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#1
12-03-2021, 06:19 PM
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Question about tube amp biasing.
Hey guys, I've had my Strauss SVT tube amp for a while now and while it's still going perfectly fine and the tubes are good but I have a question about the whole bias thing....
If I change my tubes but use the exact same types for both power and pre-amp will I need to get it biased? as opposed to if i went with a completely different brand to the tubes that are in it now?
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#3
12-04-2021, 05:23 AM
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You may very well need to bias them. You should also look into matched output power tubes. Note that some people like to run the bias a little cold, others a little hot (which may wear your tubes out a little prematurely). I'd go with the manufacturer's recommendation.
It may depend on your amp but biasing is easy (and there are also amps that are 'self-biasing'). I've done it before on my Marshall JCM2000. Here's a very quick video I just found. Skip ahead to the 1:50 mark. You'll need a multimeter.
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#4
12-04-2021, 07:38 AM
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You definitely want a matched set, but even with a matched set of tubes, you would want to have the bias checked unless it's a Class A cathode biased amp.
Those don't need to be biased, but any class A/B tube amp probably does
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#5
12-05-2021, 07:32 AM
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Preamp tubes, no. Just swap with the same type. Power tubes, possibly. Depends on the bias scheme used in the amp. Some are not adjustable, and some are.
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"You don't have to be great to start, but you have to start to be great." -Zig Ziglar Acoustics 2013 Guild F30 Standard 2012 Yamaha LL16 2007 Seagull S12 1991 Yairi DY 50 Electrics Epiphone Les Paul Standard Fender Am. Standard Telecaster Gibson ES-335 Gibson Firebird
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