I need to replace a 450 Ohm 1 watt flexible resistor (R-11) in a GE model A-53 tombstone. I have been unable to find a source for flexible resistors. Can I substitute it a 470 Ohm 1 watt carbon composition resistor? Will this affect the performance of the radio?

Hi Thomas

You can use a 470 ohm @ 2 watt carbon resistor. This resistor is used in series with cathode of a 6F6 output tube. This resistor dissipates around 1 watt.

Look for 470 ohms rather than 450. 450 is no longer a standard value.

Norm

:I need to replace a 450 Ohm 1 watt flexible resistor (R-11) in a GE model A-53 tombstone. I have been unable to find a source for flexible resistors. Can I substitute it a 470 Ohm 1 watt carbon composition resistor? Will this affect the performance of the radio?

What is a flexible resistor? I have an A-53 that's next up on my work bench. It would be nice to know what this item is before I start the restoration.

A flex-resistor is a wire wound resistor that has the resistance wire wound around either fiber glass or asbestos. It is then covered with a cloth or fiber glass sleeve. The ends of the sleeve usually have the lead wires spiraled around them to hold them down and also connect to the resistance wire inside. Often flex resistors will have color coding on them like any other resistor.

Thomas

:A flex-resistor is a wire wound resistor that has the resistance wire wound around either fiber glass or asbestos. It is then covered with a cloth or fiber glass sleeve. The ends of the sleeve usually have the lead wires spiraled around them to hold them down and also connect to the resistance wire inside. Often flex resistors will have color coding on them like any other resistor.
:
:Thomas

Thomas:
Thanks for the responce.
Leon

::A flex-resistor is a wire wound resistor that has the resistance wire wound around either fiber glass or asbestos. It is then covered with a cloth or fiber glass sleeve. The ends of the sleeve usually have the lead wires spiraled around them to hold them down and also connect to the resistance wire inside. Often flex resistors will have color coding on them like any other resistor.
::
::Thomas

i have replaced a few of these most recently in a all american mohawk but i never knew they had a name i just thought they were an old type of wire wound res. i was wondering since as you say res. are no longer available in the exact ohm rating, so what is the tolerance some say 20%others say 10% is it better to go a little higher or a little lower.i wounld't think its too critical as i have seen them run fine when most of the res. are way out of tolerence. butch
:
:Thomas:
:Thanks for the responce.
:Leon

As for higher or lower, it all depends on how critical it is in the circuit operation, and a few other design factors. As a current limiting device most of the time, lower resistance means more current, and more resistance means less current. But with a 10 to 20% accuracy of the resistor in the design, and the forgiving nature of tubes, it often boils down to what do you have on hand.

:i have replaced a few of these most recently in a all american mohawk but i never knew they had a name i just thought they were an old type of wire wound res. i was wondering since as you say res. are no longer available in the exact ohm rating, so what is the tolerance some say 20%others say 10% is it better to go a little higher or a little lower.i wounld't think its too critical as i have seen them run fine when most of the res. are way out of tolerence. butch