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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: "Fusible" cathode resistor posted by akltam on January 31, 2016 at 02:02:06:
I would NOT substitute those resistors. You didn't say what their power rating is, but even a 1/2W 4.7 Ohm resistor should be able to handle several hundred mA. Do you have a schematic for the amps? You need to determine WHY the resistors burned before you do anything else. Generally speaking, the first thing to do is remove the output tubes and determine whether that amp has normal bias voltages. Next, the tubes need to be individually tested under load. An alternative to that might be to install them in the amp and operate it at reduced line voltage using a Variac. However, that might also reduce bias voltage, so an external bias supply might be required for this test. If you're not a tech and/or don't have access to test equipment, it's time to have a professional evaluate the amp.
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- RE: "Fusible" cathode resistor - Triode_Kingdom 09:17:18 01/31/16 (0)
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