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Toroidal transformer on tube amp

Why are toroids so popular in solid-state amplifiers but so uncommon in tube amplifiers?
They are said to send less EMI and interference to nearby components, among other benefits.

Is there a reason why solid-state designs are "so good" but tube amplifiers aren't?
Why not use them as output transformers?


I've never used EI transformers and have always relied on toroidals.
But, in any case, I've never built a tube amplifier.

128x128runnaway
teo_audio
2,197 posts
 

R-Core can be an excellent design choice for power supplies in various tube gear.

dafox
38 posts
 

How does Balaced Audio Technology get away with using them on their tube amps?

bdp24's avatar
bdp24
9,868 posts
 

Roger Modjeski (Music Reference, RAM Tubes) brought up the topic of the employment of toroidal transformers in tube amps in one of his Burning Amp Festival amplifier design seminars, and was adamant in his opposition. Tim de Paravicini (EAR-Yoshino) felt the same. Perhaps Ralph Karsten (Atma-Sphere) will comment.

deludedaudiophile
493 posts
 

@dafox 

From BAT’s website for one model:

VK-90t also means there are no tubes to bias; no fuses to replace; no pentodes imitating triodes; and no direct current at the tube output stage. VK-90t is the sound of the future—and musical truth.

I don’t know if the no-DC is a feature of the circuit, or if they have a circuit that adjusts to prevent DC? I am sure there are some tube hacks that can weigh in.

 

alucard19
363 posts
 

Primaluna uses toroidal transformers in their integrated amps and power amps, just check their website.

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