Brown Audio Labs

Brown Audio Labs Custom Loudspeakers and Home Audio Electronics for both the consumer and professional audio client.

02/18/2026

Well it looks like another review could be in the works from Dick Olsher, this time it will be the A series preamp, I'm excited to see what happens.

I think I made a good move, I'm moving all my UA723's to tube heater regulation, much better than the 3-pin 78** series ...
02/05/2026

I think I made a good move, I'm moving all my UA723's to tube heater regulation, much better than the 3-pin 78** series regulators, I'm using precision op amp stabilized designs for my main HT regulators. The curcuit below the heater regulator is my mute curcuit , I program microcontrollers to handle this task, as well as my remote volume controls.

Well Cary Audio has the SPL-05, AR had the SP-10, and 11, well I figure I need my reference preamp, the same two chassis...
02/02/2026

Well Cary Audio has the SPL-05, AR had the SP-10, and 11, well I figure I need my reference preamp, the same two chassis setup, the power supply in one and the signal stages in the other. The signal stage is comprised of 8 beautiful octals, 2 6SL7 gain stages for the RIAA, and 2 6SN7's for line level, both stages having paralleled cathode followers. The power supply is also something of a thing, op amp stabilized with 2 - 6AU5's for pass devices and a 6JD6 pentode voltage amplifier, and 2 very beefy heater supplies. Each channel is isolated by 4 op amp buffer stages.

I believe this is my go to PS for my control amplifiers, the heart of the supply is a low noise NE5532 operational ampli...
01/28/2026

I believe this is my go to PS for my control amplifiers, the heart of the supply is a low noise NE5532 operational amplifiers, that has its own regulator, the reference is a 6.1V zener biased with a MOSFET to give the Vref a constant current source, which is then buffered by the first op amp, and the second acts as the error amplifier. With the 6V6GT pass tube, 40mA+ of clean current is available.

The SP-3A Stereo Console is underway, with some great features, and with the newest precision power supply,it should ha...
01/28/2026

The SP-3A Stereo Console is underway, with some great features, and with the newest precision power supply,it should have some great sounds, also added a balanced input/output board for those who like to use balanced connectors. The phono stage is 12AX7 based, using passive RIAA equilization, and the line stage is 2- paralleled sections of a 12AU7 gain stage, buffered by a source follower output for low output impedance and extended freq. response. Keep watch for more incoming updates!!

Going for a whole new look and more functionality, with the balance control made permanent, and a stereo mono switch add...
01/24/2026

Going for a whole new look and more functionality, with the balance control made permanent, and a stereo mono switch added. With a choice of black with silver k***s or white with gold k***s.

Preamp is ready to ship to customer!!
01/19/2026

Preamp is ready to ship to customer!!

The newest SP Preamp (Series B)main board. The phono stage still uses a passive RIAA setup, the line stage is a single t...
01/16/2026

The newest SP Preamp (Series B)main board. The phono stage still uses a passive RIAA setup, the line stage is a single triode coupled to a source follower for low ouput impedance, the output caps are MKP's, the large 10uf of capacitance insures the best bass response.

My 2016 SP-1A pre upgrade is just about ready to ship, the power supply uses a LM358 op amp for error correction, and th...
01/14/2026

My 2016 SP-1A pre upgrade is just about ready to ship, the power supply uses a LM358 op amp for error correction, and the V-amp and pass device are tubes, pretty much a super regulator!! The line stage is 2 triode sections in parallel of a 12AU7 with a source follower output, really nice sounds!

I haven't seen this preamp in quite a few years, one of my early models. I'm refurbishing it for a client. This is the S...
01/06/2026

I haven't seen this preamp in quite a few years, one of my early models. I'm refurbishing it for a client. This is the SP-1A model that uses the 12AX7 in the phono stage and the 12AU7 in the line output.

Just finishing up a design of the power supply for the SP-1B, the heart of the regulator is a NE5532 dual op-amp, one is...
12/16/2025

Just finishing up a design of the power supply for the SP-1B, the heart of the regulator is a NE5532 dual op-amp, one is used for a voltage reference amplifier and the other acts as the error amplifier, driving a 6JD6 pentode voltage level amplifier for the pass tube, it's been tested with a load of 42mA and everything looks good so far. This goes in the next preamp build.

It's been 35 years or more since I built a solid state audio component, but I took a glance at a 50W power amp, awhile b...
11/14/2025

It's been 35 years or more since I built a solid state audio component, but I took a glance at a 50W power amp, awhile back, and remembered the Audionics CC-2 that my Uncle had bequeathed to Me years ago, I remember it in His system, this amp was comparable to any Krell or Levinson Amp I had ever listened to at that time, So I'm going solid state on this one, I'm taking some of Robert Sickler's layout's and adapting it to this one, the Sickler amp front end is basically a high end Op Amp, and the BB OPA134 fits the bill, the output stage maybe needs some more work, but I think this stage it's pretty darn good!

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