Hi Carl,
Most interesting---many thanks!
Maybe I'll pull the ol' multi-pi National 3.0-Mh.(?) behemoth out of my HB
2x813 affair, & replace it with the R-175A that I have here in my junque
boxxe: a coupla years ago I had a solenoid-type 200-uh. choke in the
amplifier (which I used on ALL bands), & I replaced it with the multi-pi
coil when my promary focus was 160-meters...but now that 10- and 15-meters
are coming to life, I'd like to use the linear on those bands, as well...
The R-175A may well be my ticket for a true multi-band KW again...
Thanks again, & my vy
~73~ de Eddy VE3CUI - VE3XZ
****************************************************************************
********************
----- Original Message -----
From: "Carl" <km1h@jeremy.mv.com>
To: "Diane & Edward Swynar" <deswynar@xplornet.ca>; "4Z1TL" <4z1tl@iarc.org>
Cc: <amps@contesting.com>
Sent: Monday, April 25, 2011 10:23 AM
Subject: Re: [Amps] Blown anode choke TL922
> It has a lot more L than what is used these days in many amps. In fact it
is
> 225uH which is "coincidentally" the same as in the current Ameritrons and
> copied by Alpha in their latest amps.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Diane & Edward Swynar" <deswynar@xplornet.ca>
> To: "4Z1TL" <4z1tl@iarc.org>
> Cc: <amps@contesting.com>
> Sent: Monday, April 25, 2011 9:20 AM
> Subject: Re: [Amps] Blown anode choke TL922
>
>
> > 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@iarc.org>
> > To: "Diane & Edward Swynar" <deswynar@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@xplornet.ca>
> >> To: "Dan Hearn" <n5ardxcc@gmail.com>; "Jim W7RY" <w7ry@inbox.com>
> >> Cc: <amps@contesting.com>; "4Z4TL_IARC_300" <4z4tl@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@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
> >> >> > >
> >> >> > _______________________________________________
> >> >> > Amps mailing list
> >> >> > Amps@contesting.com
> >> >> > http://lists.contesting.com/mailman/listinfo/amps
> >> >> >
> >> >> _______________________________________________
> >> >> Amps mailing list
> >> >> Amps@contesting.com
> >> >> http://lists.contesting.com/mailman/listinfo/amps
> >> >
> >>
> >
> > _______________________________________________
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> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
>
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