Quote:
Originally Posted by Keith
Well, I have replaced the EY51 with a NOS Mullard part. The initial result was not promising.
Suddenly, after about five minutes, everything changed. Brightness was restored and the focus now optimised at about half travel of the lever.
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Given that your NOS ey51 had not been used for tens of years, I suppose its always possible that its cathode needed some time to re-activate and become emissive again. If that's the case, the "fault" won't recur. Anyone seen a NOS valve need a few minutes to become fully emissive again on initial use?