6F5P. Users can select those tubes according to personal musicial tastes and easily buy from ebay.

Have fun.

Technical Specification of 6F3 mini tube amp:

Output power: 2.5W+2.5W@ 8 ohms
Frequency Response: 30Hz-40KHz (+/-1dB)
Input Sensitivity: 800mV
Residual Noise < 0.6mVac
Input AC Voltage: 100V-240V
Input Impedance: 10K ohms
Output Impedance (speaker output): 4/6/8/16 ohms
Output Transformer: Japan Z11 EI48*24
Power Consumption: 33W
Dimension: 132mmW x 122mmD (with RCA & knob) x 170mmH (with 6F3 tubes)
Weight: 1.8 KG
Input: RCA jacks
Output: Banana jacks
AC: Standard IEC with power switch and fuse (2A).
Note: Power cord is not included in the package. Tubes are very hot in working condition, keep out from children.

Now, Twin Audio is one of the dealers of APPJ and selling this special 6F3 mini tube amp. The promotional price we offered in Diyaudio is USD150. Air parcel rate is USD25-USD35.

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Last edited by Musik007; 5th November 2010 at 06:02 AM.
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Old 27th October 2010, 03:57 AM   #2
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APPJ's state-of-the-art circuit design and pcb layout with the use of high quality components for audio give high performance on sound quality.

This is 6F3/ECL85 tube amp module which is excellently designed and well-organized in a very limited space. The power supply and audio section are separately installed on individual pcbs with effective shielding and heat sink.

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Last edited by Musik007; 28th October 2010 at 04:02 AM.
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Old 29th October 2010, 03:19 AM   #3
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The price of the mini tube amp, USD150 with Chinese 6F3 tubes is the very special price we're offering for Diyaudio memebers. The regular prices of the 6F3 mini amp are between USD198-USD220. Can select colors from the 5 choices.
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Old 31st October 2010, 02:57 AM   #4
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This is amazing pink color.
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File Type: jpg 6F3-02.jpg (76.2 KB, 228 views)
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Old 31st October 2010, 04:30 PM   #5
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I visited APPJ factory in Shenzhen, China where is near to Hong Kong. This is a small factory, but very organized. 6F3 mini amps are being made now and already sold hurdreds of units to overseas.
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File Type: jpg APPJ-1.jpg (792.2 KB, 527 views)
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Old 31st October 2010, 04:49 PM   #6
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APPJ's owner, Mr. Jiang is a engineer of switching power supply and worked in the industry for over 10 years. He is also a engineer of tube amplifier. Mr. Jiang is the first one who make good use of switching power supply in tube amps. Without switching power transformer, it is impossible to make tube amp in such small size because the traditional power transformer is big.

This is the switching power supply with its servo circuit and components.
Attached Images
File Type: jpg APPJ-2.jpg (787.6 KB, 594 views)
File Type: jpg APPJ-5.jpg (778.5 KB, 393 views)
File Type: jpg APPJ-9.jpg (816.0 KB, 527 views)
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Old 31st October 2010, 05:18 PM   #7
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Mr. Jiang designed the pcbs of 6F3 amp including this audio circuit. They buy well-known brands' components. Can see Japanese Nichico 200uF/200V caps as cathode caps, blue Rifa 0.1uF caps in coupling stage, ALPS volume control, Z11 output transformers.... All of these are newly produced, not stock item, not cheap Chinese caps. APPJ only uses reliable and stable components into their tube amps. The quality and life of APPJ amps are guaranteed.
Attached Images
File Type: jpg APPJ-3.jpg (805.6 KB, 563 views)
File Type: jpg APPJ-4.jpg (786.8 KB, 338 views)
File Type: jpg 6F3-07.jpg (74.3 KB, 256 views)

Last edited by Musik007; 1st November 2010 at 02:09 AM.
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Old 2nd November 2010, 04:14 PM   #8
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Every 6F3 PCB is tested before assembly.
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File Type: jpg APPJ-10.jpg (801.8 KB, 485 views)
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Old 4th November 2010, 03:59 AM   #9
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There are some test equipments for measuring and testing tube amps in APPJ.
This is a distortion instrument for amplifiers and a LCR tester for transformers.
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File Type: jpg APPJ-12.jpg (804.1 KB, 476 views)
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Old 5th November 2010, 05:56 AM   #10
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Distortation instrument.
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File Type: jpg APPJ-13.jpg (797.7 KB, 226 views)
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