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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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28th Aug 2017, 12:37 pm | #1 |
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
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The UX-171 iPod amplifier.
A while back I came across some interesting 1927 vintage transformers on ebay which inspired me, so I got the idea to make an amplifier from 1927 vintage parts that would act as an active speaker for an iPod. The hope was if possible it would not contain a single resistor, just valves, transformers and perhaps a capacitor or two.
Along the way I came across some very interesting information on how to calculate the ideal plate to plate resistance for push pull amps from the good folks at MIT. In class A and AB push pull, one tube alters the operating conditions of the other, but not so much in class B. Anyway I thought I would post the story about this home brew amplifier here, for those interested in 1927 era amplifier technology: http://worldphaco.com/uploads/UX-171...amplifier..pdf |
28th Aug 2017, 1:21 pm | #2 |
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Re: The UX-171 iPod amplifier.
Brilliant, a totally daft project (I like those) with a lovely result, super write up too.
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29th Aug 2017, 12:36 am | #3 |
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Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
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Re: The UX-171 iPod amplifier.
HHmmm what can I say ??
Absolutely beautiful work!!! absolutely beautiful. Just off hand, Why does it appear that the eccentrics live in Queensland ? Watch my posts re: The Golden ear laboratory amplifier. my very best wishes Joe |
29th Aug 2017, 6:46 am | #4 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
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Re: The UX-171 iPod amplifier.
That is beautiful, a work of art. You've put a lot of thought and work into it, I'm impressed.
Andy.
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29th Aug 2017, 2:19 pm | #5 |
Heptode
Join Date: Dec 2014
Location: Lincoln, Lincolnshire, UK.
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Re: The UX-171 iPod amplifier.
I love this
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30th Aug 2017, 6:41 am | #6 |
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: The UX-171 iPod amplifier.
Thank you all for those kind words.
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30th Aug 2017, 7:19 am | #7 |
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Re: The UX-171 iPod amplifier.
I like it!
Pure fun, but now you've got to load the iPod up with the right tracks to hear through such a thing. I'd suggest 'Making wicky-wacky down in waikiki' for a start. David
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30th Aug 2017, 8:26 am | #8 |
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: The UX-171 iPod amplifier.
I was thinking maybe Clara Rockmore's lost Theremin recordings which were found in Bob Moog's basement.
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30th Aug 2017, 12:29 pm | #9 |
Dekatron
Join Date: Nov 2006
Location: London, UK.
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Re: The UX-171 iPod amplifier.
Beautiful concept and build and wonderful write-up! Congrats and also thank you for contributing this journey to the forum !
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Al |
30th Aug 2017, 10:26 pm | #10 |
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Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
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Re: The UX-171 iPod amplifier.
Perhaps some Delia Derbyshire?
Joe |