Re: Head blowing fuses



edrock wrote:

I have a Marshall AVT50 that I just purchased used a few weeks ago.

Purchased new? If so, stop feeding it fuses and take advantage of the warranty.

A
few days ago it blew the main fuse. After replacing it and powering it
up it instantly blew again. Does anyone have any idea what the issue
could be? I was thinking maybe the pre amp tube....

Doubtful.

Also I'm a drummer and don't have all the tech info about ampage and
ohms. I was just wanting to make sure that I wasn't the cause of this.
The head is rated 4 ohms and the cab is 16 ohms. That shouldn't be a
problem right? Thanks, Ed

No. In fact, it should be as bullet-proof as it can be going into 16 ohms (NOTE: this is a solid state amp). Any chance that the speaker cable shorted out?

If it's used, and worth it's to you, take it to a tech. If you have the money, now may be a good time to get a TUBE amp. It sucks that you only got a few weeks use out of it, though.
.



Relevant Pages

  • Re: Amp blowing fuses, HELP
    ... both of my subs are wired in parallel for 2 ohms each. ... I checked the amp, no lights were on, except the neon light outside of it. ... I checked the fuses, and one of them was blown. ...
    (rec.audio.car)
  • Re: No Interconnect is the Best, attenuation and source switch options.
    ... sonically obvious except that both lead to very good sound ... Well yes you could always say the amp with an exotic and perhaps ... Load mismatches are the very worst evil in so many amps I have had to ... constant current density manner with a section of either 4 ohms or 6.6 ...
    (rec.audio.tubes)
  • Re: S-30 Mk III circuit help
    ... The reason is that the load match for the tubes is so very poor. ... so 5 in parallel amounts to 56 ohms. ... the amp will overheat the output tubes. ... simple combination of non linear devices and enormous amounts of NFB, ...
    (rec.audio.tubes)
  • Re: Most Linear Region
    ... Do you have any link to e810F triode curves, or did you plot your own? ... E810F triode tests with 8k load, same Ea Ia as above, gain is stated at ... Ra has to be very much higher than the 940 ohms I figured out ... Here is an amp recipe anyone may make, and find it simple, and find it ...
    (rec.audio.tubes)
  • Re: Tube Amp - Autoformer - Speakers
    ... I recently acquired 4-ohm speakers and re-wired my SE 45 amp to use the ... this autoformer and re-wiring the OPT impedance tap to 8 or 16 ohms? ... Two guys here have such transformers to optimise the load match between ...
    (rec.audio.tubes)