My TL922 had a very similar problem, the noise coming from the PA cavity ~
parasitic suppression ~ loose screws ~ over the years.
It was annoying my dog also, although he does tend to whimper & howl randomly
anyway....
At first I thought the amp, when I was tuning it up, was trigging the PIR /
Alarm circuitry in the shack. I later confirmed that it was high frequency
audio coming from the amp by using a copy of DL4YHF's Spectrum Lab (free down
load), my PC sound card & microphone. Set the Spectrum Lab to "bat detector",
wave the microphone around, and you'll see / find the noise. Worth checking
that it is actually the amp, and not some other device emitting the noise when
you tune up the amp.
The XYL has threatend to use a remote controlled dog collar on me, to call me
in from the shack at dinner times.....but so far the dog whistle is
working...it sets the dog off !
73
Adrian MW1LCR / GW9X
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of
amps-request@contesting.com [amps-request@contesting.com]
Sent: 04 February 2015 11:01
To: amps@contesting.com
Subject: Amps Digest, Vol 146, Issue 6
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Today's Topics:
1. Re: "need zener' (Carl)
2. I'm not kidding: TL922 (Dave Borcher)
3. Re: I'm not kidding: TL922 (Robert Morris)
4. Re: I'm not kidding: TL922 (Colin Lamb)
5. FW: I'm not kidding: TL922 (Matt)
6. Re: I'm not kidding: TL922 (Alek Petkovic)
7. Re: D.C. on filaments of GS-35B? (Nuno Lopes)
8. Re: D.C. on filaments of GS-35B? (Chris Wilson)
9. Re: I'm not kidding: TL922 (Louis Parascondola via Amps)
10. Re: D.C. on filaments of GS-35B? (Nuno Lopes)
----------------------------------------------------------------------
Message: 1
Date: Tue, 3 Feb 2015 15:36:39 -0500
From: "Carl" <km1h@jeremy.qozzy.com>
To: "Al Kozakiewicz" <akozak@hourglass.com>, <amps@contesting.com>
Subject: Re: [Amps] "need zener'
Message-ID: <58CB25651CAE44A1834358FA900B65DC@computer1>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
The Heath SB-230 is another using a TO-3 cased zener, Ive used a 1W zener,
small transistor and resistor for decades, mid 80's or so,
Carl
KM1H
--------------------------------------------------
From: "Al Kozakiewicz" <akozak@hourglass.com>
Sent: Tuesday, February 03, 2015 2:06 PM
To: <amps@contesting.com>
Subject: Re: [Amps] "need zener'
> The problem with the specific part number mentioned is that it is in a
> TO-3 case, which I suspect are really rare. Stud packaged Zeners are
> readily available, including the stud packaged version of this particular
> Zener, though any 5.6V 50W part should work.
>
> I think the issue is whether the requester wants to do the necessary
> redesign and/or the mechanical rework.
>
> Al
> AB2ZY
> ________________________________________
> From: Amps <amps-bounces@contesting.com> on behalf of Boye Christensen
> <oz7c@cool.dk>
> Sent: Tuesday, February 3, 2015 1:34 PM
> To: amps@contesting.com
> Subject: Re: [Amps] "need zener'
>
> Hi to all
>
> Last time i neded a 50W Zener for repair of an amp AL1200
> i did buy it from Farnell, and I've just checkit they still have them !
>
> 73 Boye OZ7C
>
>
>
>
>
> Den 03/02/2015 kl. 15:24 skrev Roy:
>> Try RF Parts
>>
>> 73, Roy K6XK
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
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------------------------------
Message: 2
Date: Tue, 3 Feb 2015 20:12:48 -0800
From: Dave Borcher <deathgrip52@gmail.com>
To: amps@contesting.com
Subject: [Amps] I'm not kidding: TL922
Message-ID:
<CAKgBPf30t=yEoN3a1OEwYdGzBVrc7rdPdirYurCXVkfHV=PhAQ@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Group, this is for real, I'm looking for suggestions. TL922 amp, fairly
good condition;when I key it full power for tuneup or CW, my little dog
goes absolutely nuts. An LK500 amp doesn't bother the dog. I like the
TL922 but I don't like to torment the dog. I suspect transformer
laminations buzzing, but I'd have thought I'd hear that. Again, this is
for real, and I'd like to hear serious suggestions of what to look for or
how to test. Thanks
------------------------------
Message: 3
Date: Wed, 4 Feb 2015 00:49:53 -0500
From: Robert Morris <robrk@nidhog.net>
Cc: amps@contesting.com
Subject: Re: [Amps] I'm not kidding: TL922
Message-ID: <38A1A826-1CB3-4284-970B-D593F96E8653@nidhog.net>
Content-Type: text/plain; charset=us-ascii
On Feb 3, 2015, at 11:12 PM, Dave Borcher wrote:
Group, this is for real, I'm looking for suggestions. TL922 amp, fairly
good condition;when I key it full power for tuneup or CW, my little dog
goes absolutely nuts. An LK500 amp doesn't bother the dog. I like the
TL922 but I don't like to torment the dog. I suspect transformer
laminations buzzing, but I'd have thought I'd hear that. Again, this is
for real, and I'd like to hear serious suggestions of what to look for or
how to test. Thanks
_______________________________________________
Firmly hold the dog, take an 8.3" length of nichrome wire and......
