10-04-2005, 07:52 PM
Anybody know how much total B+ current this radio should pull (as measured right off the #80 rectifier filament pin) ?
I have measured around 120 mA on one of these sets which seems to be working fine, but I don't know if this is normal or if it is too high. I haven't replaced the filter condensers and I really don't want to get into that if I don't have to. I am measuring the current based on the voltage drop across a 0.100 Ohm resistor using a Fluke 189 meter on the DC millivolts scale.
As it is, the power transformer runs a little hotter than I like, and I'm thinking this may be due to excessive load on the B supply. When I plug in a very weak (good filament, zero emission) #80 tube, the transformer runs barely warm, so I'm pretty sure that a good part of the heat is coming from the HV winding load. I just don't know how much is "normal".
Thanks,
DD
I have measured around 120 mA on one of these sets which seems to be working fine, but I don't know if this is normal or if it is too high. I haven't replaced the filter condensers and I really don't want to get into that if I don't have to. I am measuring the current based on the voltage drop across a 0.100 Ohm resistor using a Fluke 189 meter on the DC millivolts scale.
As it is, the power transformer runs a little hotter than I like, and I'm thinking this may be due to excessive load on the B supply. When I plug in a very weak (good filament, zero emission) #80 tube, the transformer runs barely warm, so I'm pretty sure that a good part of the heat is coming from the HV winding load. I just don't know how much is "normal".
Thanks,
DD
