Gainclone amps (BD-Design)

by GC, Saturday, March 12, 2005, 20:45 (4698 days ago)

Hi,

Has anyone experimented with a low power single chip SS amp (perhaps even battery supplied), just looking around and there are some simple low cost DIY amps around. Any good?

Cheers,
Brian

PS 4mv of hum from my WAD KAT88 amp through the oris gives a nice solid foundation to the music :^(

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Gainclone amps

by GC, Saturday, March 12, 2005, 23:32 (4698 days ago) @ GC

http://www.diyaudio.com/forums/showthread.php?postid=594393#post594393

&

My amp is Joe Rasmussen's JLTi (mark 1). http://members.ozemail.com.au/~joeras/ . It's a tube-buffered chip-amp. I've heard it against 47 Labs Shigaraki amplifier and against (though shortly) Bert Doppenberg's 300B amp. To me, the Shigaraki and JLTi sound virtually the same. The 300B has a slightly different character but the sonics are at the same quality standard. I've also heard some well implemented gainclones (using compact PCB's); and I must say: they are getting closer and closer to the original. There are also some plans of tube-buffering on DIYaudio (provided by Joe). On the other hand, making a nice chipamp is easy. Making a great chipamp is hard. That's why the use of PCB's is a smart move as well as tube buffering (but that's complex to build).

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Gainclone amps

by GC, Thursday, March 24, 2005, 00:34 (4687 days ago) @ GC

http://www.diyaudio.com/forums/showthread.php?postid=594393#post594393

My amp is Joe Rasmussen's JLTi (mark 1).
http://members.ozemail.com.au/~joeras/ . It's a tube-buffered chip-amp.
I've heard it against 47 Labs Shigaraki amplifier and against (though
shortly) Bert Doppenberg's 300B amp.

Niels,

Thanks for putting me on to this :Y: I'm demoing the dpa300bs in Zurich next week.

Look forward to how you find the JLTi against Bert's Border patrol amp.


Cheers,
Brian

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Gainclone amps

by GC, Sunday, March 13, 2005, 10:59 (4698 days ago) @ GC

Hi Brian,

PS 4mv of hum from my WAD KAT88 amp through the oris gives a nice solid
foundation to the music.

Can't you make the amp more quiet? Is that the cause for your hum because 4mV isn't that much to give a solid foundation...perhaps you've a ground loop somewhere?

Simple test is to disconnect one channel completely (inputs too) to hear if the hum is the same. If it is much less then it is not the 4mV that is causing the hum...

Ciao,

Bert

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Gainclone amps

by GC, Friday, March 18, 2005, 16:55 (4692 days ago) @ GC

Hi Bert,

Simple test is to disconnect one channel completely (inputs too) to hear
if the hum is the same. If it is much less then it is not the 4mV that is
causing the hum...

Hum still there, the amp is known to be noisy and I have a number of mods that I can do to reduce this including DC heater voltage. However, even with the hum the horns sound great, another issue is my partner has now shown an interest in listening to music....I wonder if I can fit the horns in the shed:-D


Cheers,
Brian

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What's the verdict?

by GC, Saturday, March 19, 2005, 21:01 (4691 days ago) @ GC

....I wonder if I can fit the horns in the shed :-D

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What's the verdict?

by GC, Sunday, March 20, 2005, 20:44 (4690 days ago) @ GC

....I wonder if I can fit the horns in the shed :-D

...need a bigger shed :^(

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