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Old 26th November 2006, 07:02 AM   #11
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Location: Wisconsin....what did you expect?
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Can you post some pictures? (Totally unrelated, I know.)
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Old 26th November 2006, 07:38 AM   #12
Fuling is offline Fuling  Sweden
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Lineup: 2x20V 200VA toroid transformer, each winding feeds a bridge rectifier, a 15000uF 40V cap and a simple capacitance multiplier. If I had just a couple of volts more available Id use CLC-filters before the C-multiplier to get extra quiet PSUs, I use that configuration in another amp and the background is pitch black!

Spasticteapot: Yes, but not today. Im on my way to work now and will be stuck there the next 29 hours or so...
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Old 27th November 2006, 09:21 PM   #13
Fuling is offline Fuling  Sweden
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The PSU:
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Old 27th November 2006, 09:33 PM   #14
lineup is offline lineup  Sweden
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Quote:
Originally posted by Fuling
The PSU:
Very Solid and Good supply!

Some time maybe, I will get myself to buy such good stuff
to my amplifiers.
Sure is what any power amplifier should have - for best results.

Very Nice, Fuling
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Old 27th November 2006, 09:59 PM   #15
Fuling is offline Fuling  Sweden
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Thank you!
Itmostly buy used and surplus parts, thats the only way for me to afford building class A amps all the time!
Since Im mostly into trying out new circuits and having fun I rather build five different amps with cheap components (not everywhere though, I tend to use good caps for example) than one super amp for the same money.

Sometimes when Ive made some prototype that sounds really good I build an improved version with better components later, but most of my projects are quite temporary.

Anyway, I noticed that the caps are assembled in opposite directions, please remind me to turn one of them 180 degrees before I start connecting things

I got the missing parts for my Xsoz today so this project will be put aside for a (short) while, I also forgot to order output connectors so Ill have to wait for them to arrive.
I can probably populate the veroboards within a couple of days but the remaining mechanical work might take longer.
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Old 27th November 2006, 10:57 PM   #16
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I can't wait to hear your impressions on its sound qualities.

John
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Old 7th December 2006, 09:32 PM   #17
Fuling is offline Fuling  Sweden
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Quote:
I can't wait to hear your impressions on its sound qualities.
I had a first listening session with this amp today.
Since my active crossover needs some modifications before it can drive the Baby Zens and my Tangband speakers, I listened to each pair och amps with my FE167E speakers and an input buffer.

Impressions: Both sets of amps sounded quite good, but the HF amps definitely had better highs than the LF amps (big surprise, huh? )
I believe I can thank the cascoded gainstage for this, the treble sounded very clear compared to what came out of the more aggressive bass amps.
This was only a first impression based on one hour (or so) of listening to each pair.
Ill give the amps some time to break in and then report further, meanwhile I will also mod the active XO so I can try the amp out with the speakers its intended to drive.
Conclusion so far: Cascoding is the way to go!!
This is definitely not my last amp with a single cascoded gainstage!
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Old 8th December 2006, 12:17 AM   #18
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Default Ohhhhh....

An amp for different applications in the audio spectrum...

I totally missed that point. Now, you're going to have to give me many more details. For instance, does the bass amp not deliver the highs intentionally (i.e. designed for bass applications only); with the aleph current source connection, it should have more power, correct? How does the cascode treble amp sound doing full spectrum? I want all the juicy detail--all in due time, of course.

My hat's off to you fuling, excellent job in audio exploration!

John

btw: can you rewrite those component values in larger print?
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Old 8th December 2006, 09:07 AM   #19
Fuling is offline Fuling  Sweden
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Yup, both amps works fullrange but they are optimized for different frequency ranges. The cascodes are there to clean up the highs in the HF amps and the Aleph CCSs are meant to deliver extra current to the woofers.
If I had to choose one of the amps for fullrange use it would definitely be the cascoded one with static CCS.

I can post better schematics tomorrow night.
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Old 8th December 2006, 04:31 PM   #20
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Thanks for offering to rewrite the schematics.
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