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Old 26th January 2006, 03:02 PM   #1
gja is offline gja  Spain
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Default cheap se output transformers

Hi,
Any opinion about these transformers:http://www.edcorusa.com/classx/tube_...xse15-8-5K.htm
I am looking for the cheapest output transformers and these looked quite good.
Itīs for a first time project and am like others,donīt want to spend fortunes for a first try.
Thank you
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Old 26th January 2006, 03:37 PM   #2
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Default Re: cheap se output transformers

Quote:
Originally posted by gja
I am looking for the cheapest output transformers and these looked quite good.
I can't imagine them NOT being good value for $17.52. The only thing I know of that are cheaper are these:
http://triodeelectronics.com/tfchxfwi48oh.html
but they are only 100Hz-20kHz and 5W. At that price you would even have to look hard on eBay to find a cheap vintage transformer pulled out of a console that costs less.
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Old 26th January 2006, 04:50 PM   #3
Cassiel is offline Cassiel  Libya
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http://www.autocostruire.com/catalog...6e15984ef65af2


10 euros!!!!
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Old 26th January 2006, 05:21 PM   #4
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Wow. That's really cheap. Any idea what the maximum DC current is?
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Old 26th January 2006, 05:22 PM   #5
kevinkr is offline kevinkr  United States
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The Galaxy boxes on that site look pretty good too.. Not sure about that output transformer, no specs.. LOL

Ciao...
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Old 26th January 2006, 06:10 PM   #6
Zoran is offline Zoran  Serbia
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The transformers are not good for the proper tube single ended
design...
datas, like usual common rule, are without crutial units of the device,
like
primary inductance
capacitances, leakage inductances
wire diameters
gap lenght...
we have only, like in most cases, impedance ratios
that means nothing
(but most designers do not write those values at schematic diagrams,
why should manufacturers do so ?..)
Anyway the transformer and simillar models can be
with great succes implemented in guitar amplifiers and old tube radios...
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Old 26th January 2006, 06:36 PM   #7
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Quote:
Originally posted by Zoran
The transformers are not good for the proper tube single ended design...
I agree but disagree in this context. You are right that an SE amp built with these will unlikely be mistaken for something built using Plitrons, Lundahl, etc. However, the original post clearly stated this was about building a first tube amp and trying to keep budget down. In that context I believe these transformers are an excellent choice.
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Old 26th January 2006, 07:37 PM   #8
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I can't speak for the Edcor transformers, since I had never heard of them until now. I will order a pair and subject them to my usual torture testing.

I have tested the Triode Electronics units that were mentioned. I was amazed that some decent sound could come out of such a tiny transformer. The Triode unit is specced for 40 mA max, I had no problems running 60 mA with a 300B. The sound was clean and I did not notice any transformer saturation with real music playing through speakers at about 3 watt peaks. It helps that my speakers have an impedance bump at the frequency that saturation should start (70Hz). Many of the listeners could not always tell which had better sound, the Triode unit or a Hammond 125CSE. It was easy to pick out the One Electrons though.

The Edcor units are twice as big for only a few dollars more. I hope they work twice as good.
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Old 26th January 2006, 08:15 PM   #9
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Hmmm...I'm thinking the 60 watt 6600/4 ohm PP transformers from Edcor might work well for an 845 PP into 8 ohm speakers???????
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Old 26th January 2006, 08:30 PM   #10
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I don't know if the PP transformers can take the voltage of the 845. I don't know where you intend to operate them.

I just ordered a pair of the cheap ones (XSE15-8-5K). The sales girl said their transformers were not stocked, and are built to order. She said that mine would go out next week. I will subject them to listening tests and frequency response tests with a few different tubes when I get them. I will report the results here. If I like them, then I may try some of their other transformers.

They have some line to voice coil, and amplifier to line transformers made for sound distribution with acceptable frequency response that are reasonably priced. I am thinking PSE 6336's or PPPSE 6AS7's ( I don't have any 6C33) driving a 140 volt to 8 ohm transformer.
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