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Ultravalve amp with bad tubes

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Kw6

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Ultravalve amp with bad tubes
« on: 26 Nov 2019, 04:52 pm »
I was wondering if the Ultravalve offers any kind of protection against bad tubes. For example if tube blows will it take out some resistors and will need service.
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avahifi

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Re: Ultravalve amp with bad tubes
« Reply #1 on: 27 Nov 2019, 10:55 pm »
The rectifier is protected with a diode pair.  The output tubes rarely fail violently, and worse case they might overheat the 2W 16 ohm bias reference resistors.

It is a very solid design.

Frank
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Kw6

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Re: Ultravalve amp with bad tubes
« Reply #2 on: 28 Nov 2019, 11:08 pm »
Ok thanks Frank! Good to know!😊
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