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Oct 18, 2025 | 0 comments

The Secret Weapon: Why the Output Transformer Matters in ...

Published by IWISTAO For the true audiophile, tube headphone amplifiers represent the pinnacle of musical intimacy — a world of warmth, depth, and harmonic beauty. Yet beneath those glowing glass...

Sep 19, 2025 | 0 comments

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.

What is B, P, G for tube amplifier output transformer?

Jun 24, 2018 | 0 comments

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 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。
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）

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