With 3 mounting rails you can install the Filter PCB and SRPP stage onto a second horizontal layer that can be handy for soldering or modification.

Our Newsletter to get interesting informations about new projects. Wiring to the Frontpanel Potentiometers PEQ OPA Gainstage With this filter board you can reproduce any kind of the modern or vintage passive equalizer frequency pattern - just wire up the required frequencies you wish to controll on your front-panel. The Full Filter Kit includes pre-confectioned wires that allow wiring pots and switches fast and easily. Classi PEQ is compatible to tube SRPP stages and can be used for example with the GPultec SSRP stage or the OPA stage as well. Classi PEQ is compatible with the sweet sounding EF inductors that come close to the original Pultec Inductors, RM-Inductor or there is an additional pin-bank to wire up any vintage Inductor with similar specifications, Sifam, Cinemag or the original Pultec Inductor. Optimized grounding, audiophile designed signal pathes and a nice selection of the best parts for each frequency-band make this PEQ sounding outstanding. However, the street prices for classic gear like as the Teletronix La2a, Pulse Technology Pultec EQP nd UREI or General Audio 1176 - mainly because properly as high-quality brand-new will not be and equivalents - had been out of series with my budget, and more realistically, my application. It uses a passive circuit, but includes a tube gain make-up amp to add the. Pultec Equalizer Schematic Series With My Pultec Equalizer Schematic Series With My. The filter circuit is based on the vintage EQP-1A with a great range of additional frequencies. This magical dual mono EQ unit is based on the old Pultec designed EQP-1 tube. The PEQ Filter PCB is a high quality Filter PCB to build a passive equalizer project. Inspired by the legendary Pultec passive EQP design the Gyraf Audio Gyratec XIV uses the same parallel filter topology as its older predecessor whilst extending. Which also means that there are suppliers for most parts, including e.g. Last, these filters are very often made as DIY-projects in pro audio - there are long, long threads about them at e.g.

Granted, the Q can vary slightly with DC resistance, but this more or less only affects the maximum available Q, and the unit is rarely used at its full extreme anyway (doesn't sound good at full high boost).Īs for an explanation of the filter workings, see attached image - an attempt of graphically explaining what goes on. utilizes the original WESTERN ELECTRIC passive-equalization circuit found in. Note that the inductor values are rather easy to calculate from knowing its frequency AND its capacitor - as it's simple series resonance circuits. for purchasing the Manley Laboratories Enhanced Pultec EQP-1A Equalizer. GIF schematic is not from a Pultec, but from Tubetech's clone of it, that I looked into around the turn of the century. Manufacturer: A-Designs Basic description and contents of package Product classification: Pro Audio - Recording - Equalizers Safety instructions Startup and. Even the recent bought-name American company 'Pulse Technologies' falls into this category. There has been several recreations of the Pultec equalizer over the years.

Pultec equalizer schematic