Fuse Resistors
- Thread starter rdp10
- Start date
CDFixer
Number 1 USC Trojan Fan
Yeah, we know what the service manual says. Ever wonder why they failed? Not enough headroom on the wattage. Toss in 1/2w they will fit fine. Any time I find a resistor that has opened or increased in value (but not burned up) I increase the wattage if there is room for the larger resistor. As these units age there is a somewhat larger current draw on all the circuits.
In fact some of the later driver boards had 1/2w resistors installed at the factory, but there was no change in the service or parts manual.
In fact some of the later driver boards had 1/2w resistors installed at the factory, but there was no change in the service or parts manual.
couch-flyer
Never tasted lutefisk
EW & CD,
Thanks for the info.
Cheers
Thanks for the info.
Cheers
CDFixer
Number 1 USC Trojan Fan
Fuse resistors are special dual function resistors that function as a resistor and also as a fuse. Fuse resistors are relatively hard to find. I replace all the failed resistors with flameproof film resistors. The fuse resistors are designed to fail if there is excessive current draw and then they fuse open which prevents the resistor from burning and possibly catching on fire. The flameproof film resistors provide basically the same protection. They may take a little longer to fail but they will not burn or catch fire.
couch-flyer
Never tasted lutefisk
EchoWars
CDFixer
:
couch-flyer
Never tasted lutefisk
EW,
Where can I find a .33 ohm 5w ceramic resistor and a 1.2 k ohm 1/2 watt resistor?
Thanks
Where can I find a .33 ohm 5w ceramic resistor and a 1.2 k ohm 1/2 watt resistor?
Thanks
The 1.2K 1/2W you should be able to find about anywhere... Piece of cake....standard value resistor.
The .33 ohm one could be tricky. What is it for? If it needs to be non-inductive, you are a little limited. Michael Percy sells Mills non-inductive resistors in that value...but kinda spendy if that's all you need...
The .33 ohm one could be tricky. What is it for? If it needs to be non-inductive, you are a little limited. Michael Percy sells Mills non-inductive resistors in that value...but kinda spendy if that's all you need...
gonzothegreat
Super Member
Are you sure they are 1/4? Half-watters are available at MCM Electronics ($2.29 for a bag of 20)
Items 370-4.7, 370-10, 370-22
No 390 ohm though. Just 330 and 470.
As for replacing them with standard "smokable" resistors, that would be bad IMHO. Replacing them with flameproof ones, doubly so. I don't have the experience EW does so maybe I'm full of it. Having said that, I don't like negating any protection no matter how minimal.
I still remember on my first receiver (Sony STR-V45) the original owner manually pinned the output relay closed with a toothpick because the bias was so far off. ARGH!
couch-flyer
Never tasted lutefisk
.33 ohm 5w ceramic resistor
The .33 ohm 5w ceramic resistor is a resistor, 2 wire used for a left channel driver amp board. It was replaced w/a .27 ohm 5w. The left one is the wrong size.
The .33 ohm 5w ceramic resistor is a resistor, 2 wire used for a left channel driver amp board. It was replaced w/a .27 ohm 5w. The left one is the wrong size.
