Re: Pilot U650
Finally the post arrived with a large 1500 ohm resistor to substitute for the field coil for testing purposes. The current Magnavox FC is 3200 ohms, std speaker was 1400 ohms.
With the resistor in place all plate voltages improved by 50V & Screens by around 20V so all much more in the ball park to the spec sheet.
Fitted a new output valve and the volume has now roughly doubled when on max and drawing less current with plate voltage increasing by 10V.
NOS magic eye arrived and looks great but doesn't open & close very much - staying around 3/4 open so need to look into that.
The "Kenable" PU Jack lead has also arrived so will test this out and report back.
So, should I be looking for a replacement speaker at around 1400 ohms? are there other options? Can the 3200 ohm remain? thanks
|