01-19-2009, 11:22 AM
I am restoring a 690. Looking for an original speaker, but wonder if I find a correct sized one, but different field coil resistance. Can I just add the proper resistor in series and have it work OK? The original field coil is 4300 Ohms, shunted across the B+.
Also I notice that someone replaced the rectifier socket atop a transformer with an octal socket and are using a 5U4 instead of a 5X4. To a collector is this a big negative, or should I go back to the original?
Also would like to communicate with anyone who has/is done a restoration. Need all the tips I can get.
Also I notice that someone replaced the rectifier socket atop a transformer with an octal socket and are using a 5U4 instead of a 5X4. To a collector is this a big negative, or should I go back to the original?
Also would like to communicate with anyone who has/is done a restoration. Need all the tips I can get.
