Most likely electrolytic filter caps are shorted. They might have blown the original rectifier? Be sure to replace these caps before powering up with a replacement transformer.
Here is a list of available transformers:
http://www.oldradioparts.com/2a23efl.txt
You can also buy from AES, www.tubesandmore.com , Hammond transformers, Radio Daze and others but prices will he higher.
Norm
:i recently purchased a 1948 westinghouse h 166. it is an all original and in beautiful condition except for the fact that it has no sound. i was able to identify a bad rectifier (5u4g) and replaced it. when i applied power my transformer burst into smoke. i know very little about electronics. is it possible the transformer was already bad which caused the rectifier to blow or is it more likely that the new rectifier blew my transformer. either way i need a new transformer. it is a v-4761, where can i locate a replacement.
:any help would be greatly appreciated.
:Ron Womack
:Newman Lake WA
Hi Ron
::
:: Most likely electrolytic filter caps are shorted. They might have blown the original rectifier? Be sure to replace these caps before powering up with a replacement transformer.
::
:: Here is a list of available transformers:
::
::http://www.oldradioparts.com/2a23efl.txt
::
:: You can also buy from AES, www.tubesandmore.com , Hammond transformers, Radio Daze and others but prices will he higher.
::
::Norm
::
:::i recently purchased a 1948 westinghouse h 166. it is an all original and in beautiful condition except for the fact that it has no sound. i was able to identify a bad rectifier (5u4g) and replaced it. when i applied power my transformer burst into smoke. i know very little about electronics. is it possible the transformer was already bad which caused the rectifier to blow or is it more likely that the new rectifier blew my transformer. either way i need a new transformer. it is a v-4761, where can i locate a replacement.
:::any help would be greatly appreciated.
:::Ron Womack
:::Newman Lake WA
You need to add up currents drawn by the tubes using the schematic.
http://www.nostalgiaair.org/PagesByModel/118/M0024118.pdf
The 5U4 draws 3 amps so it's filament winding needs to be 5 volts @ 3 amps.
All other tubes operate off of 6.3 volts. This radio uses high current tubes for output, 6Y6. Each draws 1.2 amps. Most others draw .3 amps. Lamps draw .25 amps. You would need a winding 6.3 volts @ 6 amps or more.
High voltage is given as 290 volts. Look for a transformer rated 300-0-300 @ 150 ma. It may also be shown 600 volts CT @ 150 ma. or more. You need this high current as a pair of 6Y6's can draw 120 ma.
These are not exact currents. A little higher will be ok but the transformer will be larger. Larger will also run cooler.
Norm
:::thanks norm.
:please pardon my ignorance on this subject. How do I pick the correct transformer? I have a schematic for the radio but the only info that i can make out is that it is 290v (i think. it is hard to read). old radio parts. does not seem to have the exact model number. if i have to buy new how do i find out the specifications for this transformer?
:
:Hi Ron
:::
::: Most likely electrolytic filter caps are shorted. They might have blown the original rectifier? Be sure to replace these caps before powering up with a replacement transformer.
:::
::: Here is a list of available transformers:
:::
:::http://www.oldradioparts.com/2a23efl.txt
:::
::: You can also buy from AES, www.tubesandmore.com , Hammond transformers, Radio Daze and others but prices will he higher.
:::
:::Norm
:::
::::i recently purchased a 1948 westinghouse h 166. it is an all original and in beautiful condition except for the fact that it has no sound. i was able to identify a bad rectifier (5u4g) and replaced it. when i applied power my transformer burst into smoke. i know very little about electronics. is it possible the transformer was already bad which caused the rectifier to blow or is it more likely that the new rectifier blew my transformer. either way i need a new transformer. it is a v-4761, where can i locate a replacement.
::::any help would be greatly appreciated.
::::Ron Womack
::::Newman Lake WA
:
Hi Ron
:
: You need to add up currents drawn by the tubes using the schematic.
:
:http://www.nostalgiaair.org/PagesByModel/118/M0024118.pdf
:
: The 5U4 draws 3 amps so it's filament winding needs to be 5 volts @ 3 amps.
:
: All other tubes operate off of 6.3 volts. This radio uses high current tubes for output, 6Y6. Each draws 1.2 amps. Most others draw .3 amps. Lamps draw .25 amps. You would need a winding 6.3 volts @ 6 amps or more.
:
: High voltage is given as 290 volts. Look for a transformer rated 300-0-300 @ 150 ma. It may also be shown 600 volts CT @ 150 ma. or more. You need this high current as a pair of 6Y6's can draw 120 ma.
:
: These are not exact currents. A little higher will be ok but the transformer will be larger. Larger will also run cooler.
:
:Norm
:
::::thanks norm.
::please pardon my ignorance on this subject. How do I pick the correct transformer? I have a schematic for the radio but the only info that i can make out is that it is 290v (i think. it is hard to read). old radio parts. does not seem to have the exact model number. if i have to buy new how do i find out the specifications for this transformer?
::
::Hi Ron
::::
:::: Most likely electrolytic filter caps are shorted. They might have blown the original rectifier? Be sure to replace these caps before powering up with a replacement transformer.
::::
:::: Here is a list of available transformers:
::::
::::http://www.oldradioparts.com/2a23efl.txt
::::
:::: You can also buy from AES, www.tubesandmore.com , Hammond transformers, Radio Daze and others but prices will he higher.
::::
::::Norm
::::
:::::i recently purchased a 1948 westinghouse h 166. it is an all original and in beautiful condition except for the fact that it has no sound. i was able to identify a bad rectifier (5u4g) and replaced it. when i applied power my transformer burst into smoke. i know very little about electronics. is it possible the transformer was already bad which caused the rectifier to blow or is it more likely that the new rectifier blew my transformer. either way i need a new transformer. it is a v-4761, where can i locate a replacement.
:::::any help would be greatly appreciated.
:::::Ron Womack
:::::Newman Lake WA
::
:Ron:
:I know it all seems a bit intimidating...trying to weed through all those transformers listed there...
:And as soon as you find one that's got exactly what you need you think...it seems upon closer inspection that something else is wrong..lol
:Be sure to first identify the style you need.. upright verses horizontal and open or closed frame etc... then measure the mounting holes etc...
:Remember.. you can substitute a different mount if you have the room on the chassis to dril a couple new holes.. y'know?
:So you may need to make some compromises here and there.
:I just went through all this a month or so ago when I went to oldradioparts.com and sorted through that same seemingly confusing list...
:But I bought 3 beauties.. One to fix the current problem and 2 more to keep in stock... after all you do need a $20 min order there and also there are the shipping fees too... so I wanted to justify the whole cost thing and get a few spares for the same effort.
:Good luck
: