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rca: wattage of bias resistors in RCA K105

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » rca: wattage of bias resistors in RCA K105
           
Gary Streeter
 
 
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15.Jun.17 18:47

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Does anyone have information or ideas or recommendations for what watt the biasing resistors in this RCA K105 might typically use?  The schematic shows the ohms but not the watts.  Can anyone help?  Thank you.

Gary

Paul Reid
 
 
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19.Jun.17 02:49

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P = V^2/R

Voltages can be squinted from rca_k105_sch.pdf (not rca_k105_sch1.pdf)

Bias voltage not there(?) but can be guessed from book data.

R19 3,000r 153V: 7.8W (use 15W or 20W)

R20 2,500r 92V: 3.4W (use 7W or 10W)

R21 10r 1.5V: 0.225W (use 1/2W)

R22 170r 24.5V: 3.6W (use 7W or 10W)

This article was edited 19.Jun.17 03:01 by Paul Reid .

Gary Streeter
 
 
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21.Jun.17 21:07

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Thank you!  This will be helpful.  The schematic we have does not show any values for wattage, and it's been guesswork!

  
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