"Roost, Mmmmmmm, let me see! I seem to remember these from the early seventies. I think I've seen one before but this is a first on the workbench. It was brought to me by a pleasant young man (Paul) from Mansfield Woodhouse, about 18 miles from my home town of Nottingham, UK. This Roost Session Master 50 was completely dead! Whilst Paul was here I decided to try and do the job over a couple of cups of tea and many interesting conversations.
After a change of the broken power fuse holder and one of the EL34 grid two resistors, the replacement of a couple of other tired components, a spray of all the potentiometers, tube bases, jack sockets, and the like, it all burst into life. I changed the first ECC83 as this was suspect in being partially short, as both of the plate resistors gave-up whilst it was on the bench. A bit unusual........ hence why I suspected the tube. After this it all seemed fine and was doing a good 50 watts plus.
Note the original Fane 2 x 12" drivers with square magnets; quite a rare sight nowadays.
I have since heard from Paul who is well chuffed with the results. It was nice to see one of these again after all these years.
Cheers for your interest, John"