The song Angel from 6F3 drive 300B Vacuum Tube Amplifier

Vacuum tube 300B is a mysterious vacuum tube with a long history, and don’t know how many music fans are fascinated. I still don’t know how many people are struggling to find its real voice. The audiophiles think that 300B is a female voice representative. But our 300B kit circuit is the embodiment of the sound of rigidity and softness. It is not only an attentive and charming woman, but also an iron and tender prince charming.

There are also rumors that the low frequency of 300B is not good. From an electrical point of view, the internal resistance of 300B is only about 800 ohms, which shows its damping coefficient is very good. Why is the rumors so? This is depended on the quality of the power supply, time constant of the circuit design and other reasons.

 

In fact, 300B tube is the best way to reflect the original atmosphere of music, because the tube’s characteristic curve distribution is excellent, coupled with second-harmonic sense of hearing, the mouth shape of the singer, the low-frequency tension of the chest resonance, its dynamics can be said to reach the perfect state, if regardless of the power, hundreds of thousands of transistor world-famous machines are difficult to surpass in the same power range as the 300B. From the acoustic point of view, the sound of the 300B tube amplifier is more expressive and richer, musical sense.

 

Our vacuum tube 300B kit has a unique acoustic and electrical regulatory concepts from the design to the selection of the output transformer.

The vacuum tube 6F3 is a relatively unpopular composite tube, which is quite a 12ax7+6p14 inside. Because of the large inventory, the price is related low, but its performance is extremely excellent, especially when it is connected as triode tube, which output internal resistance is particularly low, and linearity is good, driving 300B is absolutely no problem. In addition, many senior enthusiasts will inevitably ask, why use large loop feedback? This is our consideration of sound and stability. The large loop will sacrifice the transparency of mid and high frequencies. However, in order to improve the weakness of the low frequency of the tube, adopt the large loop can will make the internal resistance of the 300B tube amplifier lower, so that its overall sound balanced.

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Finished Vacuum Tube Amplifier:

IWISTAO Single-ended Tube Amplifier Tube Amplifier Mono-block Integrated West Electric Master 2x8W Vacuum Tube 6F3 Drive 300B 5Z2P Rectifier

DIY Vacuum Tube Amplifier Kits:

Vacuum Tube Amplifier 300B Kit Single-ended Class A No soldering 6F3 Preamplifier DIY Kits HIFI

What is an O core transformer?

An O core transformer is a type of toroidal transformer that has a circular cross section and no sharp corners. It is different from a regular toroidal transformer, which has a square or rectangular cross section. The advantage of an O core transformer is that it has less flux leakage and less copper loss than a regular toroidal transformer, because it has a shorter mean length of turn (MLT) and less insulation material. An O core transformer also has the same electrical benefits as a regular toroidal transformer, such as low noise, low stray field, high efficiency and compact size.

An O core transformer is made from grain oriented silicon steel, which has high permeability and low core loss. The steel strip is continuously pointed towards each end to produce a circular cross section. The transformer core is then wound with primary and secondary coils over the core. The winding process is similar to that of a regular toroidal transformer, but it requires more precision and skill.

O core transformers are suitable for applications that require a low profile and a high power rating. They can be used for power supplies, audio amplifiers, medical equipment, lighting systems and other devices that need reliable and efficient power conversion.

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IWISTAO 150W O Type Transformer 4N OFC Dual 18V or 22V 15-0-15V for DAC Preamp Headphone Amplifier

DIY Your Car Subwoofer with IWISTAO Empty Subwoofer Cabinet

DIY Your Car Subwoofer with IWISTAO Empty Subwoofer Cabinet 

Do you find yourself disappointed with the lackluster audio quality in your car? Want to experience the full power of your music while you're driving? Look no further than a car subwoofer!

A car subwoofer is an essential component of any high-quality car audio system. It is designed to reproduce low-frequency sounds like bass and drums, which can often be lost in a car's interior acoustics without proper equipment. With a subwoofer, you can bring your music to life and truly feel the beat of your favorite songs.

Installing a car subwoofer is a straightforward process that can be done in just a few steps. You can choose to have it professionally installed, or you can do it yourself with some basic knowledge of car audio systems. Once installed, you'll immediately notice a difference in the audio quality of your car. The bass will be deeper, more pronounced, and more satisfying.

Whether you're a music enthusiast or just someone looking to upgrade your car's audio system, a car subwoofer is definitely worth the investment. You'll be amazed at the difference it can make in the quality of your music and your overall driving experience. Don't settle for lackluster audio any longer. Upgrade to a car subwoofer and take your music to the next level!

For those who enjoy DIY projects, you can purchase a passive subwoofer empty speaker cabinet and fix your favorite bass unit into the cabinet. The board of this woofer is made of high-density board with a honeycomb structure, effectively eliminating standing sound. The outer surface of the speaker is pasted with black PVC leather, and the front panel is made of three-layer HDF boards. Enjoy the fun of customizing your car audio system to your preferences!

