[TenTec] Century 21 audio hum

Howie WA3MCK wa3mck at gmail.com
Tue May 30 17:54:25 EDT 2017


Thank you
for the info on the swamping resistor placement and installation.

I have an analog C21. Bought it in the late 90's, had it on the air for a
few years, sold it to Joe N2CX, he had it for 15 or 20 years, and I bought
it back s few years ago.

It's beat up cosmetically but works fine. Replaced the finals not too long
ago... and now the PTO is starting to go - mechanically that is!

Ok - just checked - yes, when I turn down the volume there is a slight hum
with my old 8 ohm mono headphones.

I prefer to use the internal speaker which is fine for me and why I may
have not noticed the low/level hum.

By the way, I emailed TenTec several months ago concerning the availability
of a PTO repair kit for the C21 analog xcvr. I received an answer a few
weeks ago stating that they were in transition and to keep an eye on their
website. Nothing seen yet.

Howie WA3MCK

On Tuesday, May 30, 2017, Josh Gibbs <gibbsjj at gmail.com> wrote:

> Hi Howie,
> I opened up the plug on my phones (housing unscrews on this one, other
> plugs might not), unsoldered the wire that was connected to the 'tip'
> terminal, and put the resistor between that tip terminal and the wire that
> I unsoldered.
> I just used some test leads to clip in different value resistors when I was
> figuring out the best resistor value.
> Is your C21 the Digital or Analog version? How many Ohms are your
> headphones? You don't hear any loud humming with the phones plugged in and
> the audio turned down all the way?
> -Josh WA7FPV
> On Tue, May 30, 2017 at 2:03 PM, Howie WA3MCK <wa3mck at gmail.com
> <javascript:;>> wrote:
> > Hi Jim,
> > I don't have any noticeable hum on my C21. I however the swamping
> resistor
> > is a good idea. If I may ask - how and where did you install it?
> > Howie WA3MCK
> >
> >
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