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Old 1st December 2012, 09:50 PM   #1
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Default Altec 15067 transformers

I have two of these Altec 15067 transformers that have been sitting on my parts shelf for a while. They are intended for 70v applications. I googled them and saw someone had the same ones listed on E-Bay as tube output transformers for 2A3 tubes, 2500 ohm primary and 4, 8 and 16 ohm secondary. It didn't say anything about them being modified for separate primary and secondaries. I checked all four wires coming out and there is continuity on all wires. I have heard of using 70v transformers as output trans. but they had primary and secondary sections. Being a new DIY'er I've never opened up a transformer before. How possible is it to modify these to be SE transformers and is it worth it? I've attached a picture of my transformers.

Tom
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Old 2nd December 2012, 01:08 PM   #2
tomlang is offline tomlang  United States
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First off, this transformer does not have a gapped core so it will not work for SE duty.

I have become interested in using line transformers as output transformers and made a spreadsheet for several that are available here in the USA. I don't have the 15067 data, but I have attached data for the 15066. As you can see it is far from 2500 ohms as it is a 600 ohm p-p transformer with an 8 ohm load on the 8 ohm tap. If you put a 32 ohm load on the 8 ohm tap you would have 2400 ohms reflected back to the primary.

For more information:

http://home.alphalink.com.au/~cambie/6AN8amp/M1115.htm

Cheap Output Transformers

Parsimon: An Ultra-Cheap DIY Class AB PP Pentode Power Amp - AudioKarma.org Home Audio Stereo Discussion Forums
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