A device controlling electric current through a vacuum in a sealed bulb, usually made from glass. Vacuum tubes are now less common, but they are used in high end guitar, bass and some other amplifiers.

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3
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3answers
87 views

1 of 4 power tubes went bad; buy a matching quartet or replace the one?

I have a Peavey Windsor running Ruby EL34B-STR's. One of the power tubes went bad. I can order another Ruby EL34BSTR and re-bias the amp (idk if it has a bias for each tube or not) and I assume ...
1
vote
0answers
44 views

Preamp Valve gone in 'hissing' amp?

Roughly 3 years ago, I purchased a VHT Special 6 Ultra (Combo) Valve Amp. It has recently been 'hissing' (not sure if this is the correct description), and this noise increases with higher wattage and ...
5
votes
3answers
4k views

How to buy the “right” power attenuator for a tube amplifier?

I want to get a tube amplifier, but the tube amplifiers I fancy are generally at least 22W. I live in an apartment with thin walls, so I have to get it down to conversation/TV volume. This brings me ...
11
votes
3answers
3k views

Tradeoff between powering off and leaving tube amplifier on during breaks

Life span of a tubes(both pre-amp and power-amp tubes) depends on amp "usage" And/Or how often you turn on and turn off your amp. But I need some clarification definition on the word "usage" Because ...
6
votes
5answers
10k views

What's the best choice to get more gain out of a tube amplifier

The story behind this question: I got myself a nice little combo for my bedroom-workouts (related to playing guitar, of course :D ), a Blackstar HT1-R which is a lovely little 1 watt 2 channel ...
18
votes
4answers
2k views

When should I be concerned about calibrating the bias of vacuum tubes in an amplifier?

I think it would be useful to discuss the concept of bias as it pertains to guitar amplifiers. I have read some articles saying that you should always rebias your amplifier when you change the power ...
13
votes
2answers
5k views

What do the different tubes in an amplifier do?

Preamp vs Phase Inverter vs Reverb vs Power vs Rectifier. Many people get really, really confused when they try to understand anything about tubes. I spent a very long time myself trying to ...
27
votes
7answers
64k views

How do I know when it's time to change a tube on my amplifier?

I think this would be a wonderfully instructive question to people who are new to tube amplifiers. In short, how do I know that it's time to change a tube, and what's a good strategy for figuring out ...
24
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7answers
5k views

Why do tube-based guitar amplifiers sound so good?

Is it just a cultural thing ("they've always sounded that way") or is there some basis in music theory for this?