Save, restore, upgrade your Pioneer SX-1250 receiverFor sale, brand new power amplifier set of two blank pcbs with connectors installed
This design is electrically equivalent and interchangable with the original Pioneer design
Design improvements address a number of reliability issues regarding the original design
The pcb is double sided, 1 oz. copper cladding, green solder-mask, silkscreen printing for component identification
All high quality parts from leading manufactures. Parts at Mouser are ~$50US/pcb. Heatsinks are included.
This is intended for customers which have some prior experience in building electronic assemblies. Knowing how to read a schematic is benificial. We also offer a complete set of two assembled and tested modules in another listing
These are custom built to order.
What you will get.
- Two new power amplifier pcbs, set of two blanks with connectors installed plus supply of two heatsinks
- Full set of printed documentation and installation notes, link to cloud for pics and docs
- Link to Mouser shopping cart, to order parts. The cart is for one assembly, so you buy it twice for the pair
- You can contact us for technical support using supplied email in the documents
Improvements over the original Pioneer version
- The pcb material is much better, higher temp FR4 epoxy glass construction, LPI solder mask, double sided PHT, silkscreen legends
- Upgraded high performance heatsink to run the devices cooler, so they last much longer
- New temperature sensing design for pre-drivers, drivers and main heatsinks, dual BJT bias spreader, eliminates the use of the STV-4 diodes
- OnSemi MJE15032G/15033G drivers specified
- Precision metal film and metal oxide resistors, UES, UKL, UPW or equiv ecaps. All current production parts from Mouser &/or Digi-Key
- Easy installation/service, using the existing connectors and mounting plate. No soldering required for installation
- Connector pins are gold plated to prevent tarnish
- You need to adjust OutPut Stage Bias (OPS) using a DC voltmeter (DMM) and lead clip-on grabbers.This setting is required since your OPS transistors(bjts) are not exactly the same as the ones we use for testing (MJ21195/MJ21196). The design can use the original OPS bjts
- A DMM is required to set OPS bias however a inexpensive DMM can be used and precision accuracy is not important for the bias setting. A scope is not required
If you are not in any hurry, it's more economical to select "Canada Post Tracked Packet - USA" instead of "Canada Post Xpresspost - USA", it only adds a few extra days of shipping time and saves you some $. Both methods are insured postage.