Need to convert a Linar preamp from 220V to 120V

rastanearian · 27th February 2011, 09:26 AM

I have just acquired a Linar model 2 preamplifier that is configured for 220V.
I can see that it is using a dual primary toroid, but I am not 100% certain about how to go about reconfiguring it for 120V.
It looks like the primaries are wired in parallel.
I have attached a couple of pics to illustrate my situation.
The white and orange are connected to the hot and the black and brown are connected to the neutral.
Any help is appreciated. I will call Linar as soon as I can to confirm, however it is my impatience that is creating this post.

poynton · 27th February 2011, 10:19 AM

Is this how you received it ?

It looks like it is already set for 110v as both primaries are paralleled.

It's dangerous as it stands. The bare wires need insulating.

Andy

.

rastanearian · 27th February 2011, 04:10 PM

The bared wire is my doing, for the picture.
They were taped up. I will be replacing the tape with heat shrink.
I think you are right about the conversion already being done.
I have no way of contacting the previous owner to be sure.
My understanding is that the primaries are paralleled for 110V and in series for 220V.
I know I need to brush up on power supplies, I've been lazy.

27th February 2011, 10:19 AM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Is this how you received it ? It looks like it is already set for 110v as both primaries are paralleled. It's dangerous as it stands. The bare wires need insulating. Andy . __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

27th February 2011, 04:10 PM	#3
rastanearian diyAudio Member Join Date: May 2009 Location: British Columbia	The bared wire is my doing, for the picture. They were taped up. I will be replacing the tape with heat shrink. I think you are right about the conversion already being done. I have no way of contacting the previous owner to be sure. My understanding is that the primaries are paralleled for 110V and in series for 220V. I know I need to brush up on power supplies, I've been lazy. __________________ If you make people think they're thinking, they'll love you; But if you really make them think, they'll hate you. Don Marquis

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