New Audio Note M10

[Gabdx1]

Separate power supply and only a simple preamp circuit. and not even a remote (?), no display. There is better gears around for less than 1/4 price imo.

No phase control. No mono option for old LP, no operating hours for tubes of this price. No mute.

[limono]

There is a legend (regardless ,well or wrongly earned ,also not all people with money are idiots without taste or ear.
Some of them buy it because it's an Audio Note and some because they already had stuff with phase control, mute , remote display and many other things and they prefer to spend money on AN because it sounds the way they like it. (I'm not saying better)
Comparison to a car is a nonsense.
Regards

[kevinkr]

Well I am somewhat surprised because this shunt regulator sounds extraordinarily similar to a design I used over 20yrs ago in my first pre-amplifier design, and I considered it to be at best derivative of prior art - not that I could have afforded to patent it in any event.

I have included an example of the earliest design (which dates from 1988 - 89 time frame) which I used in only the prototype pre-amplifier design, and which I subsequently determined did not meet my performance objectives. A high transconductance high mu type like the 5842 would perform much better in this particular circuit. (The D3A triode connected is another good choice.) A moderate mu type like the 5687 ought to be interesting enough particularly with a CCS instead of a simple resistor to the supply.

Not identical perhaps, but I suspect more than a germ of the idea is there, and this very topology is shown on John Broskie's site.

Edit 1: The 12AU7 is a terrible choice for this circuit, due to low gm, low mu, and not so low rp - hence not recommended. It was I thought, the best choice based on what I knew at the time, and what was then commonly available to prospective customers..

Remember SPICE was not readily available, nor machines capable of running it, therefore everything was calculated, it worked but conferred little benefit I could measure and none I could hear. There really wasn't enough loop gain to do the job well, dc spot on - ac performance mediocre. The supply on the other side of that resistor was a good series pass design that I still use to this day.

Edit 2: The output would be about 300V @ a few mA or more, and in the input supply would be between 360 - 400V ideally. I used one of these to drive each circuit block in the pre-amplifier.

[LinuksGuru]

Regarding "exclusive" power supply - I have seen something very similar published in Russian Radio magazine at the beginning of 60th, it was a simple technique to add just 1 cap in tube voltage regulator and thus, lover 50Hz noise considerably.

My 0.02$.

[Zen Mod]

Originally posted by kevinkr
Well I am somewhat......

well - ya need old fart to recognize old fart

attached shunt from audio Innovations L2 , later modified iteration ;
I think it's still somewhere on AN UK site .

TP2 is feed point to load

[kevinkr]

Originally posted by Zen Mod



well - ya need old fart to recognize old fart

attached shunt from audio Innovations L2 , later modified iteration ;
I think it's still somewhere on AN UK site .

TP2 is feed point to load

I use the 5651 and 85A2 as references in both shunt and series pass regulators, and guess what..

I guess what they say is true, there truly is nothing new under the sun, and I guess more to the point is whether or not AN should have been able to patent this concept at all. Clearly not original.

[Audiohifi]

Hi Kevin

I have one of your schematics dated 30 August 1998 titled Bal_pre PSU.
You use 6BQ5 and a12AX7. I wonder is this something similar

I can scan and post if you allow me to do so

Thanks

[piero7]

Originally posted by Audiohifi
Hi Kevin

I have one of your schematics dated 30 August 1998 titled Bal_pre PSU.
You use 6BQ5 and a12AX7. I wonder is this something similar

I can scan and post if you allow me to do so

Thanks

Please, post it

[Audiohifi]

With Kevin's permission I post it
Please note that it is his interlectual property right, not for commercial use
He has also clearified that it is a series pass not shunt regulator

[piero7]

Thank you!