Hi all,
I acquired the 2 scopes from tautech, & managed to repair the faulty one which had high intensity. The fault was repaired by replacing IC 1 on the PSU board, which is a 4011, used as an adjustable duty cycle oscillator feeding the HT adjustment transistor. My life was made a lot easier by be able to obtain manuals with fully readable schematics. In addition some calibration notes & the mods which were done for the units used by the NZ Navy. Hopefully I will succeed in attaching them.