[TechAssist] Re: 70 volt line audio amp
- From: "J Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 28 Apr 2005 16:10:16 -0400
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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