[TechAssist] Re: 70 volt line audio amp
- From: "peter kowalik" <pe.kow@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 28 Apr 2005 23:20:33 -0400
Mark There is a good article on 70v speaker systems at
www.ticcorp.com/70v_guide.htm Peter Kowalik Keith's Stereo Burl ON
pe.kow@xxxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of markbrock
Sent: April 28, 2005 2:44 PM
To: techassist@xxxxxxxxxxxxx
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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