Brother-in-law of Zen

[Fuling]

All amps need good power supplies:

Edit: The PSU consists of a 400VA 2x24V transformer, 4 x 10 000uF 40V caps and 2 x 25mH 3A (airgapped) double C-core chokes. The heatsink will hold two capacitance multipliers for further smoothing and slow startup.

[Fuling]

One channel without cover:

[Fuling]

Both channels operating late one night, the voltage reference LEDs shines a bit too bright for my taste:

[carpenter]

tell me more about your power supply. It looks beautiful. I'm a believer in filtering chokes. I run an LCLC filter on my ZV7-T. It's dead quiet, even with 110db 1w1m horns.

John

[Fuling]

Thanks!

I strongly believe in CLC och LCLC filtering whenever quiet power supplies are needed. I got a bunch of these chokes from a surplus store a couple of years ago and I think 25mH will be more than enough to make this amp completely silent.

After the CLC filter comes this IRFP260-based capacitance multiplier, I need to drop a few volts and, most important, have a slow startup to avoid damaging my speakers.

[Fuling]

I finally got some top plates on these babies:


Now when they are finished I realize that cascoding the output stage probably would improve things quite a bit (not that they don´t sound marvellous as they are) but ripping them apart and changing the circuitry would be too much work.
There´s also a risk of damaging the threadings by removing and reinserting the bolts too many times and i DON`T want that to happen (again...).

The PSU remains unfinished since I´ve been doing a lot of prototyping and started (and almost finished) a X-Soz project simultaneously.
Once the X-Soz gets finished I´ll hook everything up in an nice and hot biamped setup

[carpenter]

now there's a sexy pair


nice work, just in time for the holidays.

John

[Fuling]

Thanks!

Their big, balanced brother will also be finished soon I hope