------------------------------
Message: 4
Date: Tue, 03 Feb 2015 22:04:16 -0800
From: Colin Lamb <k7fm@teleport.com>
To: amps@contesting.com
Subject: Re: [Amps] I'm not kidding: TL922
Message-ID: <54D1B660.9070503@teleport.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 2/3/2015 8:12 PM, Dave Borcher wrote:
> Group, this is for real, I'm looking for suggestions. TL922 amp, fairly
> good condition;when I key it full power for tuneup or CW, my little dog
> goes absolutely nuts.
Parasites?
Colin K7FM
------------------------------
Message: 5
Date: Wed, 4 Feb 2015 00:38:43 -0600
From: "Matt" <maflukey@gmail.com>
To: <amps@contesting.com>
Subject: [Amps] FW: I'm not kidding: TL922
Message-ID: <009e01d04045$38a08770$a9e19650$@gmail.com>
Content-Type: text/plain; charset="us-ascii"
Hi Colin,
First intuition is audio noise that is just higher than human hearing range
but still within the dogs hearing range. Key down, such as tuneup and CW
as you describe works the power supply transformer hard and for duration
long enough to get stuff vibrating due to the magnetic fields of the
transformer. Although the transformer vibrates at 60 hz (in the US), the
assembly may have a resonance at a (much) higher ordered harmonic.
The only suggestion I can think of at the moment to confirm this theory (and
assist in damping the vibration if correct) would be to use an extended
range microphone and display its output on an oscilloscope so that you
would be able to see noises what you can't hear. First thought for
correction would be to make sure all the fasteners on and around the
transformer are tight - would think that even small changes in fastener
tension could make, break, or alter a vibration at that frequency - so just
changing the tension of the fasteners a little might possibly help.
Mechanical vibration has similar properties to an electrical tank circuit.
Resonance is proportional to (k/m)^0.5 where k is spring rate and m is mass.
Spring rate is generally related to the mechanical stiffness of the
assembly, of which fasteners may play a part of. A mechanical system's
response at resonance can be altered by dampening (friction), which changes
the Q of the response. Techniques in reducing mechanical vibration involve
altering the resonance frequency out of the excitation range, or if not
practical, adding dampening to reduce the peak magnitude of the response.
Hope this helps & good luck.
73
Matt
KM5VI
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Colin Lamb
Sent: Wednesday, February 04, 2015 12:04 AM
To: amps@contesting.com
Subject: Re: [Amps] I'm not kidding: TL922
On 2/3/2015 8:12 PM, Dave Borcher wrote:
> Group, this is for real, I'm looking for suggestions. TL922 amp,
> fairly good condition;when I key it full power for tuneup or CW, my
> little dog goes absolutely nuts.
Parasites?
Colin K7FM
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
------------------------------
Message: 6
Date: Wed, 04 Feb 2015 15:41:07 +0800
From: Alek Petkovic <vk6apk@bigpond.com>
To: AMPS <amps@contesting.com>
Subject: Re: [Amps] I'm not kidding: TL922
Message-ID: <54D1CD13.9030709@bigpond.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
1. Get a child to listen for it. They have better hearing that we do.
2. Record it with a mic into your pc and with the appropriate software,
play it back and look at the displayed spectrum.
3. Put earmuffs on the dawg.
73, Alek
VK6APK
On 4/02/2015 12:12 PM, Dave Borcher wrote:
> Group, this is for real, I'm looking for suggestions. TL922 amp, fairly
> good condition;when I key it full power for tuneup or CW, my little dog
> goes absolutely nuts. An LK500 amp doesn't bother the dog. I like the
> TL922 but I don't like to torment the dog. I suspect transformer
> laminations buzzing, but I'd have thought I'd hear that. Again, this is
> for real, and I'd like to hear serious suggestions of what to look for or
> how to test. Thanks
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
--
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http://www.qrz.com/db/vk6ap
Family Businesses:
SP Electrical. www.spelectrical.net.au
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------------------------------
Message: 7
Date: Wed, 4 Feb 2015 09:33:48 +0000
From: Nuno Lopes <ct2iry@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] D.C. on filaments of GS-35B?
Message-ID:
<CAAQo0Dnfejx0UU1gLBWO3P+EkGk3RnEAaO9q+xdDT1VLizKp-g@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Hi,
Me too.
I would like to know the pros and cons of running the filaments of an GS-35
with Vdc , you can get small power supply of 15, 24 or 30Vdc at 10A, by
around $30 some with 3 way out, you can run 1 or 2 tubes, and relays,
separately this is far more cheap than making one or to Vac transformer(s)
for the tubes and Vdc for the relays.
Any commends?
