13-04-2017, 03:03 PM
![[Image: IMAG0514.jpg?dl=0]](https://www.dropbox.com/s/cciklrevmxd4z7e/IMAG0514.jpg?dl=0)
Hi Guys,My first post is a thank you! Have recently acquired a CRB3 to test caps in valve amps at their working voltage. There were the usual problems with duff caps in the tester but having replaced them could get nothing from the magic eye. When I checked the wiring I discovered the EM34 HT was connected to a 16uF cap but nothing else. I was up against it without a schematic and after a lot of searching, found this thread with the manual - absolute god send!! It's now up and running and a cracking piece of kit for checking those high voltage caps! By the way of a thank you, I've scanned the schematic and added values (measured), so hope that might be of use to others lucky enough to lay hands on one of these.
It should be noted that there's an added 62k resistor in the EM34 HT feed - I was concerned that the voltage was significantly higher than is usual for this magic eye (390v versus 200-250v). It has reduced the voltage to approx 250v, which will hopefully extend the life of the EM34.
Thanks again - pic of CRB3 and scan attached.
Les (newbie).






