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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!
__________________
Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012 |
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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.
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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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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!
__________________
The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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