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Old 21st December 2012, 06:56 PM   #1491
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Default Upgrade PCBs for my Aleph J

here it comes...
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Old 26th December 2012, 03:55 PM   #1492
sureshm is offline sureshm  Australia
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Here are pics of my F5 build. Pretty standard parts, nothing exotic. It is more than 2 years in the making, mainly due to not having any time to put it all together. In that time the F5T has been released, oh well may be I will have to build another.....
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Old 26th December 2012, 04:00 PM   #1493
6L6 is offline 6L6  United States
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Fantastic! Clean, organized, unassuming, almost stealthy... I love it!!!

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Old 26th December 2012, 04:16 PM   #1494
bcmbob is offline bcmbob  United States
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Please excuse my nubee knowledge level, but why are some power transistor positions not populated. That implies a lot more flexibility for this type of amp than I had suspected. Would be glad to read about the subject if someone points in the right direction.
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Last edited by bcmbob; 26th December 2012 at 04:18 PM.
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Old 26th December 2012, 04:19 PM   #1495
labjr is offline labjr  United States
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Quote:
Originally Posted by bcmbob View Post
Please excuse my nubee knowledge level, but why are some power transistor positions not populated. That implies a lot more flexibility for this type of amp than I had suspected. Would be glad to read about the subject if someone points in the right direction.
It's a dual purpose board.
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Old 26th December 2012, 04:22 PM   #1496
bcmbob is offline bcmbob  United States
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Dual purpose meaning...........? That's a pretty broad phrase. Could you give some more detail.
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Last edited by bcmbob; 26th December 2012 at 04:37 PM.
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Old 26th December 2012, 04:38 PM   #1497
sureshm is offline sureshm  Australia
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Thanks 6L6!

bcmbob, I used cviller's boards which had the option of a few configurations. You can read about it in his blog. I believe the F5c boards available through the diyaudio store are similar.

http://www.diyaudio.com/forums/blogs...version-2.html

I could have got close to F5T by using the extra output devices, adding diodes across the source resistors and upping the transformer secondary. But getting the standard version going took long enough and with 8 ohm speakers didn't think it was necessary.
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Old 26th December 2012, 04:44 PM   #1498
bcmbob is offline bcmbob  United States
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sureshm, that's what I was after. I'll read that thread. I'm half way through a kit partially based on the F5 and didn't know if it was a universal option to use fewer transistors.

Thanks !
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Old 26th December 2012, 05:14 PM   #1499
6L6 is offline 6L6  United States
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Bob - do you have the F5c board of the standard F5? They are 2 different units and on different pages at the store...
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Old 26th December 2012, 05:20 PM   #1500
bcmbob is offline bcmbob  United States
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No, This is the one I showed you a few weeks ago. It is not a pure F5 amp but uses some of the the design elements. Had I known more at the time I would have bought something from the DIY store. JFET BJT Cascode....
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Last edited by bcmbob; 26th December 2012 at 05:28 PM.
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