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The custom part is fine, The P-Spice simulator nailed it. I have a company willing and vey able to make it. I will obtain all the fabrication info to 2nd source it as part of the re-Engineering effort. It will be a plugin...so no extensive changes at all. I really love how it settled down...

Gents, an update on the GPulseLinear 2000 preamp. Just waiting for a custom made toroid inductor to add to the "Rumble Filter" that is a unique design that does NOT affect the RIAA Curve at all. Not a High pass filter that commonly used and affects the sonic performance at 20Hz! Its a SHARP...

Hi Jim, I've been very busy with my GPulse-Linear Preamp, ready for production. Picture attached. I also designed the final versions of the XLR Converters. Boards going out for purchase, as well as the Chassis Box design. Attached is the sheet with the Three converter boxes. Your interested in...

Update on GPulse-Linear Preamp: I was noticing the typical Rumble from the turntable (AR X7 belt drive manual) at high volume, and decided to tackle that as a special effort in the preamps design. Well...I used PSpice modeling software and engineered a terrific discovery! I was easily able to...

So today I connected my AR77XB turntable to my preamp, and Wow...sounds amazing. I also made some max noise measurements on the phono stage (inputs horted). Volume control at max, tone controls out, and low Freq EQ off. I have never witnessed a more quieter preamp. The sonic quality is measured...

Hi gents. I just packaged up the Rev-B boards into the new chassis and did some in depth testing. I hope you all like the look. You can build it as a kit, purchase the subassemblies as you like. Or...purchase built and tested boards, or the entire plug and play fully tested preamp. Send me a...

Update: I had to spin another board for the Phono version. The balanced converter chip had onboard gain fixed...so the RIAA feedback did not work. My oversight. I added the preamp chip that I already use in my GPulse2000 to a new design... so when that comes in I'll test it. Its a 3 chip...

Hi. I tested the XLR Driver and receiver with an XLR cable between them. I did have a few issues with a land trace that went missing...and fixed it. That driver chip is distortion LESS. below the test instruments measuring capabilities of .001% . Noise is NO contribution at the floor level of...

I have a few Hafler preamps D110s. Sound really really good, but those push in switches become very noisy and hard to fix. I bypassed the tone "in/out" switch since at Center Tone controls measured flat response anyway. I also bypassed the loop in/out switch, so now loop in now bypassed with...

Here is a link to "popcorn noise" in op-amps. It's a rare problem and it's a "bad" chip that is a statistical perturbation in the manufacturing chips. I'm sure techs and Engineers reading this will find this very interesting. https://www.advsolned.com/example_popcorn_noise.html

Popcorn noise is a real op-amp phenomenon! Lol. Intended Pun? Lol.

usually true with the added noise...but the chip is spec stated at -104.7dBu Un weighted, with the laser trimmed internal resistors! The Distortion + Noise -120dB (22dBu, 22KHz bandwidth). The added external components are not in the signal path, except for the DC blocking Nonpolarized caps on...

I'll be testing the receiver over this weekend. Its built, just waiting for the dual phono connector coming tomorrow. The Driver converters, in a few more days...with RIAA curve network in the feedback path using the same chip. The Non-RIAA curve driver will be tested next. Should be awesome...

Phase Linear 2000. Separate tone and turnover frequencies for each channel, with that beautiful Ambience output for the rear channels. I did upgrades to mine, and also designed a super better version of it (GPulseLinear 2000, Kit or assembled and tested) from the bottom up. The attachment is a...

I'll keep them. Get UL certified, or add a disclaimer about the AC in the manual. I designed all sorts of equipment for Military, Industrial and commercial use with never any issue. Note...the outlets are grounded, and fused for 600W combined, as stated on the real panel. Connectors are 1500W...

I will verify again on the 2nd prototype... I used .004V (4 millivolts) to measure the 10V RMS at line output. I used a flat DC resistive 40 dB attenuator from a line level source generator at 1KHz. 68 dB gain or so just at clipping to make that measurement. I forget what cartridge I have in the...

Agreed. The assembly instructions are extremely helpful in the smt learning process. If anyone wants to try a subassembly first...I would suggest the Power supply, then the precision peak detector display...Then decide if you want to take on the main preamp board. That board is 1206 resistors...

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...