Kindy odd subject line but a friend of mine wants me to install pwr. xmfr in a Silvertone 1591. I have xmfr that does not get hot and 5 v. ok for 5Y3, and 6.3 v. ok for other tubes. BUT schematic says 330 AC v. on 5Y3 plates. I have about 373. Is it ok to go over that much on B+ ?

:Kindy odd subject line but a friend of mine wants me to install pwr. xmfr in a Silvertone 1591. I have xmfr that does not get hot and 5 v. ok for 5Y3, and 6.3 v. ok for other tubes. BUT schematic says 330 AC v. on 5Y3 plates. I have about 373. Is it ok to go over that much on B+ ?
:

That's probably OK, but your B+ will be high. You can drop it down with higher value resistors (and you should probably go with higher wattage also). The main thing to cnsider is the first capacitor after the rectifier; you must not go over it's rated voltage. You can put a resistor before this capacitor if you need it.
Johnnysan-

The AC side is okay. But the rectified voltage should be 220 VDC. A few volts to high is okay. But not way over. As Johnnysan said add a resistor if needed.

Pull all of the tubes except the rectifier from the radio and measure the non-loaded filtered DC. Even with extra resistance the voltage may climb too high for the electrolytics. If that is the case, increase their working voltage.

Depending on the output tube, you might actually benefit from a bit of extra voltage with extra power, if you wish to have extra power. However, be careful of tube ratings, especially if an eye tube is used, as you don't want to wear it out prematurely.

T.

::Kindy odd subject line but a friend of mine wants me to install pwr. xmfr in a Silvertone 1591. I have xmfr that does not get hot and 5 v. ok for 5Y3, and 6.3 v. ok for other tubes. BUT schematic says 330 AC v. on 5Y3 plates. I have about 373. Is it ok to go over that much on B+ ?
::
:
:
:That's probably OK, but your B+ will be high. You can drop it down with higher value resistors (and you should probably go with higher wattage also). The main thing to cnsider is the first capacitor after the rectifier; you must not go over it's rated voltage. You can put a resistor before this capacitor if you need it.
:Johnnysan-
:
:Thanks a lot. Got 1 more xmfr to check out. Then go from there. Will keep u informed
:
:

:::Kindy odd subject line but a friend of mine wants me to install pwr. xmfr in a Silvertone 1591. I have xmfr that does not get hot and 5 v. ok for 5Y3, and 6.3 v. ok for other tubes. BUT schematic says 330 AC v. on 5Y3 plates. I have about 373. Is it ok to go over that much on B+ ?
:::Got pwr xmfr in radio. got all 9 wires connected. now for that dreaded "smoke test"
::
::
::That's probably OK, but your B+ will be high. You can drop it down with higher value resistors (and you should probably go with higher wattage also). The main thing to cnsider is the first capacitor after the rectifier; you must not go over it's rated voltage. You can put a resistor before this capacitor if you need it.
::Johnnysan-
::
::Thanks a lot. Got 1 more xmfr to check out. Then go from there. Will keep u informed
::
::
:
:

The no load voltage will be somewhat reduced when you get it hooked up and working. Likely you will be more or less on target. Agree that you could insert a resistor before the first filter capacitor to get the voltage spot on. Make it at least a 10 watter, and dress it next to the chassis where it can dissipate a little heat. Use Ohm's law to determine the value.

::::Kindy odd subject line but a friend of mine wants me to install pwr. xmfr in a Silvertone 1591. I have xmfr that does not get hot and 5 v. ok for 5Y3, and 6.3 v. ok for other tubes. BUT schematic says 330 AC v. on 5Y3 plates. I have about 373. Is it ok to go over that much on B+ ?
::::Got pwr xmfr in radio. got all 9 wires connected. now for that dreaded "smoke test"
:::
:::
:::That's probably OK, but your B+ will be high. You can drop it down with higher value resistors (and you should probably go with higher wattage also). The main thing to cnsider is the first capacitor after the rectifier; you must not go over it's rated voltage. You can put a resistor before this capacitor if you need it.
:::Johnnysan-
:::
:::Thanks a lot. Got 1 more xmfr to check out. Then go from there. Will keep u informed
:::
:::
::
::
:
:

:The no load voltage will be somewhat reduced when you get it hooked up and working. Likely you will be more or less on target. Agree that you could insert a resistor before the first filter capacitor to get the voltage spot on. Make it at least a 10 watter, and dress it next to the chassis where it can dissipate a little heat. Use Ohm's law to determine the value.
:
:::::Kindy odd subject line but a friend of mine wants me to install pwr. xmfr in a Silvertone 1591. I have xmfr that does not get hot and 5 v. ok for 5Y3, and 6.3 v. ok for other tubes. BUT schematic says 330 AC v. on 5Y3 plates. I have about 373. Is it ok to go over that much on B+ ?
:::::Got pwr xmfr in radio. got all 9 wires connected. now for that dreaded "smoke test"
::::
::::
::::That's probably OK, but your B+ will be high. You can drop it down with higher value resistors (and you should probably go with higher wattage also). The main thing to cnsider is the first capacitor after the rectifier; you must not go over it's rated voltage. You can put a resistor before this capacitor if you need it.
::::Johnnysan-
::::
::::Thanks a lot. Got 1 more xmfr to check out. Then go from there. Will keep u informed
::::
::::
:::
:::
::
::
:
:
I agree with Codefox. Once loaded you may have an exact match for the transformer.

Don't overlook the 6.3 VAC filament, though. An overload on that can shorten the life of the transformer. After it is running, the voltage on the filaments needs to be 6.3 volts. If it is lower, pull a tube. If it gets to 6.3 then you will want to add another 6.3 VAC transformer to help light the tubes.

This could happen, but not lkely.

Best Regards,

Bill Grimm

::The no load voltage will be somewhat reduced when you get it hooked up and working. Likely you will be more or less on target. Agree that you could insert a resistor before the first filter capacitor to get the voltage spot on. Make it at least a 10 watter, and dress it next to the chassis where it can dissipate a little heat. Use Ohm's law to determine the value.
::Pwr xmfr I am about to fire up used 2 other 8 pin octal tubes beside 6F6, and about 4 or 5 7 pin type tubes, such as 6BA6, so I know it can handle the 6.3 v. amperage
::::::Kindy odd subject line but a friend of mine wants me to install pwr. xmfr in a Silvertone 1591. I have xmfr that does not get hot and 5 v. ok for 5Y3, and 6.3 v. ok for other tubes. BUT schematic says 330 AC v. on 5Y3 plates. I have about 373. Is it ok to go over that much on B+ ?
::::::Got pwr xmfr in radio. got all 9 wires connected. now for that dreaded "smoke test"
:::::
:::::
:::::That's probably OK, but your B+ will be high. You can drop it down with higher value resistors (and you should probably go with higher wattage also). The main thing to cnsider is the first capacitor after the rectifier; you must not go over it's rated voltage. You can put a resistor before this capacitor if you need it.
:::::Johnnysan-
:::::
:::::Thanks a lot. Got 1 more xmfr to check out. Then go from there. Will keep u informed
:::::
:::::
::::
::::
:::
:::
::
::
:I agree with Codefox. Once loaded you may have an exact match for the transformer.
:
:Don't overlook the 6.3 VAC filament, though. An overload on that can shorten the life of the transformer. After it is running, the voltage on the filaments needs to be 6.3 volts. If it is lower, pull a tube. If it gets to 6.3 then you will want to add another 6.3 VAC transformer to help light the tubes.
:
:This could happen, but not lkely.
:
:Best Regards,
:
:Bill Grimm
: