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26th October 2010, 07:24 AM
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#1 |
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diyAudio Member
Join Date: Dec 2009
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DIY 50C5 mini amp...
Hello all,
Just wanted to share my newest project... It's tubes are as follows: 35w4 12AT7 12AT7 50c5 It's built into a 6" x 4" x 1" enclosure, quite small... Sounds amazing, very bluesy, even with a crap 1970s 8" that I dumpster dived for a few weeks ago...ever so slight of a hum, barely noticeable, All tubes are pulled out of 2 1950s radios, Total Cost: $35 Tell me what you think... |
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26th October 2010, 08:10 AM
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#2 |
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diyAudio Member
Join Date: Mar 2007
Location: Auckland, NZ
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weally qute!
__________________
"Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report |
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28th October 2010, 07:33 PM
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#4 |
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diyAudio Member
Join Date: Dec 2009
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Well, just to update...
I left it on for 12 hours to make sure that nothing melted and everything is A OK. I'm about to start working on another design that uses the popular 50L6GT and the 12AX7 (Although I may substitute 2 12AT6 instead) Took it to the pawnshop and they gave me $100, not bad for a $35 investment... 
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28th October 2010, 07:45 PM
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#5 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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I think you should rotate the output transformer so magnetic fields of power and output transformers would be perpendicular, it minimizes hum.
__________________
If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative. |
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28th October 2010, 08:18 PM
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#6 |
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diyAudio Member
Join Date: Feb 2009
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and add a fuse...
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28th October 2010, 08:18 PM
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#7 |
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diyAudio Member
Join Date: Feb 2009
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And ground the chassis...
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28th October 2010, 09:55 PM
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#8 |
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diyAudio Member
Join Date: Dec 2009
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Yes, I know that I need to add a fuse, maybe 1 Amp? The chassis is grounded to the negative lead of the capacitor, and all the other grounds ground there too...
It doesn't have a bad hum at all, but next time I will run the output transformer perpendicular. This is my first amp, so any feedback will be more than welcome. One thing that I didn't count on was the heat generated by these tubes. Now I understand why you can't just pack all of them onto a small chassis. Live and learn I guess. |
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28th October 2010, 09:58 PM
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#10 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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Wow, congratulations!
Quite good job for the first amp!
__________________
If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative. |
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