Sunday, October 2, 2011

Aikido Pre-amp Project - Part 8

It is easy to get carried away & fall pray to unnessary desires & unrealistic wants.

Time to put on my contractor hat & give the whole PSU a final round of scrutiny.


Virtual capacitor
I have never suffer premature valve failure other than applying brute force with a blunt object on them... I've yet to see any valve died of voltage stress... Seriously, what can 30ma current surge do??? or even 300ma??? Tubes are built to take brutality like fish in water!!! So it will reduce the valve life from 200,000 hours to 180,000hour... so what!?
Aikido were born with PS ripples cancellation. Let them do what they do best!
This is a class A1 amp, the load behaviour is almost a constant current and the signal source will most likely be solely fed from a CD player or a DAC with 2Vrms signal, it will never come close to clipping! Moreover, since it is not a power buffer stage with transformer coupling, high power supply Zo is not a real issue.

Why bother with the extra works when one can get away with it???

Another visit to PSU2 & came up with these component numbers, the damping is sightly over 1 which is where my preference lies.

and the following is what I'll build.

Final check,

A costumed RFI/EMI common-mode filter,
All important last line of defence, 0.1A fuse,
The indispensable power rocker switch,
Obviously essential IEC power socket,
A spikes treated rectifier bridge,
A snubber treated choke,
A CLC network which gives a well damped & quiet B+,
A floated AC filament supply with twisted solid core leads.

This should put everything back in prospective & an end to the PSU design...


Another look at the chassis...

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