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Re:TU-870R 6BM8 Tube AMP Kit.

64.180.25.87

Upgrade Option (sold separately)

This set includes a tube protector to decorate and an electrolytic capacitor for bringing it up to specification. This meshed protector brings out the TU-870R design and also this prevent you from touching the vacuum tubes by accident. Electrolytic capacitor reduces 30~40% residual noise by installing it on the "OP-C" of the circuit board. (S/N ratio improved)

Features:

This is a single stereo power amplifier using the 6BM8 vacuum tube that has a five triode for power amplification and a triode for amplified voltage. Assembly is easy. Anyone can follow the printed circuit board and obtain the same result. For this reason, you do not need to know the details of wiring and other technical details to assemble a vacuum tube.

This amplifier installed with advanced "R-core transformer" as a power transformer that enables clear tone quality. To improve transient characteristics.

This set includes a tube protector to decorate and an electrolytic capacitor for bringing it up to specification.

This meshed protector brings out the TU-870R design and also this prevent you from touching the vacuum tubes by accident.

Electrolytic capacitor reduces 30~40% residual noise by installing it on the "OP-C" of the circuit board. (S/N ratio improved)

Specification:

Vacuum tube : 6BM8 x 2
Rated output : 2W + 2W(8Ω)
Rated input : 600mV
Input resistance : 45kΩ
Residual noise : 80μV(IEC WEIGHTING)
S/N ratio : 94dB(IEC WEIGHTING)
Frequency response : 26~37,000Hz
Power voltage : AC120V 50 / 60Hz
Power consumption : 35W
Dimension : W130 X H130 X D263mm (including projections)
Weight : 2.9kg
Input terminal : Line x 2 (RCA pin jack)
Fuse : 1A
The package included both the 100V & 120V R-core power transformers.

Follow Ups:

Re:TU-870R 6BM8 Tube AMP Kit. - ncuzdvarga@gmail.com 02:25:50 05/19/12 (0)
dear sir.
I need to learn about tube amp and i want to build it start from the little one. i hope you can help me.
thank's very much
RE: Re:TU-870R 6BM8 Tube AMP Kit. - Keith L. Jackson 17:43:34 02/24/10 (0)
Here are a number of google translated links on the TU-870 amp. Many good photos, but translations are hit and miss. My favourite is...

"All the pigs behind the incident so screw OK. Us, try to fix the power switch from a slightly oblique to the front. Fingers from the back, fasten with a pen from a table radio. Sho Yeah. Sharply. Gah my plans broken switch. Forget to take pictures of the little shock. Now, to repair the powerful bond, one waits until complete freezing days."

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RE: Re:TU-870R 6BM8 Tube AMP Kit. - stickers11 22:31:04 01/26/10 (1)
Can someone explain this for me:
has a five triode for power amplification and a triode for amplified voltage

So this amp uses two triodes, but I don't understand the difference between "power amplification" and "amplified voltage". I am just learning about tubes, but am fascinated about the subject. I take it this is then not a SET design?

Thanks,
Matt
- RE: Re:TU-870R 6BM8 Tube AMP Kit. - vkung 23:21:54 01/26/10 (0)
  6BM8 is a combination of a triode and a pentode. In this tube, the triode part works as an audio pre-amplifier (amplified voltage) that feeds the pentode (Power amplification) section which acts as an audio main-amplifier.
  Your Question
  power amplification (Pentode)
  amplified voltage (Triode)
  Voltage amplifiers are distinguished from other categories of amplifiers whose ability to amplify voltages, or lack thereof, is of secondary importance. Amplifiers in other categories usually are designed to deliver power gain (power amplifiers, including push-pull amplifiers) or to isolate one part of a circuit from another (buffers and emitter followers). Power amplifiers may or may not have voltage gain, while buffers and emitter followers generally produce power gain without a corresponding voltage gain. Power amplifier; Push-pull amplifier.
  
  Edits: 01/26/10
RE: Re:TU-870R 6BM8 Tube AMP Kit. - vkung 15:08:51 01/21/09 (0)
Yes, this 4 inches speakers are designed for this AMP.
RE: Re:TU-870R 6BM8 Tube AMP Kit. - FredT 15:06:12 01/21/09 (0)
Nice looking amp to go with the diy wood cone speakers, appearance wise, but I wonder if they have enough juice to drive them?

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