There are two types for the empty cabinet, one is inverted hole on the side, and the other is sealed one.

Inverted hole on the side

Or 

Front Inverted Holes

Sealed Empty Cabinet

After fixed the driver

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IWISTAO HIFI 8 / 10 /12 Inch Passive Subwoofer Empty Cabinet Honeycomb HDF Board Enclosure Sealed Box Car Audio DIY

IWISTAO HIFI 8 / 10 /12 Inch Passive Subwoofer Empty Cabinet Honeycomb HDF Board Enclosure Sealed Box Car Audio DIY

What is a pull-push output transformer?

What is a pull-push output transformer?

Output transformers are a crucial component of many electronic devices, particularly in audio equipment. An output transformer's role is to match the load impedance, such as a loudspeaker, to the amplifier output impedance. Different types of output transformers have their own advantages and disadvantages. In this article, we will focus on pull-push output transformers.

A pull-push output transformer is a type of transformer used in push-pull amplifiers. In a push-pull amplifier, two transistors or vacuum tubes are used, each handling half of the signal. The pull-push output transformer is designed to combine the signal from both halves of the amplifier into a single output.

The term "pull-push" refers to the way the output transformer is wired. In a pull-push output transformer, the two halves of the transformer are wired in opposite directions. One half of the transformer "pulls" the current, while the other "pushes" the current. This cancels out any magnetic fields generated by the current flowing through the transformer, resulting in a cleaner output signal.

One of the primary advantages of a pull-push output transformer is that it can handle higher power levels than other types of output transformers. The push-pull configuration allows the use of two output devices, each handling only half of the signal. This reduces the amount of power each device needs to handle, allowing for higher power output without the risk of damaging the output devices.

Another advantage of pull-push output transformers is that they can provide a balanced output. A balanced output is important in audio applications because it helps to reduce the amount of noise and interference in the signal. By using a pull-push output transformer, the signal is split into two equal parts, with each half being inverted from the other. This creates a balanced signal that is less susceptible to noise and interference.

In addition to these advantages, pull-push output transformers are also relatively easy to design and build. They can be constructed using standard transformer winding techniques, and there are many commercially available options for those who don't want to build their own.

However, there are also some disadvantages to using pull-push output transformers. One of the main drawbacks is that they can be more expensive than other types of output transformers. This is because they require more winding wire and more complex winding techniques.

Another potential disadvantage of pull-push output transformers is that they can be more challenging to tune. The balanced output requires precise matching of the two halves of the transformer, which can be challenging to achieve.

In conclusion, pull-push output transformers are a popular choice for high-power audio amplifiers due to their ability to handle high power levels and provide a balanced output. Although they may be more expensive and challenging to design and tune than other types of output transformers, their advantages make them a popular choice for many audio enthusiasts and professionals.

Now, some people asked us what is P1, G1, B+, P2, and G2 of a pull-push output transformer?

The terms P1, G1, B+, P2, and G2 are commonly used to describe the winding connections of a push-pull output transformer in a vacuum tube amplifier. These connections are similar to those used in a pull-push output transformer, but the naming convention is slightly different. Here is a brief explanation of what each term means in a vacuum tube push-pull output transformer:

P1 and P2: These are the primary windings of the transformer. P1 is connected to the plate of one vacuum tube, while P2 is connected to the plate of the other tube. The primary windings are where the amplified signal is applied.

G1 and G2: These are the center-tap connections of the primary windings. They are used to provide a balanced output signal. G1 and G2 are usually connected to ground in the amplifier circuit.

B+: This is the high-voltage power supply connection of the transformer. It is where the high voltage DC power supply is connected to power the vacuum tubes.

There are some examples as below, in order to understanding well. This diagram is for 2x25W pull-push vacuum tube amplifier, and for EL84, 6P1 tubes.

2X25W EL34 pull-push vacuum tube amplifier

EL84 pull-push vacuum tube amplifier

6P1 pull-push vacuum tube amplifier

Audio Note EL84 Pull Push Tube Amplifier

4.5 Inches Labyrinth Speaker Solid Wood Cabinet with Bose Model 100 PR Unit

4.5 Inches Labyrinth Speaker Solid Wood Cabinet with Bose Model 100 PR Unit

The Bose Model 100 PR was a highly sought-after speaker in the last century and many of them are still in good condition today. We have repurposed these units and integrated them into our custom-designed labyrinth speaker cabinet.

We have demonstrated the performance of these speakers in a video. Additionally, we offer empty 4.5-inch speaker cabinets for sale. You can purchase the Bose Model 100 PR units locally and install them in the cabinets with the pre-cut panels we provide.

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IWISTAO HIFI Speaker Empty Cabinet 4.5 Inches 1 Pair Labyrinth Structure with Solid Wood for Bose Model 100 PR Unit DIY