It still has resonances, dont go on WARC without testing.
The Ameritron sells for less than the R-175 or 175A often goes for on
fleabay.
Carl
KM1H
----- 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: Sunday, April 24, 2011 5:34 PM
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
>> > >
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>> >
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