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 Post subject: TubeAmp Care
PostPosted: Sun Feb 22, 2009 3:46 am 
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Dude
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Joined: Tue Feb 17, 2009 2:11 am
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Location: Ypsilanti
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Anyone know the rules of warming up/cooling down your tube amp?
I was also wondering the consequences of treating one carelessly...

I have had two, one was borrowed from my neighbor and i think he sold it after i gave it back to him #-o
(this was a looooong time ago)
Image

and another which i bought and its pots make a lot of noise and there's a nasty static thruout
Image
I'm not sure why...

Maybe someone knows?

js

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 Post subject: Re: TubeAmp Care
PostPosted: Sun Feb 22, 2009 10:59 am 
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Robbie The Botkiller
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I couldn't find anything about warming up/cooling down in the user guide so you're not going to break anything while plugging/unplugging. If it's a matter of gain depending on the warming up of the tube, a simple test will tell you how much time it takes for the preamp to reach its operating temperature.

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 Post subject: Re: TubeAmp Care
PostPosted: Sun Feb 22, 2009 12:06 pm 
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Mr. Blues
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Hi,

if you have a tube power amp, give it some time to warm up. After some minutes it will sound better.
With preamp tubes you will hear no differences.

Tubes are pretty solid when they cooled down, but must be handled with care when they are fired up. Better to let them cool down before you throw them around.

Andreas

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 Post subject: Re: TubeAmp Care
PostPosted: Mon Feb 23, 2009 12:23 am 
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Dude
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right its sort of like a lightbulb....

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 Post subject: Re: TubeAmp Care
PostPosted: Thu Apr 16, 2009 5:19 am 
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Tenderfoot

Joined: Thu Feb 07, 2008 8:22 pm
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Machine type: AW1600
I let mine warm up for a few minutes before I turn on the phantom power supply. When I turn it off, I turn off the phantom power first and wait a few seconds before I power down the preamp.

Bill

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 Post subject: Re: TubeAmp Care
PostPosted: Thu Apr 16, 2009 7:10 am 
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Footswitch Genius
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static noise from pots is an indication of faulty pots, not the valve

valves are sensitive to shock and don't like rough handling - there is a couple of mica spacers in each valve that hold the various parts at the correct distances from both each other and from the glass envelope that contains them. repeated shocks can wear down these mica spacers and let the parts move around slightly inside, and make a noise whenever the valve is touched. they can also pick up vibrations from outside, i.e. like from your power amp. when a valve is like this they are said to be 'microphonic' and should be replaced.

a microphonic valve can sometimes sound a little like a 'bad room' as the valve resonates with some frequencies and not with others

dead filaments are obvious; if there's no red glow then the filament is dead and the valve needs replacing

a blue glow (usually seen in just a couple of small sections of the valve) indicates that the valve is in the latter stage of its life, and soon needs replacing

little 12AX7 and similar valves (like those used in preamps) carry much less load and so last much longer than their big power-amp brothers

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 Post subject: Re: TubeAmp Care
PostPosted: Thu Apr 16, 2009 7:13 am 
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Dude
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awesome info, thanks

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 Post subject: Re: TubeAmp Care
PostPosted: Thu Apr 16, 2009 11:56 am 
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Tinhorn

Joined: Mon Mar 17, 2008 12:50 am
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Hi,
tubes in mini preamps like ART and DBX work at low voltage. They don't need that much care like big brother tubes in high voltage amps/preamps and will last much longer.


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 Post subject: Re: TubeAmp Care
PostPosted: Thu Apr 16, 2009 5:37 pm 
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No More Coasters!
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I have a couple of ART tube pre's, like in the picture. I haven't babied them in any way. They are often tossed in bags, and toted around in a bag filled with cables and other odds and ends. They must be pretty robust in design, because they've worked very well for me for the last 6 or 7 years.


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 Post subject: Re: TubeAmp Care
PostPosted: Tue Apr 21, 2009 3:53 am 
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Wants You
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Location: Hamilton Square, NJ
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I've had one like the first one since back in my cassette multi-tracker days. I still like it for DI'ing the bass. :thumbup:


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 Post subject: Re: TubeAmp Care
PostPosted: Tue Apr 21, 2009 7:03 pm 
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Tenderfoot

Joined: Thu Feb 07, 2008 8:22 pm
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Location: New Hampshire
Favourite food: Peking duck
Machine type: AW1600
I turn on the phantom power after the tube amp is fully warmed up, and shut off the phantom power 10 seconds before shutting off the amp, in order to baby my microphones.

Bill

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