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:
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:
Attachments
steenoe said:That is a beauty, KermitNice 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.
Re: Nice amp
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
carlosfm said:
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
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
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
Very very nice... I wish my VBIGC was so neat 
BTW why are you using 2 tubes?
Cheers
Andrea
PS Changing the PS caps with 2x10000uF (+ snubbers) changed the amp's behaviour drastically. Before the mid-highs were incredible (maybe too forward) but the bas was somehow missing, now the tonal balance has shifted to a more equilibrated (tough less "appealing" for some aspects) one.
BTW why are you using 2 tubes?
Cheers
Andrea
PS Changing the PS caps with 2x10000uF (+ snubbers) changed the amp's behaviour drastically. Before the mid-highs were incredible (maybe too forward) but the bas was somehow missing, now the tonal balance has shifted to a more equilibrated (tough less "appealing" for some aspects) one.
Hi all,
I just stumbled across this thread, as I'm planning to build a vbigc - maybe just the vb-part first, for first tests.
just loud thinking:
would it be useful to parallel two of the valves, i.e. use both triodes in one of the 6922 in parallel, to reduce noise? Or is this complete nonsense?
Anyway, does maybe anyone know a shop in Munich that sells valves for a reasonable price?
I just stumbled across this thread, as I'm planning to build a vbigc - maybe just the vb-part first, for first tests.
just loud thinking:
would it be useful to parallel two of the valves, i.e. use both triodes in one of the 6922 in parallel, to reduce noise? Or is this complete nonsense?
Anyway, does maybe anyone know a shop in Munich that sells valves for a reasonable price?
Pretty little amp, Kermit!
Do you use voltage doubling eg. greinacher circuit for the tubes anode voltage? What voltage for the anode?
Maybe you could ask in www.jogis-roehrenbude.de as some people from Munich are participating there.
Franz
Do you use voltage doubling eg. greinacher circuit for the tubes anode voltage? What voltage for the anode?
Maybe you could ask in www.jogis-roehrenbude.de as some people from Munich are participating there.
Franz
"would it be useful to parallel two of the valves, i.e. use both triodes in one of the 6922 in parallel, to reduce noise? Or is this complete nonsense?!
Noise is not a real issue in this application. A much better use of the second triode is as a simple CCS under the buffer to replace the cathode resistor. This maintains the split rails.
Shoog
Noise is not a real issue in this application. A much better use of the second triode is as a simple CCS under the buffer to replace the cathode resistor. This maintains the split rails.
Shoog
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