"Fusible" cathode resistor

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I was reading below about the difficulties of getting non-inductance cathode resistor. I have a related but different problem.

I recently purchased a Sonic Frontier Power 3 amplifier (each with 4 pairs of 6550). The amp use fixed biased circuitry.

Few nights ago, Two of the cathode resistor for the 6550 output tubes (4.7 Ohm in value) suddenly burnt off. Parts Connexion advised to use 1w 'fusible' resistor or 0.5W normal resistor.

I thought the power handling of these resistors are too low.

But on the other hand, I think these resistors are designed to be burnt off so that other components such as the output transformer, power transformer are protected from burning off, should the output tube draws too much current.

So which side of the argument is correct ?
Alan

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Topic - "Fusible" cathode resistor - akltam 02:02:06 01/31/16 (4)

RE: "Fusible" cathode resistor - Triode_Kingdom 09:17:18 01/31/16 (0)

RE: "Fusible" cathode resistor - FenderLover 02:29:31 01/31/16 (2)

RE: "Fusible" cathode resistor - akltam 05:10:11 01/31/16 (1)

RE: "Fusible" cathode resistor - Alpha Al 12:55:07 02/01/16 (0)

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