David Kulka
Well-known member
For sale, complete UA LA-3A Limiter motherboards w/transformers and other components. These are surplus fully loaded motherboards that were built by UA for their LA-3A limiter reissue. They are fully populated and assembled, except for the T4 cell and 250K "zero adjust" pot. Each motherboard has a Cinemag B11178B input transformer, UA 22-0018 output transformer, and a step up autoformer for the T4 cell. All resistors, capacitors, and semiconductors are installed, including a Sprague output capacitor and two pairs of MPSU05/MPSU55 power transistors, which are expensive and hard to find. The motherboards are in good, clean condition.
The motherboard is basically ready to go except for the T4 cell and 250K pot. Of course, to build a complete LA-3A you'll also need the enclosure, power transformer, and all the panel parts. (Most of these parts can be purchased from me separately, if you're interested.)
I'll include an original LA-3A schematic but beyond that, I don't really have time to offer any construction or troubleshooting help so after buying, you're basically on your own. That said, the board is very clearly labeled and the circuit is relatively simple, so building a complete LA-3A around this board will not be difficult, as DIY projects go.
Cost is $300 each plus shipping. 7 of these are available, limit of 2 per buyer, please. Payment by paypal, credit card, or check. To buy please reply here with the quantity you want and then PM me with your shipping address so I can invoice you. Thanks!
The motherboard is basically ready to go except for the T4 cell and 250K pot. Of course, to build a complete LA-3A you'll also need the enclosure, power transformer, and all the panel parts. (Most of these parts can be purchased from me separately, if you're interested.)
I'll include an original LA-3A schematic but beyond that, I don't really have time to offer any construction or troubleshooting help so after buying, you're basically on your own. That said, the board is very clearly labeled and the circuit is relatively simple, so building a complete LA-3A around this board will not be difficult, as DIY projects go.
Cost is $300 each plus shipping. 7 of these are available, limit of 2 per buyer, please. Payment by paypal, credit card, or check. To buy please reply here with the quantity you want and then PM me with your shipping address so I can invoice you. Thanks!