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In Reply to: RE: fuses posted by DTS ma 7.2 on January 22, 2015 at 09:36:25
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Take one look at the fuse holder, wires and wire spades and you will forget about putting an expensive fuse in there.
You would be better off removing the fuse, fuse holder, wire and spades. As andyr already suggested there are good quality, relatively inexpensive fuse holders available. Since the MMGs use a QR tweeter and not a true ribbon, they will take some abuse and Magnepan will replace them for a reasonable fee. You have a good amp with lots of clean power, I personally would feel comfortable running them without fuses. In fact my MMGs do not have fuses. They are Magnestand modded and that includes eliminating the fuse, holder, wires, spades, etc..
Follow Ups:
Now wait a minute, Maggie's fuse holders and the use of fuses bug people out. But at the same time they are happy using active X-Os whose electronic artifacts will be AMPLIFIED before reaching one's ears, no way I say (and having said so too many time before). Idiots and seniors like myself are known to be forgetful. So often I inadvertently switch into a source set to play at too high a level, and wham-o pop goes some fuse(s). In my default settings, the phono output is much greater than my line level outputs. So very often when comparing a LP to its CD counterpart, in haste I instantaneously switch between the two without making the necessary adjustments and before having adjusted their levels. (I maintain a stock of fast blow 2.5 and 3 amp fuses acquired from the rat shack because I anticipate doing more of the same. IAE it's much simpler and faster to swap fuses than it is for ribbon tweets.) In the pre-CD age I somehow was able to connect to a tape recorder's bias signal (and although being at some ultra-high frequency) I very briefly heard a weird high pitched sound before destroying fuses. All said because one needn't play LOUD to burn fuses.
Regardless of fusing, you could easily attenuate the output of your phono amp to equalize the nominal volume difference. Just a few dollars worth of resistors.
Dave.
"Regardless of fusing, you could easily attenuate the output of your phono amp to equalize the nominal volume difference. Just a few dollars worth of resistors."
Also including the use of a little soldering iron, (which when in my hands would most likely destroy the whole works)? Easy for you, deefeecult for me.
Absolutely not. There are some easy commercial products built precisely for this purpose. Here's an example of a simple 6db attenuator.
http://www.parts-express.com/harrison-labs-6-db-rca-line-level-audio-attenuator-pair--266-242
Folks in the Pro-audio world use these kind of things all the time.
Dave.
Thanks Davey, attenuators (gold colored) in use and have brought everything within good control:
Good deal. I think I can read 6db on the side of those. FYI, they also have 3db and 12db versions of those. They're kind of handy to have sometimes. :)
Cheers,
Dave.
Correct all around Davey, they are 6db and it would be useful to have some of different values, only downside being they 'ain't' exactly inexpensive. (However, quality never comes cheap, and at least they appear to be very well done.)
Thank you very much Davey, I'll be buying them. (You are however aware that you suggested that I could install resistors, I think that implies an entirely different game. Just as importantly, I could easily remove those attenuators, if and when I so desired.)
I don't have your problem (blowing a ribbon when comparing an LP to its CD counterpart, before having adjusted their levels). I say 'ribbon' because I don't use fuses! :-))
Now, I'm 'only' 65 and I run 3-way active Maggies ... so why don't I have this problem?
Simple - the output from my phono stage is comparable to the output from my CDP. Not exactly the same ... but all it needs is, maybe, a 10 deg turn of the volume knob to get the same volume when switching from one to the other.
So I suggest you need to get a new phono stage with less gain - because I think you are implying your LPs are louder than your CDs? (If not, get a phono stage with more gain!) Then you can do away with fuses and get a significant increase in SQ. :-))
Regards,
Andy
Thanks "andyr" for your suggestion.
"So I suggest you need to get a new phono stage with less gain - because I think you are implying your LPs are louder than your CDs? (If not, get a phono stage with more gain!) Then you can do away with fuses and get a significant increase in SQ. :-))"
Yes, my pre-amp's phono output is greater than that from my CDPs.
You might have meant to write get a phono stage with *less* gain, either way one of us is having a 'senior moment'. Alternatively I could seek a phono cartridge having a lower output level. I don't really think I want to adopt either of those two alternatives since desiring the highest signal to noise ratio, that would degrade the SQ when listening to LPs.
(In choosing a MM phono cartridge, one of the characteristics I always select for are those having highest output level, ~4.5 to 5.0mV) OTOH I might better employ one of those portable amplifiers (e.g. NuForce) or a headphone amp to increase the signal level from my CDP.
Inside your phono stage put (or get a tech to put) a voltage-divider on the output RCAs.
This will enable the actual output level to be reduced - the resistor values depend on:
1. the current output impedance of your phono stage
2. the output signal level of your phono stage, and
3. the output signal level of your CDP.
I can give you the values if you give me the answers to the above facts. Davey could, too.
Regards,
Andy
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