05-02-2022, 07:55 PM
I owe you an apology Mondial. Everything is ok now. I have not removed the chassis from the radio so i measure all the tube voltages with a small washer that fits over a pin and a wire attached to it. Sounds odd but it works but goes slow. The other day as i stated i had that higher voltage on only one tube (the 6j5 and the nos i replaced it with) and all the others were lower, 5.8 at the time, The few i checked.
I have been using a bucking transformer to reduce my mains voltage currently at 123 today and was trying to use the heater voltage as a guide as i have stated. My bucking transformer lowers voltage about 12 volts so 111 to the set today . You had asked me to check a few other voltages and to be honest i did not even know about where the other filament tubes were. Thank you. I made a list from the schematic and off i went ------ all now at 6.0 or so volts - both filament strings ...hmmmm... i rechecked the offending tube (6j5) and sure enough at 6.0 volts.
SORRY!!, i don't know what happened. I originally checked the other tubes within a few minutes of finding that 7.0 volt 6j5 the other day when i got 5.8 volts on the other tubes..
So i think i know what happened at least some of it. When i rechecked today with mains at 123 and no bucking transformer attached ALL my heater voltages were about 7.0. My notes also show when the mains were at 117 the other day with the bucking transformer on i had heater voltages at 5.8. ( so about 106 at the set) So... maybe the bucking transformer maybe it malfunctioned during that time, maybe by pulling the tubes i reconnected a bad contact ( that has happened before ) ...I dont know. But all are at approximately 6.0 now except the the 6b4g's are at 6.3 nd 6.25. The plate voltage is a little low at 210 on a few i checked but i suspect that is because of the lower mains now.
So again i am sorry. This junior member did not mean to waste your time. I did learn some things so thank you.
I hope you will help me again in the future if the need arises.
Thanks
Bill
I have been using a bucking transformer to reduce my mains voltage currently at 123 today and was trying to use the heater voltage as a guide as i have stated. My bucking transformer lowers voltage about 12 volts so 111 to the set today . You had asked me to check a few other voltages and to be honest i did not even know about where the other filament tubes were. Thank you. I made a list from the schematic and off i went ------ all now at 6.0 or so volts - both filament strings ...hmmmm... i rechecked the offending tube (6j5) and sure enough at 6.0 volts.
SORRY!!, i don't know what happened. I originally checked the other tubes within a few minutes of finding that 7.0 volt 6j5 the other day when i got 5.8 volts on the other tubes..
So i think i know what happened at least some of it. When i rechecked today with mains at 123 and no bucking transformer attached ALL my heater voltages were about 7.0. My notes also show when the mains were at 117 the other day with the bucking transformer on i had heater voltages at 5.8. ( so about 106 at the set) So... maybe the bucking transformer maybe it malfunctioned during that time, maybe by pulling the tubes i reconnected a bad contact ( that has happened before ) ...I dont know. But all are at approximately 6.0 now except the the 6b4g's are at 6.3 nd 6.25. The plate voltage is a little low at 210 on a few i checked but i suspect that is because of the lower mains now.
So again i am sorry. This junior member did not mean to waste your time. I did learn some things so thank you.
I hope you will help me again in the future if the need arises.
Thanks
Bill
