Re: Power Amplifier for coil machine shutting off - Athy

[Guest guest]

Athy,

Are you certain that you and your mother had absolutely NO SIGNAL cominig into

the amplifier when you powered it on or off? That is the most likely reason why

you and your mother would both damage your amp switches. Overuse of the switch?

Just HOW MANY times a day were you both switching it on and off?

Among musicians, who regularly use this amp(which is highly rated, BTW), the

signal kicking back and damaging the equipment, is understood as part of the

phenomenon known as a " feedback loop " . If ANY KNOBS that control the signal are

positioned to allow it to run through the system, it could feed back to the amp

switch, damaging it. This is common knowledge among musicians who use this

equipment.

If this is not the case, then, I have no explanation as to why BOTH you and your

mother had your amp switches damaged. You say you've spoken with other coil

users who also had their switches damaged? Did you also ask exactly how they

were using their equimpment? I have never heard of this from anyone else,

myself.

The QSC RMX1850HD model amplifier is widely used, and if there was a switch

problem, it would have most likely been reported in the numerous music forums on

the net, where people who use that equipment exchange info. Musicians who use it

are aware of the pitfalls of the feedback loop, and the need for NO GAIN when

powering on and off.

The signal from the frequency generator must be prevented from running into the

amp when powering on and off. To power the system down, I always turn down the

" AMPL " knob on the frequency generator to min first. Next, I turn down the gain

knobs on the amp to min, then I turn off the frequency generator. Then I let the

amp fan run until I hear that the " high " mode reverts back to low, before

turning off the amp.

To power the system up, I turn on the frequency generator first, then turn on

the amp, and turn the gain knobs up to max. Then, I turn the " AMPL " knob up,

based on the meter readout on the rife unit.

I always had my system plugged into a grounded surge strip, from day one. As you

say you only added the surge strip later on (?), lack of grounding could

possibly have been the problem causing you and your mother's damaged amp

switches.

Again, I personally have not heard of anyone else having this problem, but

that's just my experience. Glad to hear that your new method of powering on and

off is working for you.

- Jane

> > > > > > > >

> > > > > > > > My coil keeps cutting out after just a few minutes of use.

> > > > > > > >

> > > > > > > > It will be working fine and then the noise cuts short and the

> > > > > capacitor

> > > > > > > > jumps to zero. Hard to get my required coiling in this way!

> > > > > > > >

> > > > > > > > My coil got a bit banged up when my boyfriend shipped it to me

> > > > > because he

> > > > > > > > used zero insulation for the coil. Plenty of bubble wrap for the

big

> > > > > pieces,

> > > > > > > > but he just threw the coil in there.

> > > > > > > >

> > > > > > > > I think the leads that plug into the capacitor are staying in

ok, so

> > > > > maybe

> > > > > > > > the problem is at the attachment to the coil itself?

> > > > > > > >

> > > > > > > > It was working fine for a week and a half since being shipped,

until

> > > > > today,

> > > > > > > > when it is cutting out every time I use it. Could it be related

to

> > > > > heat (the

> > > > > > > > house is warm today)?

> > > > > > > >

> > > > > > > > I can't get in touch with S--can't get him on the phone and

his

> > > > > message

> > > > > > > > box is full. I sent him an email a week ago and he hasn't

replied.

> > > > > > > >

> > > > > > > > -

> > > > > > > >

> > > > > > >

> > > > > >

> > > > >

> > > > >

> > > > >

> > > >

> > >

> >

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