02-21-2009, 07:11 AM
I have not swapped out the rectifier, but it was tested. I don't see how a short or whatever in the rectifier could INCREASE the B+ (which is STABLE, by the way).
I wish I could get a definitive answer on the issue of operating a 25hz transformer on 60hz. Other forums as well as some individuals with which I have consulted have stated that doing so is not a problem, but doing the OPPOSITE would be a problem (running a 60hz radio on 25hz - which no longer exists). The explanation I was given was that a 25hz transformer (or 50hz for that matter) has more iron as well as a higher primary inductance than a 60hz transformer. Thus it actually runs COOLER on 60hz. That is also my experience with this radio. Eddy current losses may be higher. In my case there is no transformer heating, and the actual wattage when operating is only 60 watts (spec is 85). Now that is with 110 volts AC input through a bucking transformer. At 110 volts input, the B+ is a little high, but likely OK. For now, I will continue to operate the set on 110 volts. I suppose I could install a series resistor if I ever decide to sell the radio, or at least warn the buyer.
The probability of finding a suitable parts set for this rare Zenette is likely zero. These guys go for big bucks, at least on eBay. But I will keep an eye out just in case a parts set shows up.
Dave
I wish I could get a definitive answer on the issue of operating a 25hz transformer on 60hz. Other forums as well as some individuals with which I have consulted have stated that doing so is not a problem, but doing the OPPOSITE would be a problem (running a 60hz radio on 25hz - which no longer exists). The explanation I was given was that a 25hz transformer (or 50hz for that matter) has more iron as well as a higher primary inductance than a 60hz transformer. Thus it actually runs COOLER on 60hz. That is also my experience with this radio. Eddy current losses may be higher. In my case there is no transformer heating, and the actual wattage when operating is only 60 watts (spec is 85). Now that is with 110 volts AC input through a bucking transformer. At 110 volts input, the B+ is a little high, but likely OK. For now, I will continue to operate the set on 110 volts. I suppose I could install a series resistor if I ever decide to sell the radio, or at least warn the buyer.
The probability of finding a suitable parts set for this rare Zenette is likely zero. These guys go for big bucks, at least on eBay. But I will keep an eye out just in case a parts set shows up.
Dave
