There's a front panel Sidetone level adjustment ("S-TONE") on both the 565
and 566.
Barry N1EU
On Thu, Aug 25, 2016 at 8:39 AM, Gary J FollettDukes HiFi <
dukeshifi@comcast.net> wrote:
> I like the response regarding changing the resistors but am somewhat
> concerned that your side tone will be too loud to the point where it is
> damaging to your hearing.
>
> Also, you had said originally that this arrangement had previously worked.
> If tat is incorrect, my apologies for the speculation of a part failure.
>
> s there a separate adjustment in the menus for sidetone level so that,
> once you make the resistor change, you won’t blow your ears out?
>
> I don’t really as I never used an Orion on CW.
>
> Gary
>
>
>
>
> > On Aug 25, 2016, at 6:48 AM, Robert P. Santella <bobw2pnj@optimum.net>
> wrote:
> >
> > Thanks, Jim.
> >
> > Sent from my iPad
> >
> >> On Aug 24, 2016, at 1:32 PM, Jim Brown <k9yc@audiosystemsgroup.com>
> wrote:
> >>
> >>> On Wed,8/24/2016 10:08 AM, Robert P. Santella wrote:
> >>> Impedance needs to be 30 ohms.
> >>
> >> NO! Headphone impedance is NOT critical. Audio power amplifiers are
> VERY different from RF power amplifiers. Virtually all audio amplifiers are
> low impedance sources, and are designed to drive any impedance greater than
> a design minimum. For example, the source impedance of a loudspeaker output
> stage is a small fraction of an ohm, and is designed to drive any
> loudspeaker load greater than 4 ohms. The relationship between these two
> impedances is called the "damping factor," and 100 is a typical value. A
> well-designed headphone amp will include a low-value resistor in series to
> protect the amplifier from being shorted when headphones are being plugged
> and unplugged.
> >>
> >> Most modern headphones are in the range of 20 - 300 ohms, and a
> well-designed headphone amp should drive all of them just fine. What
> matters a lot more is voltage sensitivity, and headphone mfrs generally get
> that right too. Many years ago, I carried around a set of crystal
> headphones in my toolkit when I worked on troubleshooting audio systems in
> buildings. They were sensitive enough that I could hear (weakly) the signal
> of an unamplified microphone, yet the impedance was high enough that they
> didn't load most circuits!
> >>
> >> 73, Jim K9YC
> >>
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