Dave wrote:

Swopped the tubes and now they are both stable!



Nice one ... glad to be of help.
Dave


Much appreciated.
(Has this thread become scrambled on your machine? Here it's
mixed in with M-i-L's SatNav.)

--
Jeweller
R100RT
Formerly: James Captain, A10, C15, B25, Dnepr M16 solo,
R80/7, R100RT (green!)
www.davidhowardjeweller.co.uk