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Old 7th Apr 2016, 2:17 pm   #75
Mark James
Hexode
 
Join Date: Apr 2012
Location: Chorley, Lancashire, UK.
Posts: 257
Default Re: Cossor 3339 Oscillograph(Scope).

Had to put the 339's on one side until recently for various reasons, but they are now both finished! To update - the one I was building on the original chassis ... I did all the basic checks and powered it up on an isolated variac (very cautious about the 1200volts!). Very strange result, no trace on the tube and intermittent voltages registering. Eventually tracked it down to two faults, firstly a non-functioning tube and secondly a fuse holder which was only intermittently conducting. Picture attached shows all functional eventually!

Mark
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