Nobody goes away hungry... 🙂
Or one could take the view that the 1K amp could probably sell even better if priced at 10K... 🙂
Someone offered up a Tube based input buffer a few weeks ago ...looked interesting. How hot would it get though? Boggit would need to punch holes in the top of case to let them dissipate heat, I suspect; may not be feasible
You have some excellent speakers, I assume that they are possibly slightly brighter than mine if you find the Bursons too forward and the Sparkos good although maybe its something else in the system.
We are all in the same earth. 7.5k is ~2000 Big Macs (using your example🙂).
That's a lot of food 🙂.
The point was that a 7.5k pre, to drive 1k amp is a little to much. Isn't it?
Lets get back to finding the best solution for an input buffer for boggit's amp, which is a very interesting subject (in this thread). And your contribution on this, was significant so far. Keep on!
Yes agree we need Boggit to design the best possible buffer.
Although I suspect it is not as easy as we think.
At present the buffer he designed works well for me with the Sparkos or Bursons but some have found that they get a little hiss with the Sparkos and LM4562 because as I understand it higher efficiency speakers.
So he needs to uprate it to cover all of the initial op amps that can be used with higher efficiency speakers and then he needs to see if it will still work on numerous other op amps both inexpensive and expensive.
Quite a bit of work I think.
Or we could use the standard Hypex one 🙂
Not sure that is really feasible. Not all of those opamps have the same specs. A circuit optimized for one might not work very well for another one - and do we want a "sort of OK on the average" compromise?
Now now, don't become soft on Boggit!
He's on a brake until May, thanks to Hypex.
He is just having fun at hi-fi shows now!
We (his customers) have to push him to work harder to perfect his buffer 🙂!
By the way, I would also like to see some credible (measured) specifications of the amp including the buffer with the offered opamps. Performance measurements too 😉!
It will be helpful in matching other components (source - speakers).
Yes agree this is the sort of problem that I mean. Probably best just to optimise it for a few.
Only problem is which one is best as I have said before I find the Burson best for me but others have found they prefer Sparkos
I wonder if Hypex would give up their discrete design schematic? Someone needs to X-Ray the nc400 board ;-)
That's why there was a smiley at the end of my comment. 🙂
You have hit the basic problem with subjective evaluations - they are subject to individual taste. That is why I rely as much as possible on objective tests and strive for neutral transparency in my gear - any subjectively pleasant coloring is best added separately.
Could you maybe put that link on here Sir Julf...and or any related schematics? I've started to read a bit about electronic symbols (still a Novice of course)!
Would be interested to see what he has done there 🙂
Thanks
I think Linear Audio archives are only available on paper, but some of the more interesting stuff was also published in EDN (that used to be Electronics Design News).
The only Bruno article Linear Audio has online is the famous "The F-word", mandatory reading for anyone into nCores.
Anyway, if you look at who writes for Linear Audio you might want to buy all the back issues anyway 🙂
The concept of subjective prefence of one opamp over another? Trust me, I get that all too well...
According to my quick modelling each op amp in the input buffer is not going to be called upon for more than 30mA even at absolute full power...