26-02-2012, 02:09 PM
Hi Joe, If the anode voltages on the magic eye is ok and the heater voltage is up to scratch then it is usually down to the magic eye valve itself, the sensitivity of the eye ie: how far it opens and shuts would normally in a good valve depend on how far the grid voltage swings between off signal and tuned into signal, all other things being ok that is. Also bearing in mind that to get an accurate idea you would have to monitor the grid with a relatively high impedance meter or scope set to dc.
As regards the 100pf & 500pf capacitors then I would say that disc ceramics would be ok providing the voltage rating on them is ok, failing that silver mica would do the job.
Hope this is of some use.
Good luck which ever way.
Lawrence.
As regards the 100pf & 500pf capacitors then I would say that disc ceramics would be ok providing the voltage rating on them is ok, failing that silver mica would do the job.
Hope this is of some use.
Good luck which ever way.
Lawrence.
