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It's an ok circuit, but can be non-linear when the devices are compromised. They go very leaky, even short during AC line spikes from local lightning strikes. Been there... I removed those two FETs from my two Haflers and put in a sealed DPST Relay. Much better. My new GPulseLinear Preamp design...

Hi All! I just received the REV-A Board set. I added the "OPTIONAL" features, as separate assemblies... so it's easy just to build only what you want in the design. 1. The 4 power amps/ headphone driver: If you don't want it or need it, build it that way. Simple. You can always add it later if...

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 Mark, I'm very close to purchasing the REV-3 boards this week. I'm getting 3 sets. I added all options to the 1st REV build. Its very tight mechanically, so I'm considering a 3.5" high rack type chassis. Costs me $175, blank with no machining. The price will go down with quantity, and so I...

I added The Headphone jack to my new board design ( but it does not mute the line levels, since most people would just power off the main amplifiers). The four 10W power amps for the stereo and Ambience outputs are muted when NO headphone jack, or speaker jacks are plugged into. Dedicated +/- V...

I understand the surface mount chip apprehensions, but this is easier to do than I thought. Easy "touch-and-go", and its down, holding it in place carefully on the first pin with tweezers, then the rest is easy. I also have seen SMT to PDIP with pins as interface boards for sale. I used them on...

I corrected the schematic upload. All sheets of the schematic are now uploaded.

Hi George, I just posted the update. Thanks for your interest.

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...

Its a totally new layout. I'll be posting the up date tonight.

I used this one. I'm preparing to post a complete update tonight. This chip is beyond belief great. None better at this time, and hard to believe that anything else new would ever make an improvement.

Those op-amps have phase shift...and so some can be unstable driving the capacitive DC blocking circuit. Easy fix...put a 50 to 100 ohm resistor in series with the back-to-back DC blocking caps on both channels to isolate the capacitive loading. I have a new design on this website for a cleaner...

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...

Thanks for your interest! I'm adding easy upgrade options, so the REV-2 PCB will easily accommodate them. 1. 10W / channel @ 8 Ohms and is a DC coupled Headphone / speaker output board with 30W +/- 15V DC REGULATED Power supply. 2. Peak reading Level indicators. I thought plug and play upgrades...

Preamp update: Options getting implemented, before releasing the design for Rev-2 PCBs. 1. I designed a 10 watt / channel headphone amp. Drives speakers easily, and sounds great! To add the option, just removevthe smaller power supply board, and install the larger supply, and amplifier board...

A stepped attenuator...nice. I'll check. Could also be a digital encoder for a D to A analog converter. To complicated. Then...you can use a remote for drunken dudes who wont get off the couch! Lol. These pots sound nice and feel nice, and can be easily cleaned if needed. Not sure if the came...

Peak detector working nice. Added a sensitivity switch for lower listening levels...1V RMS is max...10V RMS is max for the preamp (30vac peak to peak). Im adding a very low distortion 10 watt/channel stereo amp option / power supply option for bedroom speakers. Just a plug in. Remove preamp only...

I did the same, and put the green Led on the front panel, as the "on indicator" on all my phase amps. Nice to know the delay is working properly, and the amp is healthy.

I do have updates...I'll upload them soon... when I finish the peak detector. Thanks for your interest my friend.