![]() If you are interested, send him an email here. Our customers range from professional recording studios based in the United States, Europe and Asia to small project studios run by small business owners and music recording. George Ntanavaras still has stock of PCBs to build the PR-3 preamplifier. Welcome to FiveFish Audio We provide DIY (Do-It-Yourself) Mic Preamp Kits, 500-Series kits, Power Supply Kits, and API VPR Certified audio modules for the 500 series rack. Read the complete article as published in audioXpress magazine. The transformer actually gave a larger voltage 2x 17.4 VRMS, since the PR-3 preamplifier’s required power was much ![]() Suitable for use in low-level load analog circuits.įor the PR-3 preamplifier’s supply, I used a low-noise toroidal transformer with a nominal output voltage of 2x 15VRMS at 15VA. I used high-quality relays from Panasonic, type TXS2-12V-1 with AgPd contacts You can easily assemble the kit and start using your microphone preamplifier in no time. This kit includes all of the necessary parts, including resistors, capacitors, potentiometers, switches, connectors and more. Each input has one dedicated double-pole relay that completely connects or disconnects both the positive and the negative part of the signal from the preamplifier circuitry. The DIY Microphone Preamp Kit is a project that will show you how to assemble your world-class microphone preamplifier. The selection of the input signal of the preamplifier is performed by three high-quality relays per channel. It is a single opamp with a Difet input circuitry, which offers high accuracy, extremely low input bias current, and very low noise performance. It provides ☓1.3VDC with no load after rectification and filtering. ![]() Fujita, has taken all those specific features and specifications into consideration and we are happy to welcome the release of the newly designed TU-8500. For the past 8 years, hobbyists have been asking for certain features to modify the TU-875 phono amp kit. Each main supply is good for just under 1A, with 1.1A total for both. Elekit TU-8500 Stereo Tube Preamplifier Kit. It also sends +15V to the input relay board, and 22VAC to the preamp for the protection circuit. After some investigation, I selected the Texas Instruments (TI) precision field-effect transistor (FET) op-amp, the OPA627. The power supply provides ☒4V for the two DOAs and ☑5V for the OPA2134. The selection of the op-amp was one of the most important decisions for the design. ![]() The circuit board is double-sided and extensively covered with a copper ground plane. Please also review the Safety page on this site.Most of the preamplifier’s circuitry is contained on one circuit board for ease of construction. S-PRE – London Power Spectrum Bass PreampĬombine a tube preamp with PSU-PRE to make a stand-alone preamp. LP-PRE – London Power 2-Channel Guitar Preamp The Preamp Series Kits include: Preamp Kits by London Power Pssst!… We now offer a variety of chassis suitable for preamp kits and other projects – see our Rack-Mount Chassis page, or view them under Building Supplies. Tubes, wire and chassis are not included, as each builder will have his own preferences and aesthetic requirements. Tubes and PCBs can be mounted in any orientation in larger chassis. Component packages include metal-film resistors, plastic and electrolytic capacitors and 16mm pots that accept push-on knobs.Īll boards and assemblies will fit within a 1U rack-mount chassis height (we have these here). The phono preamp board was 80 (including shipping) so I bought one. Kits include instructions, the printed circuit board (PCB), socket(s) and electronic components. Akitika sells a complete, stand-alone, phono preamp kit that includes the preamp, power supply and case (about 250 + shipping), but I wanted to make a custom version, and thought I could build the case and power supply myself. For elaborate preamps incorporating up to 21 tubes, use the PSU-10 actively regulated power supply.Įach kit uses a silk-screened fibreglass-epoxy printed circuit board to make assembly quick. London Power’s Galactic Ground is used for low noise and low hum. The PSU-PRE power supply supports up to four tubes and allows multiple preamp kits to be combined to create a multi-voice system. The London Power Preamp Kits series allows hobbyists to build a stand-alone tube preamp for guitar or bass.
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