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Why no tiny output transformers?
Why no tiny output transformers?
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Old 25th October 2017, 04:20 PM   #1
BJosephs is offline BJosephs  United States
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Default Why no tiny output transformers?

I'm wrapping up my 5W EL84 amp for listening and was thinking about building a little <1W triode se project for my desk at work. I want to keep the build small. For the first time in my life I find myself looking for a tiny output transformer and I'm noticing that there just aren't many below 5W. Is there a physical limitation that makes smaller transformers less ideal? Or maybe I'm looking in the wrong places?
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Old 25th October 2017, 04:27 PM   #2
Kjeldsen is offline Kjeldsen  Denmark
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Have you looked for DIY practice tupe guitar amps? These are usually 0,5 - 2 watt output
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Old 25th October 2017, 04:29 PM   #3
azazello is offline azazello  Bulgaria
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If You need very good sound, You have use big output trafo.....big OT - big sound
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Old 25th October 2017, 04:31 PM   #4
BJosephs is offline BJosephs  United States
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Quote:
Originally Posted by Kjeldsen View Post
Have you looked for DIY practice tupe guitar amps? These are usually 0,5 - 2 watt output
Sure, but would a transformer spec a cheap tube amp have a frequency response appropriate to hifi?
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Old 25th October 2017, 04:42 PM   #5
Kjeldsen is offline Kjeldsen  Denmark
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no idea, but the guys maybe can answer

ClassicTone Output Transformers
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Old 25th October 2017, 04:44 PM   #6
20to20 is offline 20to20  United States
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Quote:
Originally Posted by BJosephs View Post
Or maybe I'm looking in the wrong places?
Hmmmm... Low powered HI-FI... Old battery powered tube portable radios?.. Not HI-FI.. Old tube car radios?... FM.. getting closer but you'll have to do salvage... Tube FM radios... finding those trannies will be a scavenger hunt.
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Old 25th October 2017, 05:25 PM   #7
Jeff Yourison is offline Jeff Yourison  United States
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How small? Hammond 109L PC Mount, 2 Watt, 10K into 3.2 Ohms, under 1.5" x 1" footprint. Also other impedances available . . .
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Old 25th October 2017, 05:52 PM   #8
BJosephs is offline BJosephs  United States
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Well those are interesting. They won’t work for SE (I presume the imbalance specs are in units of mA) but maybe I could do an ECC99 push pull. Thanks.
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Old 25th October 2017, 06:00 PM   #9
audiowize is offline audiowize  United States
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How about this one?
http://www.classictone.net/40-18106.pdf
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Old 25th October 2017, 06:09 PM   #10
artosalo is offline artosalo  Finland
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Hammond 125ASE
Hammond Mfg. - Universal - Single Ended - Tube Output Transformers - (125 Series)
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