Re: Line-out from speaker output

["Hambone Hamilton" <harpmanx@xxxxxxxxxxx>]

Thanks for correcting me, Mike!






>From: "IronMan Mike Curtis" <ironman@xxxxxxxxxxxxxxxxx>
>To: "Hambone Hamilton" <harpmanx@xxxxxxxxxxx>, <gigs@xxxxxxxxxxxxxxx>,   
><harp-l@xxxxxxxxxx>
>Subject: Re: Line-out from speaker output
>Date: Wed, 29 Jan 2003 12:17:22 -0800
>
>
>Actually, it's POWER SUPPLY caps that must be discharged.  And playing thru
>the amp is NOT how to do it.  The safest way is to use a clip lead and
>bleeder resistor.  If you don't know what this is, my advice is to let
>someone who knows what they're doing fix the amp.  There can be lethal
>voltages present, and I don't like funerals.
>
>Speaker output is basically low voltage (P=E^2R, so even a 50 watt @ 8 ohm
>or 100 watt @ 4 ohm amp has only around 20 volts present at full power).
>Besides, the caps are DC shorted thru the transformer and speaker.  You 
>will
>not need to discharge these.
>
>If you want to boost your amps input impedance, the simplest way is to 
>build
>an outboard box.  A simple op amp voltage follower will do the trick
>http://www.ironmancurtis.com/Mmojo.txt .  Your crystal or ceramic mic will
>sound VERY full.  Interestingly, I find that controlled magnetics and
>controlled reluctance mics also have a fuller sound into an ultra high
>impedance.
>
>----- Original Message -----
>From: "Hambone Hamilton" <harpmanx@xxxxxxxxxxx>
>To: <gigs@xxxxxxxxxxxxxxx>; <harp-l@xxxxxxxxxx>
>Sent: Wednesday, January 29, 2003 6:18 AM
>Subject: Re: Line-out from speaker output
>
>
> >
> > Caps need to be discharged...the easy, safe was to do this is to plug it
>in,
> > turn it on, play through it, and have someone unplug it while you are
>still
> > playing, my tech says this is a safe way to do it...amp should be safe 
>to
> > work on then...but confirm this with a tech that you trust, G, I'm just
> > passing along stuff I've heard.  Amps can kill you, in certain
> > circumstances, it doesn't pay to screw around.
> > Hambone
> >
> >
> >
> >
> >
> >
> > >From: "G." <gigs@xxxxxxxxxxxxxxx>
> > >Reply-To: "G." <gigs@xxxxxxxxxxxxxxx>
> > >To: "harp-l" <harp-l@xxxxxxxxxx>
> > >Subject: Re: Line-out from speaker output
> > >Date: Wed, 29 Jan 2003 13:16:29 +1300
> > >
> > >
> > >From:  Aki Karjalainen <akarjala@xxxx>
> > >Date:  Tue Jan 28, 2003  4:10 pm
> > >Subject:  Line-out from speaker output
> > >
> > >Just wanted to let you know I just added a line-out from the speaker
> > >output to my Crate508. Instructions:
> > >http://www.rru.com/~meo/Guitar/Amps/Kalamazoo/Mods/ezlo.html
> > >
> > >With Crate, you can just drill a hole in the plywood covering the
> > >chassis and fit the jack there.
> > >
> > >After this you'll have two options from where to go the mixing board.
> > >
> > >Regards,
> > >Aki
> > >---------------
> > >
> > >Is this so you can use the built in LINE OUT for the Effects Loop Aki?
> > >
> > >I just scored a VC508 yesterday, very pleased about it.  Small, light,
> > >loud,
> > >nice tone.  :)
> > >It already has a Sovtex EL84 power tube and I've ordered in a Sovtek
>12AY7
> > >pre
> > >amp tube,  I think 12AU7 is a bit low for my tastes.
> > >
> > >I am looking for advice on increasing the impedance of the Input of my
> > >Crate
> > >VC508.   I use Crystal, Ceramic, CM & CR mics, is 5M a good impedance 
>for
> > >all of
> > >these or is it worth looking into installing a switch and having two
> > >impedance
> > >settings depending on the mic?  If so what would the other value best 
>be
> > >set to?
> > >
> > >Can anyone give me some advice on rewiring this without eletrocuting
> > >myself?
> > >
> > >G.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >--
> > >Harp-l is sponsored by SPAH.
> > >Hosted by ValuePricehosting.com, www.valuepricehosting.com
> >
> >
> > _________________________________________________________________
> > Help STOP SPAM with the new MSN 8 and get 2 months FREE*
> > http://join.msn.com/?page=features/junkmail
> >
> > --
> > Harp-l is sponsored by SPAH.
> > Hosted by ValuePricehosting.com, www.valuepricehosting.com
> >


_________________________________________________________________
MSN 8 with e-mail virus protection service: 2 months FREE*  
http://join.msn.com/?page=features/virus