This V76 microphone preamplifier has up to 76 dB of gain. The original design combined a input pad with a gain switch, but this lacks flexibility and would not work well with a DI. This build splits the pad to a separate switch (matching the origina
       
     
Builds / V76 Tube Preamplifier
Based on the RCA BA-2 preamplifier, this build has up to 50 dB of gain. Built with an original set of transformers and two 1620 tubes, which are a low noise 6J7. It is a simple, but beautiful sounding microphone preamplifier.
       
     
Builds / BA2 Tube Preamplifier
The Neve 33609 is a diode bridge compressor. A matched bridge of diodes attenuate the signal based on a control voltage. It is a masterpiece of design.
       
     
Builds / 33609 Compressor
The 990 discrete opamp (DOA) designed by Deane Jensen, operating as a microphone preamplifier. A stepped gain switch up to 70 dB. This build has 8 channels packed into a 2U case.
       
     
Builds / 990 Preamp
The Neve microphone preamplifier 1290 was the same circuit found in the legendary 1081 & 1073 channel strips. This build adds the HPF from the 1073, to cut low frequencies during tracking, when necessary.
       
     
Builds / 1290 Preamp
This mic build is based on ideas from the legendary Neumann U47, but differs significantly. It retains the tube bias method that avoids a cathode bypass cap and routes the heater current through the cathode resistor to stiffen the response. The tube
       
     
Builds / EF800 (U47) Microphone
This build is a clone of the Trident A-Range console strip. It is a mic preamp or line amp followed by a 6 channel EQ: 4 mid bands and high and low shelves.
       
     
Builds / Trident A Range EQ
These tube DIs are inspired by the REDDI. They use a Russian Triode tube transformer coupled to the output. The output transformer was wound by CJ (at groupdiy) and is a spectacular sounding transformer. The close proximity of the power and output t
       
     
Builds / Tube DI
This mic pair is based on the ELAM251 circuit, but instead of the edge-terminated C12 style capsule, these use center-terminated U47 style capsules.
       
     
Builds / ELAM47 Tube Microphone
A tube amp built on a salvaged organ chassis with a pine wood case. The amp design is inspired by the Fender Princeton Reverb, including the blackface reverb and the Princeton Tremolo that modulates the power tube bias.
       
     
Builds / Princeton(ish) Tube Amp
This amp build follows the 5F6A schematic, which was borrowed by Jim Marshall for the JTM-45 circuit. Blackface reverb is added with the control knob on the back panel. The quad of 6L6 power tubes drive a vintage ‘60s Twin Reverb output transformer,
       
     
Builds / 5F6A Tube Reverb Amp
Several passive transformer boxes: a dual Western Electric 111C, a UTC O-10 Reamp, a Triad A10J, and a sandcast UTC LS-10.
       
     
Builds / Passive Transformer Boxes
The LA2A Compressor is a tube levelling amplifier with an optical gain control unit.
       
     
Builds / LA2A Compressor