mecha
Well-known member
The 2n3055 is for 12 v operation on williams supply, it directly feeds br2. It supplies +5 on an atari arII, but is stepped down on voltage. The +5 is handled by the 6057
You can increase +5 by removing r10 and staying in tolerance range, but I like to replace r26 with a pot to make it adjustable.
tally ho. I think the 6057 is on the large heatsink on a Defender power supply -- I had a couple of those bottomed out at 2V, wound up reseating that transistor and brought those back. I had a remote feeling you were right considering how much of a detriment a 12V transistor failure can be particularly on the Defender power supplies (shoots like 24V through the 12V line I think?)

