Bumped into my variac and ran enough voltage into my old RCA stereo to fry the power transformer. The sizzled unit has secondaries of 580 VTC, 6.3 volts and 5 volts. I have located one with 570VTC, two 6.3 volt taps and one 5 volt. My questions are whether the (small?) difference would matter and also what does VTC mean? Thank you.

:Bumped into my variac and ran enough voltage into my old RCA stereo to fry the power transformer. The sizzled unit has secondaries of 580 VTC, 6.3 volts and 5 volts. I have located one with 570VTC, two 6.3 volt taps and one 5 volt. My questions are whether the (small?) difference would matter and also what does VTC mean? Thank you.
:
Hi Robin, VTC or VCT means voltage center tapped. 580 volts would be read through the two outer taps and would be 1/2 of that to the center tap from each side 290 volts. That little bit of difference 580 to 570 should be fine and cause no problems. It will probably run a little higher with the modern voltages. Best 2 U, George T

::Bumped into my variac and ran enough voltage into my old RCA stereo to fry the power transformer. The sizzled unit has secondaries of 580 VTC, 6.3 volts and 5 volts. I have located one with 570VTC, two 6.3 volt taps and one 5 volt. My questions are whether the (small?) difference would matter and also what does VTC mean? Thank you.
::
:Hi Robin, VTC or VCT means voltage center tapped. 580 volts would be read through the two outer taps and would be 1/2 of that to the center tap from each side 290 volts. That little bit of difference 580 to 570 should be fine and cause no problems. It will probably run a little higher with the modern voltages. Best 2 U, George T

You might want to parallel those 6.3 Volt windings, but be sure that they are in phase.
Lewis
:

Hi

Current rating is important. Be sure replacement transformer has as much iron as the original if you aren't sure of current ratings. Too small of a transformer will overheat.

Norm

:::Bumped into my variac and ran enough voltage into my old RCA stereo to fry the power transformer. The sizzled unit has secondaries of 580 VTC, 6.3 volts and 5 volts. I have located one with 570VTC, two 6.3 volt taps and one 5 volt. My questions are whether the (small?) difference would matter and also what does VTC mean? Thank you.
:::
::Hi Robin, VTC or VCT means voltage center tapped. 580 volts would be read through the two outer taps and would be 1/2 of that to the center tap from each side 290 volts. That little bit of difference 580 to 570 should be fine and cause no problems. It will probably run a little higher with the modern voltages. Best 2 U, George T
:
:
:You might want to parallel those 6.3 Volt windings, but be sure that they are in phase.
:Lewis
::
:
:

Thanks for the replies! As an additional question, what would be an acceptable voltage range for the high voltage secondary? Would something like 550 to 600 be safe? I really like this old console!

You can insert a series power resistor after the rectifier, to knock down the voltage if it is higher than spec, as long as you don't exceed the rectifier tube's rated voltage.

As has already been pointed out, the main concern is that the replacement transformer is able to meet the set's current demands without overheating. The largest load will be the tube heaters.

I wouldn't be afraid to go with a transformer that is a little undervoltage on B+, either. It really won't matter much. Would matter even less if you replaced the rectifier tube with silicon diodes.