fast acting or slow-blow fuse for amp?

  • Thread starter Thread starter FALKEN
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FALKEN

FALKEN

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should you use a fast-acting or a slow-blow fuse for a marshall head?
 
yes.....




the power one is a slow...
the speaker protedt is a quick...
 
if you must ask...don't worry about it
just sell your marshall....(kindding)
 
An amp with a blown fuse should have about $437.56 knocked off it's value...in my opinion, so how much would you like? :eek: :D :D
 
sorry I meant in the fuses. I know the names seem self explanatory but anything I don't know I try to learn.
 
since you all seem knowledgeable about marshalls tho I did have another question. Will the amp distort more pushing a higher number of ohms? The amp is selectable and I was going to go for a new cab with greenbacks in it, it seems I might be able to get a 4,8,or 16 ohm setup. I was hoping to minimize the breakup so I was thinking a 4 ohm cab might do the trick. ?
 
if your looking to minimize breakup, don't get greenbacks. :D they sound sweet but one of their qualities is early breakup.

i don't think the impedance will have any major effect on breakup.
 
true. But I think with a 100 ohm cab and a 50 watt head I'm probably good, no?
 
:eek:
FALKEN said:
true. But I think with a 100 ohm cab and a 50 watt head I'm probably good, no?
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:eek: :eek: :eek:

whoa dude... first.... this is a tube amp???? if so there's a transformer on the output.... the tranny "likes to see" a specific impedence... typically 8 ohms... this os discribed in terms like transfer function and shit like that... now you can go up a little without too much problem but going down is asking for problems.... but you really should stick with the reccomended impedence...

in the case of a solidstate output the rules change quite a bit... reguardless of what the back of the amp says you can hang any resistance you want on it... though going too low (below 4 ohms) is a problem for most power supplys and it can wreek havoc... in fact the higher the impedence the happier the amp will be... (less current required)... but i suspect 100 ohms is a bit of a stretch....

or did you mean WATTS???? :cool:
 
yeah I meant watts. silly typo. I was talking about speaker breakup with a 100 watt cab and a 50 watt head probably wont be as big of an issue as if I was using a superlead or something.
 
if you want less breakup, look into different speakers.
 
look for a heavier speaker... JBL/EV... dont know much about them personally but have heard good things about webers...
 
ted weber would be a good guy to talk to about your speaker needs.
 
FALKEN said:
yeah I meant watts. silly typo. I was talking about speaker breakup with a 100 watt cab and a 50 watt head probably wont be as big of an issue as if I was using a superlead or something.
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But as far as keeping the equipment from self-destructing, and as long as the impedance matches, yes, a 50 watt head into a 100 watt cab is good. As a matter of fact, since tube amps actually put out more than their rated wattage when they are driven into distortion, having your speakers rated 2X higher than the amp is a good idea, IMO.
 
so I put the slow blow in and it instantly blew right through it!

Here is what the back of the amp says:

MAINS FUSE:
T2A 230V
T3.15A 120V

I tried the 2A fuse which blew immediately. Then I read the back of the amp and saw it said 3.15A for American power so I went and got those and still it blew immediately. I sort of had the feeling it might because the fuse I pulled out of the amp had a much thicker wick than the one I put in. I'm not sure where to get the "thick" ones...I just grabbed what they had at radio shack.. any help here???
 
FALKEN said:
I tried the 2A fuse which blew immediately. Then I read the back of the amp and saw it said 3.15A for American power so I went and got those and still it blew immediately.
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Something's very wrong. Take it a qualified repair person.
 
arrgh! there are "repair" people around here but they are hardly "qualified" !
 
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