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You mean every BASS guitar amp I think?
Plenty of valved bass amps. Most famous I guess is the Ampeg SVT? never seen one but I HAVE lifted the Bstar 200 watter* and that effer is heavy enough!
Does that give you aclue as to why peeps want sstate??? Then, bass need lots of power, 100W is almost a "practice" amp and past 100W valves do get bloody heavy and bloody expensive both to buy and maintain (4 KT88s 300quid?) .
*Can be used in extremis for bass.
Dave.
edit having said that the only difference between the bass & guitar channels in a Selmer Treble'nBass 50 is that the preamp stage of one goes through a 0.47 cap and the other through a 0.22 before reaching the phase splitter.
Seriously: If you value it, take/fetch it yourself
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The four KT88 put out about 245w and is way louder than my 900w ss amps!
I’m so bored I might as well be listening to Pink Floyd
http://www.talkbass.com/threads/fs-ft-mesa-boogie-bass-400.523411/
I’m so bored I might as well be listening to Pink Floyd
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I’m so bored I might as well be listening to Pink Floyd
Hi Frets,
Re the fan noise. The next time you have the amp serviced you could have a "normally open" heat switch fitted to the fan. One that closes at about 50C. That is a bit oversafe and would probably cut in anyway after an hour or so even just noodlng but better save than,,,eh?
Could be a useful mod to anyone who has a fan cooled amp and needs a quiet background, recording say.
Dave.
http://www.rapidonline.com/electronic-components/auto-reset-thermal-switches-35569
Why ca't I insert that link as an edit?
Dave.
It's surprising the difference even a slow-running fan makes to heat build-up, unless the enclosure is really closed up. I admit those Boogie 400s - and other rack-mount amps - are likely to be a problem, but in general well-designed valve gear shouldn't need cooling much beyond normal convection anyway.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I understand and expected your concern but the thermal switches I had in mind are the type fitted in microwave ovens as a safety device and are extremely reliable, probably have a MTBF 100 times better than the fan which why they are fitted, to backup the fan when it gets crapped up and stops!
If makers were that concerned about heat they would fit an N/C type to mains in!
Dave.
Note, If you ever have one trip out in your MWO there are two types.
Those that reset at just below trip temp and others that need to be cooled below 0 C. A can of freezer can save you an expensive trip to the white goods man!
But clean the bloody fan as well!
Dave.