Over time, we have accumulated several Scientific Audio Electronic (SAE) vintage audio products to support our in-house engineering test needs. As with all electronic devices, there are failures that occur. So, we started to manufacture our own spare service parts. However, a number of the electronic components are no longer manufactured. It was decided that we would make modifications to the printed circuit assemblies to allow for the use of newer components. Soon, the part redesign took on a life of its own. We found ourselves fixing problems, adding features, and making modern improvements – because we could.
The sample photos are of the SAE MK2400 and 2400L spare parts that we manufacture and have made available for purchase. To date we have manufactured two versions of the Speaker Protection PCA with shutdown disable, a later version of Audio Driver PCA, a Servo Off-Set control module to eliminate a potentiometer and the LED Meter PCA with all matching LEDs on a single board.
The SAE A301/501 Audio Amplifier share the same driver PCA design. We redesigned a new PCA for these drivers in both the left and right sides. The new PCAs have better heat sinks for the voltage amplifier transistors and a new surface mounted matched dual transistor for the input differential pairs. Please refer to the photograph example. Note: Because some of the original parts are no longer available and the newer parts do not fit the enclosure, this PCA is only available without the RCA jacks.
The last project we did was a complete new power supply design for the SAE 2800 Parametric Equalizer. Our goal was to reduce the noise level from the 60 hertz mains showing up in the audio signal content. Please refer to the photograph example. Note: Because some of the original parts are no longer available and the newer parts do not fit the enclosure, this PCA is only available without the inter-board connector pins, RCA jacks, and push-button switches.
Over a decade ago Fujitsu a leading manufacture of electronic parts discontinued the production of their FRB211 series small signal relay. The size and physical pin-out/footprint was unique. So, any products that used the FRB211 relay would no longer have a source. The solution for new product manufactures was simple -- just use a different relay. SAE had several products, notably the P101 and P102 Audio Preamplifiers, in the marketplace that used some 20 each of this relay. However, after decades of use these products were failing due to these relays going bad. Without a replacement, there was no option to make the necessary repairs. We are now having replacement relays manufactured for us.
All sample PCAs on this site are the property of Gibson Engineering & Computers, Inc.