Mad_K said:
Yes. Your starting point is your open loop bandwidth, which might be no more than 10 Hz or so. The more feedback that's applied, the greater the bandwidth. Of course the converse is true. For a given level of feedback, as you reduce feedback, you reduce bandwidth.
Typically as long as you keep your gain under 100 (40dB), you'll have plenty of bandwidth.
se
right now.. I get it nowpreamp
Thanks for all the replies. How about an opamp based preamp? It seems as though a gainclone can be built compact enough (save the power supply) that I can put both channels and preamp into one unit to exclude the cabling from preamp to amp. I know this doesn't sound "High end" because it is just basically an integrated amp. But, so what. I think that as long as enough attention is paid to detail it should (stressed should) come out alright. I am thinking about BoSoZ unbalanced. But because it is designed for balanced input and output then why not just go for an opamp based solution? However, I'd like my preamp to run class A. Or maybe just forget it and build SOZ and BoSoZ.
Any suggestions?
Vic
Thanks for all the replies. How about an opamp based preamp? It seems as though a gainclone can be built compact enough (save the power supply) that I can put both channels and preamp into one unit to exclude the cabling from preamp to amp. I know this doesn't sound "High end" because it is just basically an integrated amp. But, so what. I think that as long as enough attention is paid to detail it should (stressed should) come out alright. I am thinking about BoSoZ unbalanced. But because it is designed for balanced input and output then why not just go for an opamp based solution? However, I'd like my preamp to run class A. Or maybe just forget it and build SOZ and BoSoZ.
Any suggestions?
Vic
Re: Another question
That would be the main technical objection. Steel is ferromagnetic and doesn't magnetize/demagnetize linearly. How significant it would be for such a relatively small piece of steel is debatable.
If nothing else, steel rusts and as we all know, rust never sleeps.
se
vic said:
That would be the main technical objection. Steel is ferromagnetic and doesn't magnetize/demagnetize linearly. How significant it would be for such a relatively small piece of steel is debatable.
If nothing else, steel rusts and as we all know, rust never sleeps.
se
Another reason why it may not be a good thing is that it would have to be well-damped to stop it 'ringing'.
I should imagine that being such a physically small amplifier, the Gainclone needs very careful housing and this has been shown to be the case by PD's experiments, both with casings and the method used to support the amp.
Some people try and avoid any type of metallic enclosure and the Gainclone would be easy to put in a plastic case with just some copper/aluminium foil for shielding. Of course, you will always have a metallic heatsink!
I'll Try These Things Oneday....
Hi Peter, I have experimented with differing insulators and found differing sonic characters also.
Heatsink paste is another consideration too.
If you lap both heatsink surfaces on very fine wet'and'dry on a sheet of thick glass, you can get very prcisely flat surfaces, and then no need for heatsink paste, or make your own from 'nice' ingredients.
Another experiment I intend to try is to mount the ouput devices directly to a block of copper or silver, that is then insulatively mounted to the main heatsink mass, ala one of Grahams mounting arrangements.
This I fully expect will cause substantial change to overall sonic character.
It is notable that Denon used a thin sheet of copper between the output transistors and insulation/heatsink in one of their monoblock amplifiers.
I would also try silver or gold foil between the device and the copper mounting block as a further experiment, and I fully expect that this would alter sonics too.
If you try this please tell us of your results.
Eric.
Have you tried valve springs yet ?
Peter Daniel said:Normally, I always use either beryllium oxide or aluminum oxide (for Europe
Needless to say, I changed the wiring for copper and silver plated copper plus I changed the insulating pad for aluminum oxide and the sonic character of the amp changed. It is very similar in tonality to LM based GC, but with a promise of a cleaner sound and more resolution. I have to play it more, to pass any conclusive opinion.
Hi Peter, I have experimented with differing insulators and found differing sonic characters also.
Heatsink paste is another consideration too.
If you lap both heatsink surfaces on very fine wet'and'dry on a sheet of thick glass, you can get very prcisely flat surfaces, and then no need for heatsink paste, or make your own from 'nice' ingredients.
Another experiment I intend to try is to mount the ouput devices directly to a block of copper or silver, that is then insulatively mounted to the main heatsink mass, ala one of Grahams mounting arrangements.
This I fully expect will cause substantial change to overall sonic character.
It is notable that Denon used a thin sheet of copper between the output transistors and insulation/heatsink in one of their monoblock amplifiers.
I would also try silver or gold foil between the device and the copper mounting block as a further experiment, and I fully expect that this would alter sonics too.
If you try this please tell us of your results.
Eric.
Have you tried valve springs yet ?
Nuuk said:
That would apply to virtually every metal you'd likely make a chassis out of, not just steel.
As far as mechanical vibration issues are concerned, it's small size works to its advantage. The smaller size means any resonances will be much higher in frequency, where there's less energy to bring about vibration in the first place. Also, the higher the frequency of the resonance, the easier it is to damp.
PLASTIC!?!?! Yecccch!
se
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