:Initially the power conversion was working with the SS vibrator, or there would not have been that level of power to have done in that / those resistor(s). :The cathode of the 6X4 is putting out + voltage, so therefore you installed your electrolytics BACKWARDS POLARITY and pulled down the secondary power….thus the failure. I have ordered 10 K resistor to replace a burnt one between 1 and 6 of the 6X4. On the vibrator I have resistance between pins 1 and 2, 1 and 3, and 2 and 3. How can I tell if the transistor vibrator would have been damaged. ![]() to negative to chassis rather than positive. Hmmmmm that thing sort of looks like one from an old Stoodie Baker ? ….but it just may have been a later salvage yards add on. The series 10K resistor and the buffer capacitor forms a snubber and dampens those errant spikes. Its fer sure that the drive from a constant, clean square wave that it produces, is going to present a more uniform output from the secondary, than the sometimes hit and miss contact action of a mechanical vibrator exhibits with time.thus the presence of wild spikes on the secondary. I say this because it is dependent upon the design of the SS vibrator, as they might be operating at a higher frequency than a conventional conventional mechanical vibrator does. ![]() I am guessing that the SS vibrator is still OK….initially monitor your B+ and just put power on for just a second to see if it comes on up with just a quickīattery power application, then try for bit longer periods.Īs for the C15 bufferator capacitor.are you 'rat sure that the instructions with the SS vibrator say that you are still supposed to be using it, OR that the one that you are using is of a high enough voltage rating. Initially the power conversion was working with the SS vibrator, or there would not have been that level of power to have done in that / those resistor(s).īest to chunk those noo electrolytics, since one can not be absolutely, positively sure if they were damaged in the reverse and O/L situation. The cathode of the 6X4 is putting out + voltage, so therefore you installed your electrolytics BACKWARDS POLARITY and pulled down the secondary power….thus the failure. The rectifier on the H-V secondary, which is permanently wired one way, will always rectify in the same way, and so there are no worries of reverse polarity in the B circuit. A non-synchronous vibrator only serves the purpose of pulsating the voltage. ![]() Radios with non-synchronous vibrators will, of course, not be harmed by reverse polarity. At any rate, that radio didn't care what it was fed. A synchronous vibrator will only separate out what it is fed, and if it's fed the wrong polarity, it'll separate out the wrong polarity, I believe. I could even operate it from 6.5-7 volts AC. I've only owned one auto radio with a synchronous vibrator, a Blaupunkt, and it operated just fine with the power connected either way. Auto radios with original mechanical vibrators can usually be connected either way. Transistorized vibrators cannot be put in the wrong circuit. The primary powers the secondary through electro-magnetic induction in the transformer, but otherwise the two circuits are completely separate.īe sure that your vibrator is designed for a positive ground system. The primary and secondary circuits share the same chassis, but they are not electrically part of eachother. Electrolytics usually have the negative connected to the chassis (or items at a potential similar to the chassis). ![]() The secondary circuit (B circuit) is usually wired in the conventional manner. Positive ground has to do with the primary circuit only.
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