Audiophile fuses for my 911mk3 ? ...

[Tremayne]

[QUOTE=Glisse;269611]

I am not aware of anyone other than Colin having an issue with blowing fuses in a 911.

QUOTE]

OK, let’s get the embarrassing bit out of the way. I took the value from the owner’s manual and ordered the T 3.15 amp fuses. The manual was wrong; the value should have been T 6.3 amps. I didn’t check the fuse value of the ones I took out, I just believed the manual value. In hindsight it seems to be a very obvious thing to do, but I didn’t do it. The 911mk3 is back up and running with the original T 6.3 amp fuses. Burmester didn't tell me to double the value, they told me that I had installed the wrong fuses, and emailed me an up to date manual.

[joeinid]

Thank goodness. You almost made me cancel my mono blocks NOT!

So you made a little mistake. No problem. I actually checked the fuses in there before I ordered them because my manual was not handy. Boy was I lucky

So Colin,

What's with the 16 amp fuses? Is that a typo or ???

[Glisse]

Colin, I have done exactly what you did - looked at the fuse value listed in the owner manual, and ordered the T3.15 that were listed.

I didn't bother checking the fuses before ordering, either. I just checked now - T6.3, just as yours are. I suspect I will blow the AC line before these go.

However, I did open up the 911, and there is a secondary fuse in the power supply, which may be part of a protection circuit.

Joe, I am not sure I would trust anything written in the manual. I'd wait to see what they put in your pair, and then replace them with the same value.

[joeinid]

Originally Posted by Glisse

Colin, I have done exactly what you did - looked at the fuse value listed in the owner manual, and ordered the T3.15 that were listed.

I didn't bother checking the fuses before ordering, either. I just checked now - T6.3, just as yours are. I suspect I will blow the AC line before these go.

However, I did open up the 911, and there is a secondary fuse in the power supply, which may be part of a protection circuit.

Joe, I am not sure I would trust anything written in the manual. I'd wait to see what they put in your pair, and then replace them with the same value.

Hi Glisse,

I had pulled out the 2 fuses in the back, looked up what they were (6.3A Slow Blow) and just ordered the HiFi Supreme fuses in the same value. Played around with orientation and determined the best way and left them like that. No issues, just sweet music. The stereo 911mk3 is out of my hands now and I just left the Supreme fuses in there. I have not bothered to swap fuses on the Dartzeel (yet).

I'll just go with the AMR fuses Jeff @ AV Solutions sells for the 911mk3 mono blocks when they arrive in a couple of months.

[Tremayne]

So Colin,

What's with the 16 amp fuses? Is that a typo or ???[/QUOTE]

Hi Joe,

No, I don't believe that it is a typo; I had an email from Burmester confirming the value as 16 amps.

I think that there is probably a lot more to calculating the fuse value than simply applying Ohm's Law.

My (under sized) fuses didn't blow when playing the system at excessive levels, they blew at switch on.

If Burmester (and I believe everything they say, even the manual ) have calculated that the 911mk3 is fully protected with a T 16 amp fuse, what would you hope to gain by changing it to one with a lesser value?

Remember, we are talking about Burmester, their engineering, even over-engineering, is superb. They don't build to the lowest possible limits, and that extends to the electronics as well.

Over here in the UK, with our so called standardised Euro voltage of 230, the 911mk3s fuses are designed to blow at 265 volts. I don't believe that the 948 not being fitted with surge protection is an oversight, Burmester products are designed to go on working well beyond normal limits.

All you would achieve by reducing the fuse values would be the possibility of stopping your amp. from working, and having to replace fuses when it was working within its design limits. Those limits may be well outside those of other products, but the T 16 amp fuse is there to protect the 911mk3 nothing more. It would also reduce some of the Burmester engineering to that of lesser products (No I don't work for them, just getting a bit carried away).

So, Joe IF your new 911mk3s do come with T 16 amp fuses don't be concerned, in fact don't even look. Just plug them in and enjoy

[Tremayne]

Originally Posted by Glisse

Colin, I have done exactly what you did - looked at the fuse value listed in the owner manual, and ordered the T3.15 that were listed.

I didn't bother checking the fuses before ordering, either. I just checked now - T6.3, just as yours are. I suspect I will blow the AC line before these go.

However, I did open up the 911, and there is a secondary fuse in the power supply, which may be part of a protection circuit.

Joe, I am not sure I would trust anything written in the manual. I'd wait to see what they put in your pair, and then replace them with the same value.

Hi Glisse,

I happy that my misfortune had at least one positive outcome, I hope that you can return them in exchange for the correct value fuses.

That's interesting about the internal fuse, I wasn't aware that it existed. What size is it? Do we need to start a new thread?

[Glisse]

Originally Posted by Tremayne

Hi Glisse,

I happy that my misfortune had at least one positive outcome, I hope that you can return them in exchange for the correct value fuses.

That's interesting about the internal fuse, I wasn't aware that it existed. What size is it? Do we need to start a new thread?

Hi Colin,

It is 125mA, and sits just above the small 15v pc mount transformer. It's either the circuitry for the front solenoid switch and LEDs, or a relay based protection circuit. I can't tell. But I'm not going to swap this one out, LOL.

The T3.15A are pretty common in 230VAC equipment, so they will find a (less deserving) home in some of my other equipment.

[Masterlu]

Originally Posted by Glisse

Hi Colin,

It is 125mA, and sits just above the small 15v pc mount transformer. It's either the circuitry for the front solenoid switch and LEDs, or a relay based protection circuit. I can't tell. But I'm not going to swap this one out, LOL.

The T3.15A are pretty common in 230VAC equipment, so they will find a (less deserving) home in some of my other equipment.

That's for the late payment power interrupter circuit.

[Glisse]

Originally Posted by Masterlu

That's for the late payment power interrupter circuit.

I'll be putting a 16A in there right away

[Tremayne]

Hi Joe,

I'm not an electrician (but you've already realized that, and I have no knowledge of the U.S. system), so if anything I say is incorrect, I apologise, however, this is how I see it.

IF Burmester had instructed me to up the fuse rating of my 911mk3 to 8amp then I would not have had any problem with that. I have been very puzzled as to why you have such big concerns with, possibly, using the U.S. equivalent of 16 amp. Re-reading through the posts I have realized the significance of something that I had previously overlooked.

Originally Posted by joeinid

Hi Colin,

I use a PurePower 2000 which maintains 120V at all times. Works perfectly. I am NOT putting two 16 amp fuses in my amp. That is ludicrous. I'm only hooked up to a 15 amp circuit and two 16 amp fuses in my amp would be insane. I might as well wrap tin foil around them and forget about it (kids do not try this at home).

A 15 amp circuit seems to me to be extremely small; that would be the equivalent of me plugging my system into a 7.5 amp circuit. To put that into context; the smallest circuits that I have are the 16 amp lighting circuits and I wouldn't dream of plugging anything other than a light bulb into those. The Hi-Fi circuit has the normal ring main socket protection of 32 amp.

Joe, I now more fully understand your concerns, but I really feel that those concerns are possibly misdirected. Instead of trying to make the electronics fit the circuit, would it be possible for you to investigate upgrading your circuit to one that will comfortably and safely cope with the power demands of your system? especially now that you have two 911mk3s on the way. I find the thought of you plugging all of that equipment into a 15 amp circuit quite frightening.