McIntosh MC250 hookup help

Re: McIntosh MC250 hookup help

Postby Pete B. » Fri Jun 07, 2013 11:04 am

One other observation about the Mc's.
The two JBL-E120's I have happen to be 4-ohm, so if I run them in paralell, the Mc actually supports a 2-ohm load when bridged to Mono.
Nice!
Also, I have noticed that, in many cases (Ebay/Craigslist/Vintage-shops) vintage/original 16-ohm JBL''s are very inexpensive compared to 8-ohm models, and the Mc has a 16-Ohm tap right on the front. Nice!
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Re: McIntosh MC250 hookup help

Postby JustinJohn » Thu Jun 27, 2013 2:32 am

I've been reading some conflicting info regarding a "warmup" period required by McIntosh amps, specifically the MC250. Being solid state amps, I was under the impression these amps didnt require warming up... Can someone clarify this?

Thanks in advance!!

=)
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Re: McIntosh MC250 hookup help

Postby NSP » Thu Jun 27, 2013 6:28 am

JustinJohn wrote:I've been reading some conflicting info regarding a "warmup" period required by McIntosh amps, specifically the MC250. Being solid state amps, I was under the impression these amps didnt require warming up... Can someone clarify this?

Thanks in advance!!

=)


Yeah, there was a recent thread stating a theory that the larger caps require a long period of time (24hrs?) to fully charge and thus provide optimal tone. So, should one just leave it powered up all the time if used regularly? That seems plausible, but leaving my Mc250 powered up like that concerned me a bit.

So, I contacted Terry DeWick this morning. He recently worked his magic on my amp and I figured he would be able to shed some light on the subject. He was quick to reply and this is what he had to say:

"My philosophy is if not in the room it is OFF, I don’t like to leave valuable equipment unattended and adding to my electric bill and heat load. Once a month usage (minimum) is more important to long life and better sound than continuous on."

I guess that backed up what I was feeling, so mine will be off when not in use.

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Re: McIntosh MC250 hookup help

Postby TI4-1009 » Thu Jun 27, 2013 7:18 am

NSP wrote:Yeah, there was a recent thread stating a theory that the larger caps require a long period of time (24hrs?) to fully charge and thus provide optimal tone. So, should one just leave it powered up all the time if used regularly? That seems plausible, but leaving my Mc250 powered up like that concerned me a bit.


Knowing very little about the subject he began talking anyway.... :-)

Do the caps in a solid state amp not hold their charge like they would in a tube amp? I know in many tube amps you have to drain the filter caps before working on the amp because they can hold their charge for a long time (unless they have that draining resistor).
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Re: McIntosh MC250 hookup help

Postby schmidtz » Thu Jun 27, 2013 8:26 am

The only thing that will affect a cap's dissipation is schematic specific. In theory, if a cap is charged and is not part of a closed circuit, it will hold its charge forever. In practice, all caps will slowly lose their charge. Like you said earlier, some are hooked up to a resistor which completes the circuit, and thereby drains the cap over time.

If all of this seems interesting, I would suggest taking a Electricity & Magnetism course (typically Physics 2) over at your local college! Essentially, the circuit we are discussing (NOT the full McIntosh circuit) is an RC (resistor-capacitor) circuit, and each one has a specific time that functions as the exponential charge decay value, denoted by the Greek letter "tau".
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Re: McIntosh MC250 hookup help

Postby mgbills » Thu Jun 27, 2013 8:41 am

To clarify the "Leaving it on" post...

That was my post. I think the SS Mc's do sound marginally better when left on. But amongst the 2 audiophile repair guys I contacted, I recieived 2 diffent answers. 1) Leave it on. 2) Leave it off when not in in use. Run it at least once a year so you don't ruin the caps.

I posted it to see if someone with fancier ears than mine could do a study. I left mine on for a week...and then the treehugger in me couldn't bare it. (...or bear it??).

Regard or disregard as your personal preference dictates. At this point science (and Pat Hickman) appear to be in the "Turn it off" camp.

Sorry for any confusion.
M
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Re: McIntosh MC250 hookup help

Postby TI4-1009 » Thu Jun 27, 2013 9:47 am

Tip from Lovelight:

"AND LEAVE IT ON!"

(and it's bear- bare it around here and you could get arrested...)
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Re: McIntosh MC250 hookup help

Postby JustinJohn » Thu Jun 27, 2013 12:09 pm

thanks for the replies guys! Currently I've had mine on for about 3 days - I play a show this Saturday (big show on a big stage in Portland with our friends Shafty - local Phish tribute act - https://www.facebook.com/events/331236537004499/) - So I wanted to make sure the MC is ready to go for that gig.

I'm not honestly sure that I can tell the difference when the MC is "warmed up" (after being on for a few hours), but I think it sounds more seasoned after this time.... or maybe my ear adjusts... I'm not sure.
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Re: McIntosh MC250 hookup help

Postby TI4-1009 » Thu Jun 27, 2013 1:41 pm

Some have the same opinion about tube amps- that they sound better after being on for a few hours. My old ears sure can't hear it.
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