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looking for source for high frequency resistor 1.54k 1/2w sx1250

J

JeffGUYTON

New Member
I'm in the middle of recapping my sx1250 and broke r14 off awf-021. I've spent hours looking for a
replacement and am coming up with nothing. Anyone with any input would be much appreciated.
The only thing i'm coming up with is buying a used board on ebay...
 
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This is a high frequency resistor on the phono board. I'm assuming a regular resistor would induce noise.
I don't have a lot of electronics knowledge which is the reason for the post...
 
If you are referring to the "RF" stamped on the resistor, it doesn't stand for Radio Frequency.

The "R" is the temperature coefficient which in this case is +/-100 ppm/deg C and "F" designates 1% tolerance . The resistor type is a precision square metal film resistor. So, the resistor suggested by @kevzep should equal or exceed the performance of the original.

If you prefer Digikey, here is a second option:

https://www.digikey.com/product-detail/en/vishay-dale/CMF551K5400FHEB/CMF1.54KHFCT-ND/1555025
 
Wait a minute, that Digikey option, if you send them a check with order (plus your local sales tax) they will ship it to US and Canadian customers on their dime. Of course, you have to fork out for a stamp and use snail mail...which to me is as quick or quicker than the lowest shipping cost from mouser. I do use both, some prices make this necessary.
 
It says in the parts list that it is a metal film resistor. Obviously back in the day metal films weren't common and obviously came in different packaging.
You could also use a precision 0.1% tolerance resistor if you wanted to. It seems that the resistor is somewhat necessary to be right on value for this part of the circuit.
 
All metal film are not the same, there is thin and thick film types. I think it is a thin film resistor. Thin film are lower noise precision types.
594-MRS251.54K1%TR = non-stocked
maybe digi-key, nothing in leaded
do you really need a thin film? well Pioneer seemed to think so, I think you can get away with a low noise thick film or you can use 2, 1/4W thin film in series to make a 1K54 ohm R. (1.5K + 40.2)
It might not have to be 1/2W, maybe that is all they could get in thin film at the time, it is in the feedback network, I do not think it dissipates that kind of power.
https://www.mouser.ca/Passive-Compo...z45?P=1yzbpodZ1z0wl5bZ1z0wkq1Z1yzbppyZ1z0z819

Good luck
 
LesE said:
If you are referring to the "RF" stamped on the resistor, it doesn't stand for Radio Frequency.

The "R" is the temperature coefficient which in this case is +/-100 ppm/deg C and "F" designates 1% tolerance . The resistor type is a precision square metal film resistor. So, the resistor suggested by @kevzep should equal or exceed the performance of the original.

If you prefer Digikey, here is a second option:

https://www.digikey.com/product-detail/en/vishay-dale/CMF551K5400FHEB/CMF1.54KHFCT-ND/1555025
Click to expand...
Thanks everyone for the education. I've ordered the digikey one and will post after I install it. Hopefully this thread will help others who run into the same thing. Marry Christmas...
 
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