Thanks, used it today for a couple hours loading up two trucks full of well seasoned avocado wood, hauling and stacking. Played some Dr. John in memoriam.
I’m a fake RF guy too. It’s an old Apple AirportExpress that only support 2.4. I’ve scanned and use the least used channel in the area so it’s not an issue.
In memoriam? Dr. John died? Dang…
And here we go again. Much simpler modifications. It’s for the Center Channel 901. The crappy transformer, the three Power Supply Capacitors (top left), and the AC Filter/Neon lamp will be removed. Clean DC Power will come from the “Dog’s Breakfast” EQ. LED to replace the Neon bulb. Surface Mount Vishay 1% Thin Film 0603 Resistors, KEMET Yellow Tantalum’s for the various DC feeds. The SMT equivalent of Transistors will go on the underside of the PCB. For temporary, I ordered an Active Volume Control stuffed PCB. Future plan is to add a remote Volume control with digital display from eBay. By going SMT, I free up a Ton of space. Soldering 0603 package components without a microscope and my Wife’s Eyebrow Tweezer’s wasn’t easy and I’m not getting any younger 
Configured as a True balanced setup single channel. Should be complete before the weekend. Forgot to order a few parts from Mouser. Shipping was 3x the price of the components & I did I this twice :face_with_symbols_over_mouth
To save a few bucks, I had some Solen Caps which I stacked as 5uF. The tiny 15nF Solen Caps are put in the Bass Circuits only but the big single 5uF’s are for the output only
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Not sure how I missed this but that is pretty bad ass!
I have no life…LOL.
Thanks Jeff. The EQ is the Secret Sauce that turns these Turds into Treasures. “Components Matter”
I finally got it working this morning. Had solder shorts on two Surface Mount transistor’s (I told you Guys this wasn’t easy). The sound is OK but my Dog’ Breakfast Bose Series 2 EQ hasn’t better Bass extension and midrange. It my be the cheap Solen’s I put on the output stage. The lack of big beefy Toroidal ike I have the Dog’ Breakfast may be another reason. Anyway, it’s good enough to run my Center Channel 901, so I pleased with the results.
Gonna leave it in single ended Stereo Mode for the Weekend and convert it to dual mono XLR terminated Balanced next week.
Were getting there. Ain’t a Dog’s Breakfast anymore. Still have the active center channel volume control to finish. Once that’s working, then I’ll remove the transformer (covered in copper tap) and remove the two silver and one black capacitors. The 3 DC voltages will be tapped off the three big black KEMET capacitors on the left of the box (next to the little volume control PCB).
The two channel true balanced L & R channel is up and running again. The only time I hear any noise is when the SGCD/Preamp is set to 100 and it’s so low, you never hear the noise when playing at normal or apartment level volume. Final pics hopefully by the weekend.
Center Channel volume is Passive (for now). Had a nasty GND loop even though I’d star GND’d everything to one point. Still have a slight bit of hum on The right side is quiet. Blue LED’s intensity matched the power buttons of my PSA gear. 
Wonderfully fun!
