The real reason the audio doesn't go all the way down has nothing to
do with the switch. When the control is all the way down but the
switch is not off,
the wiper is perfectly aligned with the contact on the carbon. What
causes it to still pass audio is the contact on the wafer has about a
1/16" of carbon between it
and the wiper. This causes the resistance to be anywhere from 3 to 10
ohms, just enough to make it so you can still hear it. I have 5 TR7s
and I disassembled
the pot on each one and bent the outer contact on the wiper so it is
out far enough to bypass that small resistance on the wafer. Thus on
all of mine
the volume goes all the way down. Edwin Joe Pyles KC9LAD.
At 04:15 PM 2/18/2008, you wrote:
Dieter Horst <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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Hello Ken,
I am afraid, it is normal. Reason is that when audio is completely
muted, the radio is off because the on/off switch is activated by then...
There is only one cure I once tried: you add a resistor to decrease
the max. volume and therefore also the min. volume. But I removed it
again and use the method you described i. e. RF control.
Enjoy your TR-7 !
73, Dieter DL5RDO
> I recently acquired TR-7 SN 3173, my first. Is it normal for the AF
> control to provide enough volume to still hear easily when full
> counter-clockwise or is the pot changing value with age? Only way I have
> of cutting audio volume down lower is by use of RF control. Doesn't
> bother me but I have a picky XYL who's not all that fond of my hobby.
> Thanks,
> Ken - N0VA
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