[Amps] Blown anode choke TL922

[Diane & Edward Swynar]

Hi Guys,

I don't believe the old National R-175 / 175A had enough "L" to be suitable
for 160-meters---but I could (as always) be corrected! Hi

~73~ de Eddy VE3CUI - VE3XZ


****************************************************************************
*********************


----- Original Message -----
From: "4Z1TL" <4z1tl at iarc.org>
To: "Diane & Edward Swynar" <deswynar at xplornet.ca>
Sent: Monday, April 25, 2011 3:27 AM
Subject: Re: [Amps] Blown anode choke TL922


> Yes - it's the TL922
>
> ----- Original Message -----
> From: "Diane & Edward Swynar" <deswynar at xplornet.ca>
> To: "Dan Hearn" <n5ardxcc at gmail.com>; "Jim W7RY" <w7ry at inbox.com>
> Cc: <amps at contesting.com>; "4Z4TL_IARC_300" <4z4tl at iarc.org>
> Sent: Monday, April 25, 2011 0:34
> Subject: Re: [Amps] Blown anode choke TL922
>
>
> > 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 at gmail.com>
> > To: "Jim W7RY" <w7ry at inbox.com>
> > Cc: <amps at contesting.com>; "4Z4TL_IARC_300" <4z4tl at 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 at 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 at iarc.org>
> >> > Sent: Sunday, April 24, 2011 12:01 AM
> >> > To: <amps at contesting.com>
> >> > Cc: <w7ry at 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 at inbox.com>
> >> > >> Subject: Re: [Amps] Blown anode choke TL922
> >> > >> To: "4Z4TL_IARC_300" <4z4tl at iarc.org>, <amps at 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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