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Tuyen:
http://www.liveacoustics.com.sg/transformer.htm

Permalloy Output Transformer

Permalloy is an alloy of nickel (40% to 80%) and iron that has an exceptionally high magnetic permeability
(B/H). High permeability transformer cores are more sensitive and responsive to low-level audio signals.

Permalloy is more expensive than more commonly used materials, but must be used if the highest quality output transformer is required. Permalloy output transformers typically have better transient response, greater information retrieval and are generally more vivid in their presentation of music." - quote from amplifier designer Herbert Reichert

The material are source from Korea typically 66mm EI laminations. For line/ power output transformer , The 48% Nickel base material are use.

For signal to signal transfer, 78% Nickel EI 48mm lamination are use.

Permalloy SET Power Output transformer


Specifications
 Wide bandwidth, 5Hz to 65KHz  frequency output
 Potted in Aluminium box / wood veneer.

Order Code P2.5KPerm - Pri 2.5K to Sec 600 Ohm
(For 2A3 tubes)
Order Code P3.5KPerm - Pri 2.5K to Sec 600 Ohm
(For 300B tubes)

Price : $400 or (USD$305) a pair.

 Custom  Silver Permalloy Power Output Transformer


Much more refined high frequencies, with music and vocal being more engaging
Meticulously hand-wound, using 7N silver UPOCC mono crystal wire  in the SEC output

Price -  SGD700 or approximately USD500 per pair  (E-mail to enquire).

Tuyen:
Quite well priced and possibly provide better sound over chinese made output transformers (ie. James brand) ?

Looking for a pair of 3.5K SE opt  as part of my Audionote 300B SET KIT amp rebuild :)

Tuyen:
Any thoughts on permalloy output transformers?

zenelectro:

--- Quote from: Tuyen on July 30, 2014, 05:30:54 PM ---Any thoughts on permalloy output transformers?

--- End quote ---

Permalloy = added Nickel, not sure how much in their case.

For low level transformers such as microphone IP and line OP generally up to 80% Nickel is added.
The result is lower low frequency distortion and a cleaner overall presentation.

This may or may not be to your liking, for example many vintage 'clone' transformers such as Neve (mixing desks)
output transformers are preferred in all iron as it adds to the authentic vintage sound.

So in a nutshell it will be subjective.

cheers

Terry

Tuyen:
Thank you Terry.

I will certainly consider a pair of these OPT when time comes.

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