ClassicAPI VP26 – Build

As I’ve mentioned previously on this website, I’ve been organizing a minimal home recording studio for Lee Safar for the album I am currently producing for her.  In order to save money and also get the best possible sound we can, I’ve decided to DIY a lot of the recording equipment.

Jeff Steiger, owner of the ClassicAPI company was amazingly friendly with all of the questions I had for him when deciding to purchase this kit.  After putting in the order, about a week later, the box arrived:

Everything was beautifully packed, and the initial reaction was “wow, this is one seriously professional piece of kit….”.

Here you can see the silk-screened front panel ( which was shipped in the wrapping it’s sitting on ):

Here is a glimpse of the input transformer, output attenuator and input gain control and associated mounting hardware:

These are the main front panel switches for Mute, Phase reverse and Pad:

Here is the wrapping for the main mounting frame:

The gorgeous input transformer:

A close up of the switches including the 48V Phantom power switch:

Here is the top and bottom of the PCB that comes with the kit:

Here is the whole lot on the table:

The first thing I did was set up the workspace ( yes, I am using a Country Road magazine as a work mat – that’s how I roll – I’m not quite as well setup as when I was working at talsit‘s house! ):

Then I put in the resistors:

Followed by the diodes:

Then the latching push switches:

Then the blue Murata ceramic capacitors:

Then the large capacitors, radial and standard electrolytic went in.  The Mill-Max sockets also went in at this stage.  You’ll notice the botch job of the large 470uF capacitor with it’s horrible soldering.  A note to those building this kit – use flux!  I didn’t and it made soldering to the ground pads exceptionally difficult due to the massive thermal inertia of the exceptionally thick PCB.  I bought some flux the next day and used it to fix up that area ( which you will see in later photos ):

The input transformer went in next:

Then the output transformer ( also note the cleaner solder joint on the large axial 470uF capacitor that I cleaned up by application of flux and re-soldering ):

You can see the output attenuator now after being added:

Next the 48V Phantom power switch went in, and I started to assemble everything into the main frame, along with the front panel:

Next the knobs went on to the potentiometers:

And that was the end of the basic ClassicAPI VP26 build.  A preamp isn’t much without an amplifier now is it?  So the next part was building the gar2520 Discrete Operational Amplifier (DOA) – which performs the actual amplification task.  It’s a compatible physical layout to the original API 2520 units ( which can also be used in this kit as DOA’s ).

The first part of the gar2520 build is the pins for insertion into the Mill-Max sockets of the main VP26 board:

Next go in some resistors and capacitors:

Then the diodes:

Next are the main transistors:

Now we add some more resistors and capacitors:

And more:

And more:

And more:

And more:

And more:

And then, finally, the last parts go in to finish off the gar2520 DOA:

Now the DOA can be inserted into the main board:

And now it’s time for some modelling shots of the finished ( but untested ) product….

And now for some close-ups:

And there you have it.  Next up, the Neve-style Sound Skulptor MP73 build.  Stay-tuned for that, and the testing of this pre.

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Written by etheory | Author's Website

evolutionary theory aka Luke Emrose is an electronic music artist living in Sydney, Australia, who composes a diverse range of genres from Electronica, Trance, Drum and Bass, Trance, Progressive House and Classical. His influences are many and varied, from Deadmau5 to Noisia, Beethoven, Erik Satie, Armin Van Buuren, Dom and Roland, Calyx, Teebee, Above and Beyond, Concord Dawn, Gabriel & Dresden, Jay Z, The Temper Trap and The Beatles, to name but a few.... Luke is currently producing an Album for Lee Safar due for release later this year. Stay tuned!