Tuesday, November 17, 2015


There are so many good DACs these days...

Here's one I did with an async USB receiver based on the XMOS micro controller and the PCM5102A.  It is 32 bit and 384kHz capable.

Friday, October 23, 2015

Monday, October 19, 2015

Message In A Bottle - SE 6V6 Stereo Amp

The other day while cleaning up the workshop, I happened upon a power transformer from an earlier Darling build, a old DAC-41 chassis, and a pair of 6V6s. What to do...I hate to admit it; but, I'm into repurposing lately.

Searching through my parts bins, I quickly gathered a pairs of RCAs jacks and binding posts, an IEC socket, some 7 pin miniature tube sockets together with a pair of 8532s, a couple octal tube sockets, a couple B+ capacitors, and a pair of Dueland Alexander coupling caps. Add a pair of budget output transformers, that just so happen to fit in the chassis, and I had all the major components of a little desktop amp.

So, I jumped on line and order the balance of what I needed to complete the build from Digikey. Following is the result, a little bit of a tight build; but, a message in a bottle, if you will, in a chassis just over 6" squared.

Friday, October 9, 2015

A custom built 10 Squared featuring 27 part sources including nickel interstage and output transformers from Dave Slagle.

Wednesday, October 7, 2015

Breadboarding a new flywheel B+ power supply for a 300B build...stay tuned!

Monday, August 31, 2015

Here's an amplifier that I build back in the day based on an article that appeared in Issue #3 of Sound Practices entitled "A 5 Watt 6BX7GT Triode Amplifier" by Ed Warden.  The main differences here are: (1) this is a stereo amp whereas Ed built mono blocks and (2) this amp has vacuum tube rectification as opposed to solid state.

The power transformer is a robust unit from Allied Electronics and the vacuum tube rectifier is a 5V4.  There are separate LC filters comprised of Hammond chokes and Nichicon capacitors for each channel.

The input tubes are 6SL7WGTs and the the output tubes are 6BX7GTs, obviously.

The output transformers are metal cased units - donors from a hi-end vintage integrated amp.

All of the coupling capacitors are Mundorf Silver and Oil - somewhere in the neighborhood of $250 worth themselves.  The RCA jacks are Vampire and the binding posts are 5-way types.  All of the tube sockets are ceramic.  The balance of parts are well known quality types.

This stereo amplifier is a solid 5 watts - all triode, push-pull (PP) watts that is and, as a result, works well with a wide variety of speakers.

The amplifier is built on a chassis measuring 16 inches wide by 8 inches deep by 3 inches tall.  Overall height is approximately 7 inches.  It weighs 13 pounds.

The guy that owns it just traded up to a much more expensive amplifier from me, so I am helping him with the sale.  I just ran the amp across the bench and through my system - it checks out fine.  He is asking $750 shipped in the US.

Feel free to call me at (513) 417-0130 should you have any additional questions.

Friday, August 28, 2015

Below is a 10Y DHT line stage prototype that I recently built.  It features a current sourced, shunt regulated B+ power supply and Rod Coleman filament regulators for the 10Ys.  Additionally, the 80% nickel output transformers are from Dave Slagle.