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Old 5th April 2005, 06:29 PM   #1
Kermit is offline Kermit  Norway
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Default Another VBIGC :)

Just thought I’d share a few pic’s of my latest project. A valve buffered chipamp. The circuit is pretty much like Joe’s/Franz T-network VBICG. Just a few minor changes in order to use some of the stuff I had lying around.
Haven’t had much time to listen, but at first “glance” it sounds very pleasing, but it lacks some “authority” compared to my Aleph.

Front:
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Old 5th April 2005, 06:30 PM   #2
Kermit is offline Kermit  Norway
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Another:
Tubes are Phillips ECG 6922
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Old 5th April 2005, 06:32 PM   #3
Kermit is offline Kermit  Norway
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Inside:
Despite being verry packed (and leads flying al over) theres no hum
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Old 5th April 2005, 06:46 PM   #4
steenoe is offline steenoe  Denmark
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That is a beauty, Kermit Nice job.
Quote:
compared to my Aleph.
A GC is not a match for an Aleph, sorry

Steen.
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Old 5th April 2005, 06:56 PM   #5
GregGC is offline GregGC  Canada
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Default Re: Another VBIGC :)

Quote:
Originally posted by Kermit
Just thought I’d share a few pic’s of my latest project. A valve buffered chipamp. The circuit is pretty much like Joe’s/Franz T-network VBICG. Just a few minor changes in order to use some of the stuff I had lying around.
Haven’t had much time to listen, but at first “glance” it sounds very pleasing, but it lacks some “authority” compared to my Aleph.

Front:
Verry nice !

I bet you have only 1000-1500uf/rail/channel in your PS. Increase it to 4700 and you'll hear totally different sound (personal experience). You'll be pleasantly surprised.

Greg
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Old 5th April 2005, 07:35 PM   #6
Kermit is offline Kermit  Norway
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Quote:
Originally posted by steenoe
That is a beauty, Kermit Nice job.
A GC is not a match for an Aleph, sorry

Steen.
Hehe, I know, it’s an unfair comparison. I would be hugely disappointed if it “out battled” my aleph, considering I spent only a fraction of what I did on the aleph.

Greg, thanks for the suggestion, I will try that, think I have a few caps lying around.
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Old 5th April 2005, 08:34 PM   #7
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Cool Nice amp

Quote:
Originally posted by GregGC
I bet you have only 1000-1500uf/rail/channel in your PS. Increase it to 4700 and you'll hear totally different sound (personal experience). You'll be pleasantly surprised.
Greg
Quote:
Originally posted by Kermit
Greg, thanks for the suggestion, I will try that, think I have a few caps lying around.
Don't forget the snubber.
Then put it against the Aleph again.
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Old 5th April 2005, 10:02 PM   #8
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nice, but the tube holders remind me of Fritz Lang's movie "Metropolis".
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Old 6th April 2005, 01:08 AM   #9
GregGC is offline GregGC  Canada
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Default Re: Nice amp

Quote:
Originally posted by carlosfm




Don't forget the snubber.
Then put it against the Aleph again.

Carlos,

I take the snubbers for granted and I didn't bother mentioning. I think everybody knows about it. Can't go without them.
I would add also the Zobel and the LR paralel network (10Ohm||0.7uH) in ser with the output. Found it a must in my setup.

Greg
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Old 6th April 2005, 06:11 PM   #10
Kermit is offline Kermit  Norway
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I thought about snubbers, I used it in my first GC, and to be honest I couldn’t tell the difference. But that was a different chip and different rectifier diodes. As I already have a bridge with snubbers in my first GC it would be easy to pick it out and give it a try in this one. I’ll add that to the list of things to try.
But first things first, I have to make a case for the remote, right now it just sits inside a plastic bag, not something you like to show of on the coffee table
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