This describes how to start safely testing your Bryston 4B (old model) after replacing power transistors, insulators, electrolyitc capacitors and the bias trimpot.
Start by using two series adjustable power supplies with current limiting function. Check distortion , adjust bias current. Only then move on to full AC input voltage testing. An oscilloscope and tone generator are needed. You could also use an variac (adjustable transformer) if you have one.
Until sure that everything is working I used a 1,5A fuse (the external one).
The pdf with the checkout procedure for this model can currently be found here: www.bryston.com/PDF/Other/3B_4B_Pre-NRB_TECH_REF.pdf
27 ноя 2016
