hk 560

Hello to all who take an interest in the post here. First a bit of background. This is my first go at repairing a vintage electronic anything so a novice level is where I'd place myself at. The equipment that I have to work with to figure out what is going on is a trusty volte meter, a dim bulb...

Hi I recently acquired an Vintage Harman Kardon HK560 that behaved a bit different upon testing it on my DBT: Start bright, goes dim but after 5-10 seconds starts to light up until it is maybe 50 or 60% bright, not really full bright. Is it safe to power up without DBT or is there an indication...