Hi Guys,
Does that specific amplifier incorporate 160-meters...?
If not, find yourself a good old National-brand R-175A plate choke (I
believe that's the model/part number of it), & install it (hopefully it'll
fit). Period.
The "A" designation denotes a design change incorporated AFTER the adoption
of the 15-meter band, i.e. it eliminates a resonance point found in the
21-MHz region with the original R-175 model, and so is more desirable.
I have a friend who is parting-out the remains of an estate sale---and a
National choke is still a part of the left-overs (not sure if it was an "A"
model, or not). Sounds like a painless solution to me...!
~73~ de Eddy VE3CUI - VE3XZ
****************************************************************************
********************
----- Original Message -----
From: "Dan Hearn" <n5ardxcc@gmail.com>
To: "Jim W7RY" <w7ry@inbox.com>
Cc: <amps@contesting.com>; "4Z4TL_IARC_300" <4z4tl@iarc.org>
Sent: Sunday, April 24, 2011 5:21 PM
Subject: Re: [Amps] Blown anode choke TL922
> No one has mentioned between turn capacitance. This could be a factor if
the
> wire insulation is not the same material and thickness as the choke you
are
> trying to copy.
>
> 73, Dan, N5AR
>
> On Sun, Apr 24, 2011 at 1:21 PM, Jim W7RY <w7ry@inbox.com> wrote:
>
> > Isaac.
> > I attempted to re-wind an Ameritron choke and was not too successful. I
> > did
> > not have the EXACT size wire that was on the original choke. That makes
a
> > huge difference.
> >
> > I would attempt to re-wind your choke or just replace it with an
Ameritron
> > choke. I understand you're not in America but it may be worth it.
> >
> > Please keep us informed and good luck!
> >
> > Jim
> >
> >
> > --------------------------------------------------
> > From: "4Z4TL_IARC_300" <4z4tl@iarc.org>
> > Sent: Sunday, April 24, 2011 12:01 AM
> > To: <amps@contesting.com>
> > Cc: <w7ry@inbox.com>
> > Subject: Re: Blown anode choke TL922
> >
> > > Hi Jim
> > > The choke is a home-made replica (quite close) of the original stock.
> > > I wounded it myself, but never evaluated it with a Dip meter.
> > > (I counted turns, measured spacings, wire diameter & inductance, &
copied
> > > it to my best ability).
> > >
> > > In the last 2-3 months main bands were 20,15,10 & 12, mostly in RTTY
at
> > > 400-600w out.
> > >
> > > The amp was on 20m when this happened, no TX. I just flipped from SSB
to
> > > CW intending to QRT.
> > > Since the prolonged heating is obvious, I think this has been building
up
> > > for the last weeks / months.
> > >
> > > MODS to the amp are numerous: pse see a page I prepared a year ago
after
> > > finishing the work :
> > > http://www.iarc.org/~4z4tl/TL922/index.html
> > > Tks , Isaac 4Z1TL
> > >
> > >> Date: Sat, 23 Apr 2011 07:50:47 -0700
> > >> From: "Jim W7RY" <w7ry@inbox.com>
> > >> Subject: Re: [Amps] Blown anode choke TL922
> > >> To: "4Z4TL_IARC_300" <4z4tl@iarc.org>, <amps@contesting.com>
> > >>
> > >> What frequency have you been operating on? What other sort of mods
have
> > >> been
> > >> to the amplifier? Is the plate choke stock or has it been rewound?
> > >> 73
> > >> Jim W7RY
> > >
> > >
> > >
> > >
> > > -----
> > > No virus found in this message.
> > > Checked by AVG - www.avg.com
> > > Version: 10.0.1321 / Virus Database: 1500/3593 - Release Date:
04/23/11
> > >
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