[Bob_McBob]

So, Plitron 037017201 -- 80VA, 30V+30V, 1.33A.

I'm curious, is there any benefit or reason for choosing a transformer with higher specs like the Veda Audio-installed one?

 

[dip16amp]

A larger transformer can handle higher temperatures. Less chance of failure if it is cooler.

If you change from a 34VAC transformer to a 30VAC one, then you should also change the output voltage of the LM338 regulators to equalize the voltage drops between them and the OPA541 opamps.

Do you have any pictures of your transformer? Maybe someone will recognize it and you can avoid buying the same one or brand.

 

[Bob_McBob]

So I heard back from Plitron, and their transformers are rather expensive! Is there anywhere else I should be asking for prices? The higher-rated model is almost $90, which is more than I am willing to pay to eliminate the buzzing. However, I don't want to pay less and find out it's just as bad...

Advice please!

 

[amb]

I used a toroid from Richard Sumner Technology for my Dynahi build. Great service, fast turnaround time, and good price too. At first I tried to get a quote from Plitron, by the time I got a response from them the Sumner transformer had already arrived.

Another well-respected source for toroidal power transformers is Avel-Lindberg.

 

[dsavitsk]

Quote:

Originally Posted by amb Another well-respected source for toroidal power transformers is Avel-Lindberg.

http://www.partsexpress.com/pe/showd...number=122-630

 

[Bob_McBob]

Thanks, I sent them an e-mail. SFT tells me "32~34V , 1A~2A transformer is fine", so I forwarded that information to them along with the original transformer specs. I suppose it can't hurt to pay a few extra dollars for a higher rated transformer, especially for a Dynahi. Can you tell me how much you paid for your transformer?

Plitron definitely took a while to reply, I e-mailed them several days ago!

 

[amb]

Quote:

Originally Posted by Bob_McBob Can you tell me how much you paid for your transformer?

My Richard Sumner toroid (80VA, single 117V 60Hz primary, dual 35V secondaries) was $34 each not incl. shipping.

 

[Bob_McBob]

This is a bit of a bizarre question, but here goes...

In a quiet room, with the lid of your Dynahi open, and your ear close to the transformer, do you hear anything? If yes, how far away do you have to be before it's silent? I have heard conflicting opinions about just how "silent" toroidal transformers actually are, and unfortunately I don't have anything else to compare this one with.

Bizarre question finished.

 

[amb]

Quote:

Originally Posted by Bob_McBob In a quiet room, with the lid of your Dynahi open, and your ear close to the transformer, do you hear anything? If yes, how far away do you have to be before it's silent? I have heard conflicting opinions about just how "silent" toroidal transformers actually are, and unfortunately I don't have anything else to compare this one with.

It's not unusual to have a slight amount of mechanical buzz, but on mine it's inaudible just a couple of feet away.