IWISTAO Blog is the official platform of IWISTAO HIFI MINIMART, dedicated to high-fidelity audio and DIY electronics. We focus on tube amplifiers, output and power transformers, speaker enclosures, and Bluetooth audio technologies, including HiFi Bluetooth speakers, headphones, and tube-based acoustic systems. The blog shares product insights, technical knowledge, and practical guides for audiophiles and audio builders worldwide.
After the previous version of this Tube FM Radio Head hit market, we have upgraded it with the new version, and keep its features of high sensitivity and high fidelity sound.
Now we added a digital display, you can display and adjust frequecy point of FM station.You only solder it on the main board-- tube FM radio haed board, and short the wire of signal input, the digital display board can induce the FM point and display it, so easy!
Create beautiful sound from preamplifier and output strong power by power stage
Tube 6N3 is a medium u double triode, which
is thick tube taste, and use to make tube preamplifier or tube headphone
amplifier. Its performance parameters are same as the United States 5670,
Russia 6H3, do it can be replaced by them directly.
Tube 6N3 is indirectly heated oxide cathode
twin triode type, mainly used for high-frequency voltage amplification. Its
internal structure is fully symmetrical, which makes 6N3 has excellent
high-frequency characteristics, and sound localization. There was a shield,
which makes 6N3 has a high Signal to Noise Ratio, which is very important in tube
preamplifier designing. If you want to make a tube preamp, AC noise is loud, even
its sound good, always fly in the ointment. But 6N3 has shielding layer, let the
murmurs can’t be hardly heard when you touch your ear to speaker. As its distortion
is even-order distortion, it let the sound of 6N3 is more comfortable when you listen
music for a long time. At the same time, it can significantly improve
distortion that the output of 6N3 adopts current feedback, let its sound be high-fidelity,
and taste particularly strong tubes, musical and strong infection.
On the other way, TDA1521 is low distortion
and high stability chip by Philips designed. The power output of TDA1521 is 2 x
15W at AC ± 16V voltage, impedance 8Ω, its Input impedance is 20KΩ, input
sensitivity is 600mV, SNR is up to 85dB. Also, the circuit set up functions of waiting,
muted, overheating protection, low offset voltage, high ripple rejection and
low thermal resistance, excellent resolving power of high frequency and low
intensity. Its pure transparent sound, intensity White chunky bass, treble
clear and bright, very tube charm.
Therefore, this hybrid tube amplifier is 6N3
as a preamp, TDA1521 as a power amplifier; so that the two parts complement
each other, exert hybrid tube amplifier characteristics, namely to create
beautiful sound from preamplifier and output strong power by power stage.
Further, that is, the preamp section of power
amplifier to use tubes amplify sound signal, enabling the input audio signal
has a good sound performance as bright treble sound, full midrange, mellow and
elastic bass, relatively "warm" sound and high dynamic range, with
sound natural, lifelike characteristics, while overcoming tube amp music
playback seem stiff enough with compared to transistor amplifier; the power amplification
section to use transistor or power amplifier IC amplify the sound signal then output
to ensure the speed and power to overcome pure tube amp sound "sense of
speed" is not strong when playing fast-paced music does not make satisfied
people's weaknesses.
The hybrid tube amplifier has three kind of
signal inputs, CD , Aux and support U disk, SD card that support MP3 / WMA format
files playback. You can connect the amplifier with PC or notebook, smartphone to
play lossless format music like as WAV, FLAC,APE that played by music player through
aux input as a desktop audio or PCHIFI amplifier, it will give hifi music enjoin and excellent experiences.
Workmanship and choice of materials are
very cautious, used a double-sided fiberglass PCB, low loss transformers,
excellent vacuum tube and full brushed aluminum casing. Sound authentic, no
deliberate modification, nor omission, is a good partner of full-range speaker.
Internet technology had changed our life now.But radio always company us from its born to now, and it always keep up with the times, its family has new member -- WIFI radio except Short Wave, Medium Wave, FM one that can receive ten thousand stations from internet to play stream medias.So, you can listen to the world except your mother language.
Normally, the popular radio stations had been burned inside, and you only select a storaged station and play it, or add your favorite station into the radio by yourself.You can listen hot news, pop music, talk shows, and so on. Of course, it support FM radio,wireless connection that become more and more popular now. Also more functions had been added into it, like as Clock Alarm function, Snooze, maybe some models intergrated with Bluetooth funcion, you can use it as Bluetooth speaker.
There is this kind of WIFI radio now. The casing of this WIFI Radio is made of wooden, so it can achieve better quality sound, support Aux in and earphone output.
It is just a nostalgic mood for tube stereo FM radio head kit
Maybe, it is just an other nostalgic mood for the tube FM radio head, even most of FM radio that is made of ICs today. But, When you put the tube FM radio head or use a casint to install it inside,and then turn tuning the quadruple air capacitorto listen, it seems to have returned to the old days of childhood, everything becomes more and more comfortable.
At this moment, you are listen the warm and soft sound from it, perherps broadcast content has become less important, it is important that but it is one with the thoughts that fly mood. . . . .
This tube FM radio head kit had been hit market now, you only will connect a power transfomer, amplifier system, speaker. Of course, it is best that the tube radio head kit is installed in a casing, we will release a completed tube FM head later.
The upgrade version
The previous version
This tube FM radio head adopted tube 6C11. Its signal reception and treatment adopted classical tube circuit, Exclude the mono FM signal output, it also used TA7343 as a stereo decoder that then result in stereo output if you need listen stereo FM signal. After FM signal input power amplifier system for amplification, you will listen to FM radio with musical tube sound.
Wireless Bluetooth Class A Single-ended Tube Amplifier
Would you like to get a tube amplifier that is support wireless Bluetooth connection? If yes, you will play music through your Bluetooth enabled devices like as smartphone and tablet, or some notebooks, and then your can play lossless format music like as WAV, APE, AALC, FLAC,.etc after you install music player in your Bluetooth enabled devices. As you known, the sound of signal-ended tube amplifier can provide you warm, soft sound quality because its tube characteristics and class A single-ended outputs.
This is a class A tube amplifier with wireless Bluetooth 4.2 technology, its Bluetooth module adopted CSR64215 Bluetooth 4.2 chip which support supports APT-X lossless audio transmission, the transmission speed is faster and better sound quality.
Except wireless Bluetooth signal transmission, it also supports Aux-in at the back. With automatically audio signal switching function , it is able to effectively prevent crosstalk that using relay signal to switch signals, and the original signal aux can remain through state even without the power to the Bluetooth board. The automatic switching function that default is aux audio signals, it automatically switch to Bluetooth mode when Bluetooth signals input; However, when no Bluetooth signal or Bluetooth playback pause automatically, signal transmission switch to aux mode signal.
Wireless Bluetooth Classa Signal-ended Tube Amplifier
Back view of Wireless Bluetooth Classa Signal-ended Tube Amplifier
Lighting of Wireless Bluetooth Classa Signal-ended Tube Amplifier
The tube amplifier adopted vacuum tube 6P1 which is a special audio tube is used to produce a small single-ended Class A tube amplifier with a mellow natural sound, sweet and warm, especially when listening to the vocal performance is very rich, very good acoustic performance, transparent and you will not be tired even listening for a long time. Use it to listen to the human voice, piano, strings, zither, etc., more natural, never tired.
This small single-ended Class A tube amp adopted tube 6n2 as a preamplifier, 6P1 as power stage output, its design is simple and the elegant, suitable for placing in the study, bedroom ..., so relax, and you can truly feel the music mood, listen to the voice of the soul.
