Resistor substitute philco 48-200

6/1/2009 3:41:12 AMVinny

Greetings to all.
I have a philco 48-200 with a 130 ohm 20% resistor off the output tube that is out of tolerance. My problem is that I am unable to locate a 130 ohm resistor. I do have a 120 and a 150 ohm resistor with a 5% tolerance.
Is it better to go under with the 120 or over with the 150? Both fall within the 20% range error. The new resistors have a gold band.
Thank you,
Vinny A.

6/1/2009 9:12:18 AMi would use the 120 personally

:Greetings to all.
:I have a philco 48-200 with a 130 ohm 20% resistor off the output tube that is out of tolerance. My problem is that I am unable to locate a 130 ohm resistor. I do have a 120 and a 150 ohm resistor with a 5% tolerance.
:Is it better to go under with the 120 or over with the 150? Both fall within the 20% range error. The new resistors have a gold band.
:Thank you,
:Vinny A.
:
:
:

6/1/2009 3:31:13 PMVinny

Correction:
The 130 ohm in radio is 10% tolerance and measures above 165 ohms. The new 120 and 150 ohm are at 5%.
Thank you,
Vinny

:Greetings to all.
:I have a philco 48-200 with a 130 ohm 20% resistor off the output tube that is out of tolerance. My problem is that I am unable to locate a 130 ohm resistor. I do have a 120 and a 150 ohm resistor with a 5% tolerance.
:Is it better to go under with the 120 or over with the 150? Both fall within the 20% range error. The new resistors have a gold band.
:Thank you,
:Vinny A.
:
:
:

6/1/2009 3:35:09 PMWarren

The 120 at 5% Is just fine Vinny, as long as it's the same wattage or better.

6/1/2009 4:58:47 PMVinny

Warren, thank you for your time and expertise in responding. I was also considering leaving well enough alone. The original resistor measured 165 ohms, well out of tolerance, however I will try the 120 and see.
Thanks again,
Vinny A.

6/1/2009 5:55:04 PMNorm Leal

Hi Vinny

The 130 ohm resistor is in series with cathode of 50L6 output tube. There is 5 volts across the resistor and it dissipates .2 watts. If replaced use a 1 watt resistor. 1/2 watt will work but it will get warm.

You will not notice a difference replacing this resistor. A lower value will just cause the tube to operate hotter by reducing grid bias.

http://www.nostalgiaair.org/PagesByModel/627/M0013627.pdf

Norm

:Warren, thank you for your time and expertise in responding. I was also considering leaving well enough alone. The original resistor measured 165 ohms, well out of tolerance, however I will try the 120 and see.
:Thanks again,
:Vinny A.

6/1/2009 11:52:35 PMVinny

Norm, nicely explained, it caused me to do some research. The radio worked like a charm and it sounds great. As usual Norm, thank you so much.
Vinny A.

:Hi Vinny
:
: The 130 ohm resistor is in series with cathode of 50L6 output tube. There is 5 volts across the resistor and it dissipates .2 watts. If replaced use a 1 watt resistor. 1/2 watt will work but it will get warm.
:
: You will not notice a difference replacing this resistor. A lower value will just cause the tube to operate hotter by reducing grid bias.
:
:http://www.nostalgiaair.org/PagesByModel/627/M0013627.pdf
:
:Norm
:
::Warren, thank you for your time and expertise in responding. I was also considering leaving well enough alone. The original resistor measured 165 ohms, well out of tolerance, however I will try the 120 and see.
::Thanks again,
::Vinny A.