24-08-2017, 03:25 PM
A friend who's not on the forums pointed me towards Cricklewood Electronics who have a stock of the later TI/Thorn R2008 line output transistors. At £1 each! I've ordered a few.
In the meantime the original LTB board with the squre transistors is looking promising. There's a problem with the regulator so I've got it on an external PSU for now. It's happy, it's locked and I took the scope probe off the collector of the top transistor when it reached 400V p-p. I don't have a high voltage probe, nor a 100:1 probe and my 2465B scope only goes down to 5V/cm.
I'm going to go for broke and hook up the EHT board. Again with external power so I can bring it up gently.
In the meantime the original LTB board with the squre transistors is looking promising. There's a problem with the regulator so I've got it on an external PSU for now. It's happy, it's locked and I took the scope probe off the collector of the top transistor when it reached 400V p-p. I don't have a high voltage probe, nor a 100:1 probe and my 2465B scope only goes down to 5V/cm.
I'm going to go for broke and hook up the EHT board. Again with external power so I can bring it up gently.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
