09-02-2020, 06:05 PM
(This post was last modified: 09-02-2020, 06:08 PM by ppppenguin.)
The nasty kink in the middle is due to inadequate drive to the LOP. This in turn is because I turned down the main stabilised power rail to minimum to minimise chances of damage. Just not enough voltage available to give a nice clean drive to the LOP. I powered the line osc and drive from an external PSU which cleared up the kink but it won't lock. Decided to stop for the day and have a think about it.
The next plan is to run the LOP from an external PSU so the main PSU can be wound back up to its normal voltage. Once I've established correct operating conditions in the LOP I can return to making the whole thing work on internal supplies. To a first approximation the LOP supply voltage will need to be about 70% of that needed on 625. Since that will store the same amount of energy in the LOP on each cycle as on 625 the EHT and aux supplies should all be about right. LOP tuning and S correction will certainly need attention but I want a nicely locked picture before dealing with 2nd order problems.
The next plan is to run the LOP from an external PSU so the main PSU can be wound back up to its normal voltage. Once I've established correct operating conditions in the LOP I can return to making the whole thing work on internal supplies. To a first approximation the LOP supply voltage will need to be about 70% of that needed on 625. Since that will store the same amount of energy in the LOP on each cycle as on 625 the EHT and aux supplies should all be about right. LOP tuning and S correction will certainly need attention but I want a nicely locked picture before dealing with 2nd order problems.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
