[TechAssist] Re: 70 volt line audio amp
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 29 Apr 2005 00:19:05 -0500
Now that's a good analogy....the power grid
Damon Brunger
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "becyn" <becyn@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, April 28, 2005 5:26 PM
Subject: [TechAssist] Re: 70 volt line audio amp
> I'm going to ask a stupid question.
> Does the "new amp" have a 70v port output?
> If you are hooking up an 8 ohm system to the 70v ,
> you will have a MAJOR impedance mismatch.
> Essentially, the 70 v is the audio version of the power grid.
> Step up the voltage( reduce current) to send long distances in order to
> reduce
> I^2 *R losses.
>
> Jim McVey
> McVey Alltronix
> 327 Broadway
> Newburgh N.Y. 12550
>
> "If it doesn't play...
> CALL MCVEY !!!!!!"
> Factory authorized
> service for over 20
> major brands.
> 845 561 8383
> (Last of the Mohegans)
>
> J Silverman wrote:
>
> >70 ohms of resistance sounds high. Amps work into impedance, which is a
> >dynamic reflection of the load. DC ohms resistance should be much lower
than
> >the impedance number. Since that is a 70 volt line output, the DC load is
> >just the resistance of the transformer windings.
> >Jerry Silverman
> >Greentron Inc
> >4 Newland Ave
> >Greenville SC 29609
> >Fax/Phone 864 232 3889
> >mail to: greentron@xxxxxxx
> >----- Original Message -----
> >From: "markbrock" <markbrock@xxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Thursday, April 28, 2005 2:43 PM
> >Subject: [TechAssist] Re: 70 volt line audio amp
> >
> >
> >
> >
> >>brand new amp, works fine with one speaker and a mic, on the bench, but
> >>when attached to the phone system, has distortion, I tried to blame it
on
> >>the phone co because if I disconnected them it worked ok with one
speaker,
> >>no there pointing back at me, I need more ammo before I go further,
wish
> >>
> >>
> >I
> >
> >
> >>had a spare amp to try out. old amp has blown output ic and one of the
> >>
> >>
> >two
> >
> >
> >>filters popped its lid, I was just wondering if this 70 ohms of
> >>
> >>
> >resistance
> >
> >
> >>was going to be way off base , but apparently doesn't surprise anybody
> >>
> >>
> >yet,
> >
> >
> >>so I'll go a little farther.
> >>Brock Electronics
> >>R.R.4 box 237
> >>5208 cr.3385
> >>Independence Ks. 67301
> >>620-331-0235
> >>fax 331-7191
> >>
> >>markbrock@xxxxxxxxxxxxx
> >>Zenith*Philips*Peavey*Fender*Crate
> >>we work on all brands,makes,models
> >>of anything that plugs in the wall
> >>----- Original Message -----
> >>From: "becyn" <becyn@xxxxxxxxxx>
> >>To: <techassist@xxxxxxxxxxxxx>
> >>Sent: Thursday, April 28, 2005 9:43 AM
> >>Subject: [TechAssist] Re: 70 volt line audio amp
> >>
> >>
> >>
> >>
> >>>Divide and conquer !
> >>>
> >>>Have you bench tested the amp with a 1Khz sine?
> >>>It sounds more like the amp than the line.
> >>>Many of those mutiple speaker setups have the taps set for a
> >>>watt or less, so underpowering isn't an issue.
> >>>
> >>>Jim McVey
> >>>McVey Alltronix
> >>>327 Broadway
> >>>Newburgh N.Y. 12550
> >>>
> >>>"If it doesn't play...
> >>>CALL MCVEY !!!!!!"
> >>>Factory authorized
> >>>service for over 20
> >>>major brands.
> >>>845 561 8383
> >>>(Last of the Mohegans)
> >>>
> >>>
> >>>
> >>>
> >>>markbrock wrote:
> >>>
> >>>
> >>>
> >>>>ok, whats the limit of resistance I can have at the amp using a 70
> >>>>
> >>>>
> >volt
> >
> >
> >>>>line, I have around 70 ohms, unit is very distorted, 40 watt system
> >>>>
> >>>>
> >>about
> >>
> >>
> >>>>15 speakers, old unit burned up, they bought a new one and its all
> >>>>distorted, then they called me, I figured someone hung a regular
> >>>>
> >>>>
> >>speaker
> >>
> >>
> >>>>on the line but that would be closer to 16 or less ohms, is 70 ok ?
> >>>>
> >>>>
> >>they
> >>
> >>
> >>>>may be under powered but it worked fine for 10 years previous. thanks
> >>>>brock
> >>>>
> >>>>Brock Electronics
> >>>>R.R.4 box 237
> >>>>5208 cr.3385
> >>>>Independence Ks. 67301
> >>>>620-331-0235
> >>>>fax 331-7191
> >>>>
> >>>>markbrock@xxxxxxxxxxxxx
> >>>>Zenith*Philips*Peavey*Fender*Crate
> >>>>we work on all brands,makes,models
> >>>>of anything that plugs in the wall
> >>>>
> >>>>
> >>>>
>
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