2015-01-30 22:31 GMT+00:00 nemo zilch <nemozilch@gmail.com>:
> Seems to me it would be good to use a dc supply for the filament of the
> GS35B amp I am building. Easier to build an effective soft start circuit,
> easy to build the supply. I understand why dc is not good for tubes which
> do not have cathodes, the effective bias is different from one side of the
> filament to the other. Thus emission does not take place uniformly along
> the filament.
>
> But is there any reason not to use dc on an indirectly heated tube such as
> the GS35B? Advice appreciated.
>
> Bob W4AOS
>
>
> --
> ==========================================================
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
--
*73 Nuno CT2IRY*
------------------------------
Message: 8
Date: Wed, 4 Feb 2015 10:32:05 +0000
From: Chris Wilson <chris@chriswilson.tv>
To: Nuno Lopes <ct2iry@gmail.com>, amps@contesting.com
Subject: Re: [Amps] D.C. on filaments of GS-35B?
Message-ID: <696886015.20150204103205@chriswilson.tv>
Content-Type: text/plain; charset=us-ascii
Hello Nuno,
On Wednesday, February 4, 2015, you wrote:
> Hi,
> Me too.
> I would like to know the pros and cons of running the filaments of an GS-35
> with Vdc , you can get small power supply of 15, 24 or 30Vdc at 10A, by
> around $30 some with 3 way out, you can run 1 or 2 tubes, and relays,
> separately this is far more cheap than making one or to Vac transformer(s)
> for the tubes and Vdc for the relays.
> Any commends?
Dominic, http://f1frv.free.fr/ uses switch mode DC supplies for many
of his big amp filament supplies. I am doing the same with a couple of
projects, I don't expect issues.
--
Best regards,
Chris mailto:chris@chriswilson.tv
------------------------------
Message: 9
Date: Wed, 4 Feb 2015 05:55:30 -0500
From: Louis Parascondola via Amps <amps@contesting.com>
To: vk6apk@bigpond.com, amps@contesting.com
Subject: Re: [Amps] I'm not kidding: TL922
Message-ID: <8D20E8039E7CDDB-E10-1BB75@webmail-vd010.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"
Does the dog have an invisible fence collar on?
-----Original Message-----
From: Alek Petkovic <vk6apk@bigpond.com>
To: AMPS <amps@contesting.com>
Sent: Wed, Feb 4, 2015 2:41 am
Subject: Re: [Amps] I'm not kidding: TL922
1. Get a child to listen for it. They have better hearing that we do.
2. Record it with a mic into your pc and with the appropriate software,
play it back and look at the displayed spectrum.
3. Put earmuffs on the dawg.
73, Alek
VK6APK
On 4/02/2015 12:12 PM, Dave Borcher wrote:
> Group, this is for real, I'm looking for suggestions. TL922 amp, fairly
> good condition;when I key it full power for tuneup or CW, my little dog
> goes absolutely nuts. An LK500 amp doesn't bother the dog. I like the
> TL922 but I don't like to torment the dog. I suspect transformer
> laminations buzzing, but I'd have thought I'd hear that. Again, this is
> for real, and I'd like to hear serious suggestions of what to look for or
> how to test. Thanks
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
--
http://www.qrz.com/db/vk6apk
http://www.qrz.com/db/vk6ap
Family Businesses:
SP Electrical. www.spelectrical.net.au
Hampers by Hand. www.facebook.com/hampersbyhand
---
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------------------------------
Message: 10
Date: Wed, 4 Feb 2015 11:00:58 +0000
From: Nuno Lopes <ct2iry@gmail.com>
To: Chris Wilson <chris@chriswilson.tv>
Cc: amps@contesting.com
Subject: Re: [Amps] D.C. on filaments of GS-35B?
Message-ID:
<CAAQo0Dn=LyMxM9ZfjJzjz=e=_EcyB6fm_8vV=DjcUw9pWKFx6A@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Morning Chris,
I know Dominic is using Vdc on the filament, so other guys in France are
using those power supply or PC power supply to feed filament and relays ,
that's the reason that I was asking.
Any special care when feeding with Vdc?
2015-02-04 10:32 GMT+00:00 Chris Wilson <chris@chriswilson.tv>:
>
>
> Hello Nuno,
>
> On Wednesday, February 4, 2015, you wrote:
>
> > Hi,
>
> > Me too.
>
> > I would like to know the pros and cons of running the filaments of an
> GS-35
> > with Vdc , you can get small power supply of 15, 24 or 30Vdc at 10A, by
> > around $30 some with 3 way out, you can run 1 or 2 tubes, and relays,
> > separately this is far more cheap than making one or to Vac
> transformer(s)
> > for the tubes and Vdc for the relays.
>
> > Any commends?
>
>
> Dominic, http://f1frv.free.fr/ uses switch mode DC supplies for many
> of his big amp filament supplies. I am doing the same with a couple of
> projects, I don't expect issues.
>
>
>
>
>
>
>
> --
> Best regards,
> Chris mailto:chris@chriswilson.tv
>
>
--
*73 Nuno CT2IRY*
------------------------------
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------------------------------
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