rock soderstrom
Tour de France
bernatvm said:R1 (on the psu board) burns out. This happends when i connect the main board with the psu, powering on the psu unconnected doesn't make any smoke
Without the main board your PSU is stabil and with reasonable voltage output? This could be a sign for excessive current flow in your amp, due to a short to ground, wrong components (wrong biasing of the tubes) or faulty tubes on the main board. Please show a good photo of your amp.