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Bakelite block condensers
TimC
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#1

04-23-2010, 05:17 PM
Rebuilding bakelite blocks and got one (4989E) with a resistor in it.
What type/wattage resistor will suffice?

Carbon?
Wirewound?

1/4 watt?
1/2 watt?

Thanks and have a good weekend

Tim
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exray
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#2

04-23-2010, 05:23 PM
I think the answer is "yes, any of the above". What model is the radio for further verification of how it applies in the circuit?

-Bill
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TimC
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City: Rochester, NY
#3

04-23-2010, 05:34 PM
Hi Exray
Model 70 (early) inside the grandfather clock (570)

My diagram escapes me (in my mess) right now.
Block has a .09mf cap and a 250 ohm resistor.

Tim
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#4

04-23-2010, 06:51 PM
I used a 1/2 watt 250 ohm in mine . Ihad three of the boogers never could figure what the resisters suppose to do .
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exray
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#5

04-24-2010, 12:06 PM
Doing some quick math, a 1/4 watt is more than ample. Screen current of 1.7ma. P=I^2 x R (.0017 x .0017) x 250. = .0007 watts.

I don't understand why its in the circuit either? Maybe it helps prevent oscillations or something?
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