Power Transformers

[Krisfr]

What is a good American based source of power transformers for the DIYer?

both conventional and toroidal

I am looking to build something in the 100 watt per channel and 250 watt both into 8R i.e. +- 50 and +- 60

Thanks

[Geek]

Rip apart a HTiaB from a thrift store and you shall find said iron
(well, the EI stuff anyway)

Cheers!

[ChrisA]

Originally Posted by Krisfr

What is a good American based source of power transformers for the DIYer?

both conventional and toroidal

I am looking to build something in the 100 watt per channel and 250 watt both into 8R i.e. +- 50 and +- 60

Thanks

It depends on the exact specs. There are several companies. Hammond is of course the "standard". But Edcor and Allied make good tranformers too sometime for less and then there are others that make speciality products.

What specs are you looking for and are yu looking for best quality at any price, lowest price, best "value". Do you need international primary of is 120V 60Hz only OK?

[Krisfr]

I want to do the 100 watts per channel as RMS into 8R 150 watts into 4 would be okay.

220V would be okay too, but not as important as good raw power.

I used a Dynaco transformer to power my "Leach amp from Feb 1981 Audio magazine article. (I think that is the right date)hhhhhehe

I hope that does not date me too much.

I will accept anything that is inclined to start me to build SOMETHNG...

So workable and affordable out weigh esoteric nuances such as looks and ultra specs. I also want to combine digital computer and circuitry engineering/knowledge that I have made a living with for more than a few years.

I have not seen any project that strikes my fancy. But I have built a couple of smps in the low current arena, I might go there.... but the cost and or lack of parts are hurdles.

IF I could find an old Dynaco transformer, I would smile for a while.

So I am a looking for SOMETHING

Forgive my rambling

[ChrisA]

Originally Posted by Krisfr

I want to do the 100 watts per channel as RMS into 8R 150 watts into 4 would be okay.

That sounds more like specs for an amp, not for a power transformer. Transformers are rated in volts and milliamps

For example a power transformers might have specs like "700 volts center tapped, 500 milliamps" An transformaer like that could drive at set of eight 6L6 tubes, four per channel for about 100 WPC.

Here is one like that
http://www.edcorusa.com/Products/Sho...ct.aspx?ID=593
and here is another
http://www.parts-express.com/pe/psho...45&ctab=2#Tabs


If you want a solid state 100WPC amps just buy this for $200
http://www.bhphotovideo.com/c/produc...Amplifier.html

[Krisfr]

What I was saying was, for a 100 watt per channel amp, I would need a +- 50 Volt transformer, for a 250 watt per channel amp, I would need a +- 60 Volt transformer, I need them to have good current ability to make it work.....

I am working on a couple of ideas...

Thanks for the links...but I do want to build a Solid State Power Amplifier, something like a Leach

[multisync]

I was going to build a new power amp so I looked around on Ebay and found a Kenwood Km 106 125 watt amp. I bought it and it still sounded pretty good so I kept it as is. Later I did pick up a dead Kenwood km106 for $25. One channel is blown and I am looking around for suitable spare parts or I may gut the whole thing. The transformer, after the rectifiers, in the Kenwood produces +/- 68 volts dc. The power amp at clipping is around 170 watts @ 8 ohms even though it is only rated at 125 watts. There is also a switch inside the amp to lower the voltage if the owner is using 4 ohm speakers. I looked at the schematic and it switches the secondary from 96 ct to 74 ct. The primary is 110/220. Look around the pawn shops or ebay for something similar. A new transformer can be very pricey and shipping can be expensive depending where you live. I have a dead surround sound amp that I may repair one of these days. I bought it new for $150cdn it is rated at 5 x 100. It would probably have a suitable transformer for a 2 x 100 watt @ 8ohm or 2 x 175 watt @ 4 ohms. The brand name was Quest. As power levels go up finding a used transformer will be a bit harder.

[Krisfr]

Yes I think that the use of a transformer from a non-working system would be a great Idea! Save the environment and my wallet too as well as the shipping charges for a hearty clunk. I might get a welcome from the "The Price is Right"