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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.

Jun 24, 2018 | 0 comments

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

The primary of tube amplifier output transformer generally has two, three and five connection terminals.

The circuits of single tube type class A amplifier Among them include:

The primary is 2 connection terminals, P is connected to the screen, B is connected to B+ (that is, DC high voltage power supply)
The primary is 3 connection terminals, P is connected to the screen, G is a Ultra-linear tap (connected to the second gate of the power amplified tube such as 6P6P, 6P1, 6P14, etc.), B is connected to B+ (that is, DC high-voltage power supply)

IWISTAO tube output transformer