The Ultimate Upgrade? Exploring Amorphous C-Core Output Transformers for the 300B Tube Amp
The Ultimate Upgrade? Exploring Amorphous C-Core Output T...

A 300B tube in a classic SE Class A circuit constantly draws a significant amount of DC current through the primary winding of the output transformer (typically around 60mA). This DC current can easily saturate a standard transformer core, causing massive distortion and a collapse of inductance. To prevent this, SE output transformers must have a small air gap in their magnetic path.

This is where amorphous C-cores shine. They possess a high saturation flux density, meaning they can handle a strong magnetic field before saturating. This property, combined with their low loss, allows designers to create a gapped transformer that maintains high inductance even with the DC bias, a key factor for achieving deep and authoritative bass.

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Building a 6SL7-Driven EL34 Single-Ended Amplifier: A Deep Dive into Classic Tube Tone
Building a 6SL7-Driven EL34 Single-Ended Amplifier: A Dee...

This article explores the design of a classic SE amplifier, pairing two legendary tubes: the 6SL7 high-mu twin triode as the driver and the iconic EL34 power pentode for the output stage. This combination promises a journey into the heart of vintage audio, delivering a sound that is both powerful and nuanced.

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A DIY Guide: Building a Power Transformer for an EL34B Push-Pull Tube Amplifier
A DIY Guide: Building a Power Transformer for an EL34B Pu...

This article provides a comprehensive, step-by-step guide for the advanced DIY audio enthusiast on the intricate process of designing, calculating, and constructing a power transformer from scratch. We will embark on a journey from theoretical principles to hands-on craftsmanship, culminating in a custom-built transformer tailored for a classic stereo EL34B push-pull amplifier. This is not a project for the faint of heart, but for those willing to invest the time and diligence, the rewards are immeasurable.

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What is B, P, G for tube amplifier output transformer?
真空管アンプ出力トランスのB、P、Gとは?

真空管アンプの出力トランスの一次側には、一般に 2 つ、3 つ、および 5 つの接続端子があります。

単管式クラスAアンプの回路には、次のものが含まれます。

  1. 1 次側は 2 つの接続端子で、P はスクリーンに接続され、B は B+ (つまり、DC 高電圧電源) に接続されます。
  2. 1 次側は 3 つの接続端子で、P はスクリーンに接続され、G はウルトラリニアタップ (6P6P、6P1、6P14 などの電力増幅管の 2 番目のゲートに接続されます)、B は B+ (つまり直流高圧電源)

IWISTAO 真空管出力トランス

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