Tag: 28 step AVC

AVC finished

Today I soldered the remaining connections to get the second channel up and running. The result is impressive. The AVC project is now finished. And I’m a happy bunny.

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The sound is stunning. As good as I was expecting to be. Very detailed and no loss at bass or treble. The combination of 4P1L driving the AVC and the 814 input step-up transformer seems to work much better this way. The 4P1L preamp has no challenges in driving the AVC, however the full signal swing from the 4P1L step-down via by the AVC seems to sound extremely well.

Thanks to Dave Slagle for such a wonderful AVC. I measured the AVC and matching with a FR sweep and the scope. I was pleased to see the matching between channels and also the nice response 10Hz up to 30-40kHz.

Hard work to wire but it’s worth every penny, trust me…

I have also tried a new set of interconnect cables I made using PTFE shielded RF coaxial. Very simple to build and with nice performance.

The AVC is placed very closed to the power supplies (as you can see on the picture below). The AVC is still very quiet and there is no hum picked up due to the system layout.  Lucky me.

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Slagle’s AVC project

It’s been a long time since I had the chance to do any work on audio. I’m working on my solid state amp albeit very slowly. I need a volume control before I get the opportunity to install the new solid state system.

The Slagle’s AVC have been waiting for more than 6 months. I’ve been put off by the milling and woodwork involved. I simply don’t like that work. I found time and energy today to get started and managed to make very good progress.

I used existing 4mm aluminium top plates I had at hand, hence the layout of this box. The hardwood frame has a first coat of wax. Need to add a second to reinforce the tone and make it slightly darker. The rotary switch is a  Russian 28-step military unit. Way more cheaper than the expensive hi-fi ones. The AVCs are from Dave Slagle. They have a fantastic reputation and having heard them before there is no doubt this will be a great addition to my system.

I had to build a mounting frame for the AVCs. This support unit will hold the AVCs to the top plate. I have also added a mute switch which is quite handy.

Soldering the AVC is a daunting task. Something I will do another day.

Happy Easter!