Just enter the values - using the SM values we have 8 x 10,000µF & 69V (there is extra capacitance in the system of ~880µF x2 @ 69V but I'll ignore that).
Which leads to:-
Charge Q = 5.52 Coulombs
Energy E = 190.44 Joules
Is that what you wanted ?
It depends what you are looking for - I simply calculated the energy reserves of the Main PSU capacitors ignoring any other capacitance which could arguably be counted for the Main Amp energy reserves. (like for example the 4 x 220µF capacitors on each driver board).
Not a very meaningful calculation if you expand it to the whole amplifier, don't you think?
Well, no pre-amp as such in the AU-X1 - so if we take the Flat Amp as the pre-amp this will be 4 x 100µF & 47.5V
Which leads to:-
Charge Q = 19 milli-Coulombs
Energy E = 451.25 milli-Joules
If we calculate for the MM Head Amp 4 x 330µF & 47.5V this gives
Charge Q = 62.7 milli-Coulombs
Energy E = 1.49 Joules
A grand total of 81.7 milli Coulombs & 1.94 Joules for the pre amp stages. (excluding the MC Head Amp as only MM OR MC can be active).
Recalculating after adding the driver board capacitance to the total for the Main PSU capacitors gives :-
Charge Q = 5.641 Coulombs
Energy E = 194.63 Joules
And a grand total of:-
Charge Q = 5.7227 Coulombs
Energy E = 196.57 Joules
What all this means I'm not sure - we know the AU-X1 sounds great
Ah right - yes that's an Alps I think, pretty much the best generally available pot, certainly back then. They can show their age (oxidisation) and are difficult to service (push nuts!) as it likely wasn't expected that they would be still in use this many years down the line.
Yes we should - another 8800µF & 68V :-but shouldn't we include the filter caps (I believe 2 x 2200µF x 100V - not sure the of the rail voltage)
Using the coordinate system that Sansui uses you can see the voltage mentioned in square F4 & 5 (i.e. bottom right - F-2781) of the full page schematic (on page 14) of the SM.Also, where can I read the 69V rail for the main filter caps (and EI filters) on the schematic?
Yes we should - another 8800µF & 68V :-
Charge Q = 598.4 milli-Coulombs
Energy E = 20.346 Joules
Grand total now
Charge Q = 6.3211 Coulombs
Energy E = 216.916 Joules
Using the coordinate system that Sansui uses you can see the voltage mentioned in square F4 & 5 (i.e. bottom right - F-2781) of the full page schematic (on page 14) of the SM.
Just to add on i believe the Alps pot(Big Volume Knob) is from their Black Beauty series, and are still highly sought after by many enthusiasts. The series should be from RK40.
Yep!I need to stop reading about X1's and I need to stop working on my customers one as every time I plug it in and listen to it, I want one......they are an extraordinary amplifier rivalling the best there is to offer today!!
Not necessarily just the high speed amp, but other components of the design like the Current Mirror circuit in the front end of the driver circuit, the direct coupled design, so less distortion, less phase shift....there's a lot of reasons they sound the way they do.Yep!
I have to say it is brutally revealing. Some recordings I thought sounded OK before with other amps sound terrible with this amp. But good recordings.....geez!
Its pretty amazing for sure, I think the main things about the sound for me is that it is hugely authoritative with my big KEFs, plus (like I mentioned above) pretty much everything you play thru it makes it seem like you were previously listening to that music as an mp3 file (or something). And you only hear the full details on the track once you play it on the X1.
Do people feel the same way about the 919 I wonder, is this the "high speed" transistor thing in action?