• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

My_Ref Fremen Edition GB (9th run - v1.7 boards)

Status
Not open for further replies.
Jump to Latest
#25
Hi Dario,
I try to find the best toroids for this project. I have 4ohm speakers.
I initially wanted to use 2 x 25v 225VA toroids but came across this suggestion:

160VA min, dual secondaries 24-25V (8 Ohm) or 21-22V (4 Ohm)

Would it be possible to still use 2 x 25v with some modifications?
And also should I look for better power rating e.g. 300-400VA?

Thanks
 
#26
archidea1 said:
I try to find the best toroids for this project. I have 4ohm speakers.(...)
Would it be possible to still use 2 x 25v with some modifications?
And also should I look for better power rating e.g. 300-400VA?
Click to expand...

Since you live in Europe I would suggest you to buy Selectronic's R-Core transformers:

Transformateur R-core 120VA - 2 x 21V - R-CORE pour châssis

They're the best you can buy, IMHO.

Regarding the secondaries' voltage... I don't know details (I didn't design the original My_Ref) but from what I remember if 24/25V secondaries are used with 4 Ohm speakers there is some risk when using maximum volume but I don't know if it's only the Spike Protection triggering or a risk of burning the amp for excessive current.

The Transformer I've linked is with 2x21 secondaries, it's an excellent one and will avoid any problem.

If you, instead, want to buy a toroid previous builders reported better results with higher VA rating up to 300VA per channel.
 
Last edited:
#27
ClaveFremen said:
Since you live in Europe I would suggest you to buy Selectronic's R-Core transformers:

Transformateur R-core 120VA - 2 x 21V - R-CORE pour châssis

They're the best you can buy, IMHO.

Regarding the secondaries' voltage... I don't know details (I didn't design the original My_Ref) but from what I remember if 24/25V secondaries are used with 4 Ohm speakers there is some risk when using maximum volume but I don't know if it's only the Spike Protection triggering or a risk of burning the amp for excessive current.

The Transformer I've linked is with 2x21 secondaries, it's an excellent one and will avoid any problem.

If you, instead, want to buy a toroid previous builders reported better results with higher VA rating up to 300VA per channel.
Click to expand...

Maybe this information should go in your excellent build guide?

BK
 
Status
Not open for further replies.
Top Bottom