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As an Electronics Engineer I designed a new distortion less Preamp with Ambience rear channels... similar to the Phase Linear 2000, but much much better. The overall design is 99% complete. Offered as a kit, also semi kit with tested PCBs, and also complete built and tested. That is posted...

As an Electronics Engineer I designed a new distortion less Preamp with Ambience rear channels... similar to the Phase Linear 2000, but much much better. The overall design is 99% complete. Offered as a kit, also semi kit with tested PCBs, and also complete built and tested. That is posted...

This is my work bench, with new prototype premp. Made a bunch of refinements to the design. 4 channel ambience, distortionless and dead quiet and accurate phono stage. All simulated and modeled for best specs ever. Best Preamp I ever heard. Building 3 for the first run on Rev-A, more boards if...

Hi Listeners, I have been working hard on this project and am posting this latest update including the preliminary specification sheet that includes the overall function, pictures, test results., schematic and THE MAIN UNCUT PCB board, WITH NAMES OF FUNCTION. 8 SEPARATE BOARDS, SEPARATED WITH...

Hi "Listeners", I have completed the new design preamp. It Mimics the Phase Linear 2000, but much better in many ways. See attached Preliminary Info Specification write-up, schematics, waveforms, and a short video clip playing a record. 1. Super low distortion "RF Type" op-amps. .000015% THD 2...

I just received the first PCB today. This...should be the lowest distortion, lowest noise preamp at any price! THE BEST AND LATEST OP-AMPS, LAYOUT AND SIMPLE TO BUILD AND REPAIR. The latest Lowest distortion, lowest noise op-amps available. Film caps in signal path, Regulators, careful...

Well...Harbor freight has this great bench for $99 bucks❣ NIce size, two drawers, Led lighting, AC outlets, and peg board! I mounted NEW load test box up on pegboard, scope and Audio Generator on top shelf. Room for big projects, and lower shelf to store parts bins. Perfect. 100 bucks...Ill get...

Those two FETs at Q15 have to go. They do degrade the audio a tad and can go "leaky" reducing the output level. Sometimes they short completely and the channel is dead! I removed the FETs and put a relay there instead. Much better. I used a 5V DC low current relay with the coil tied to ground...

Well... I purchased one off E-BAY. The guy said it was in perfect working order for the $300 bucks. NOT! No Big deal... very clean and not butchered at all! So... Rear Channels don't work, Ambiance control not working, Volume pot very scratchy and worn out, all switches noisy / intermittent. I...

Well, I finally got tired of this. The two preamps I have, have this pesky problem. I decided to JUMP them switches out in the positions that keep the TONE CONTROLS ALWAYS ENGAGED, AND THE EXTERNAL PROCESSING LOOP (ELP) ON all the time, and installed jumper cables on the back, in case I want to...

Hi to all, I just finished my universal testing load box for monster amplifiers: 1. Uses 300-Watt 8 Ohm Resistors, fan cooled 2. Has all the switching for: A. Open Load B. 2, 4, 8 and 16 OHMS, Power Dissipations based on Impedance chosen...up to 1200 Watts C. Dual LCD metering for each channel...

Well...the low level scrungy sounds from a source non-selected is now improved on my Hafler D110 preamp. The separated grounds from input to output IS A PROBLEM WITH THE SOURCE SELECTOR SWITCH GROUNDING UNSELECTED INPUTS! I fixed it by almost 30db, by adding a very heavy common wire ground from...

I all, I'm almost done with this 700 Watt on the bench: 1. Original Control board fully re-capped. 2. New 15,000 uF Power supply Caps, and 60 Amp Bridge Rectifier, Cut the GND plate to eliminate the original insulators on the + side of the caps, that arced over. 3. Installed Speaker relay...

I posted in on Face book if anyone wants to look there: https://m.facebook.com/story.php?story_fbid=pfbid0op6EJgZdq8TCk1ynDk2RCZNcPzZXXA1aSrnBNb2siQAyjAAQ8rwGZ6J4E5Nka3ufl&id=100000115705087&mibextid=Nif5oz

I just purchased these volume pots for my 700w thats on the bench. These have a smooth feel to them, and hopefull noiseless. The old ones...terribly noisy. Just cut off 0.275" off shaft in a vice with a hack saw. file anything sharp off. Then knobs will fit nice, and hopefully sound great...

Good for super clean 10V output Distortionless 10hz to 50kHz flat. Bipolar +/- 18V power supply rails used for ALL amp sections, DC coupled, and almost zero DC off set at outputs. Amazing preamp, but hard to clean controls 4 sure. I removed the FET timed mute at turn-on, decided to add a...

George here, Amateur Radio Operator AB2KC Working at Brookhaven National Laboratory Just Rebuilt 2 PL400 Series 2, 1 400 series 1, and a 700W series 1 (In process) All with Relay Boards, New PS Capacitors, recapped/ or new boards. Designed my own 700W series 1 relay Board... using the UP1237...