I did my visual checks this morning, everything seemed OK so I plugged them in.
No sound.
After some checks with the DMM, and guided by a faint whiff of overheated component, I traced the fault to the anode CCS on the gain section of 6DN7. They had both been used on another amp (can't remember which one), but I was surprised both had expired.
Anyway, two new ones were fitted and wired up and now they both work. Just listening to Auberge as the first test track and sounds good. HT is a bit low, but I started with a 1uf first cap and I will try a 1.5uf next when I can get hold of a pair.
So, now they are up and running it's time for major surgery on 833a.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)