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Standby is o.k. for disconnecting/reconnecting speaker cabs,
but wait a few seconds after switching to standby as it takes
time for voltages to bleed off the caps.
Switching impedance while amp is on could cause major league
problems, but should be o.k. to do in standby mode.
I'd also guess that active pickups could more readily overdrive
the first stage input tubes, but who cares? If it gives you the
tone you're after, why worry about replacing preamp tubes more
often?
/Steve
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Try it and when it fries, I'll take it off your hands cheap :^)
Actually, what have you got to lose by powering it off to do
the things you described. When you set up your rig, make sure
all settings are right, then turn it on. Done, no risk. My PV
cab has a warning about switching the impedance while the amp
is powered up. Says it could damage the speakers.
Lv
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| Yea, once I toast it, I'll sell it real cheap,
like 500 bucks maybe...
The reason I've asked the question is,
since i've just added the extension cab, I was
shutting it off changing the config to see what
the difference in sound was... (Fatter with
the extension cab, of course,, I knew that)
Then I thought, this is silly, why not just do
the standy.. (again, assuming this cuts the heat
to the speakers..)
But then it got me thinking about it in general
so I thought I'd ask.. I'd have assume the damage
would have been to the amp, but I read here it's
actually the speakers that are suspect to damage,,
see! 'I did not know that'
But yer right, for the most part, it's not an issue,
cuz primarily, the extension cab is either there when
I juice it up, or it's not... (most of the time,
it'll be there..) just wonderin...
anyhow, as far as the active goes, I woudln't assume
it'd be a tube killer, besides, I'm really not
maxing out the level on the guitar's preamp, just
adding a little to add some more beef. (As if this
thing needs more beef,,, these Marshall JTM60s
honk for small portable combos boys.. The 'marshall'
sound, and no trucks or dollies needed.. way cool)
Thanks kids..
/r
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The active electronics are the same as having another preamp in the
circuit I would think. Since the amp is getting a hotter signal,
you probably wouldn't need to crank it as much as you would to get
the equivalent sound without the active electronics. In the end,
I don't think it makes a significant difference as to the life of
the tubes. If the standby switch basically isolates the speaker
output as if the amp were turned off, then I don't think it's a
big deal to plug/unplug the speaker cabs. Only when you have some
sort of output sitting there would it pose a problem. I'm not the
definitive expert on these types of issues however.
Lv
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| well, you'd have to have a few bolts loose to
start going after speaker jacks with the amp
cranked up anyway...
Good thing it takes two hands (for most) to
play guitar aye Larry.. Keeps you out-a trouble!
I think were all pretty much holding the line
on the preamp.. Don't really think it could harm
anything,, again, just a question of sorts...
I know that on the older rockmans, active pickups
use cause some problems.
So Larry, gonna be amp shopping ??????
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| >> So Larry, gonna be amp shopping ...
It'd be nice to have another amp to play with, but my wife won't buy
into it. Someday. The autobiasing feature on your amp, as well as
the availability of replacement tubes in a kit package are attractive
since my biggest hassle with tube amps has been replacing the damn
tubes. I especially like the autobiasing, nice feature!
Lv
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I've been using onboard preamps on my guitars for years and I've never
noticed any shorter-than-average tube life. This is with both a Twin
and a Marshall JCM 900. My guitar can drive headphones, so I've got a
*lot* more kick than the standard guitar.
If I'm using a clean setting with a lot of headroom, hitting the
preamp makes it much louder in a hurry. For a high gain setting, I get
even more gain, pushing the amp pretty hard it would seem. I played
the Twin like this for 10 years without a problem, and I'm probably
4-5 years into the Marshall without any trouble.
Kevin
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