[Hallicrafters] RE: Hallicrafters Digest, Vol 41, Issue 12

Sun Jun 10 11:54:37 EDT 2007

Greetings Van: On your power supply buzz, you might check the filter choke. I had a similar issue with a Hallicrafters PS for my SR-500. You might try isolating trouble shooting methods to see if it is the choke or xfmr (one could momentarily sub an appropriate resistor for the choke) . If it is ch or xfmr, one can take them to a electric motor shop and have the item "dipped and baked" which will tighten up and insulate everything. In my case even after dipping and baking, I still had some buzz left, so the best I could figger out was to mount the choke on grommets to dampen its vibration. Now it is tolerable.

Beware high voltages - avoid shocking experiences.

73, Ken Ketner KA5ELD
>----- ------- Original Message ------- -----
>From: hallicrafters-request at mailman.qth.net
>To: hallicrafters at mailman.qth.net
>Sent: Sun, 10 Jun 2007 -0400 (EDT) 04:00:10
>
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>Today's Topics:
>
>   1. DIN cable (k0ewu9 at juno.com)
>   2. Off-subject question on telephones (Waldo
>Magnuson)
>   3. Re: Off-subject question on telephones
>(Edward B Richards)
>   4. HV transformer buzzing!	Help Please (Van
>K7VS)
>
>
>---------------------------------------------------
>-------------------
>
>Message: 1
>Date: Sat, 9 Jun 2007 12:12:29 -0500
>From: k0ewu9 at juno.com
>Subject: [Hallicrafters] DIN cable
>To: ICOM at mailman.qth.net,
>hallicrafters at mailman.qth.net
>Cc: kenwood at mailman.qth.net
>Message-ID:
><20070609.121230.3304.0.K0EWU9 at juno.com>
>Content-Type: text/plain; charset=us-ascii
>
>HI ALL, in cleaning out a box of cables from a SK I
>found a three foot
>cable with 5 pin DIN 
>
>connectors on each end.  He had a Kenwood TS-940
>and a computer.
>
>May this be the elusive programing cable??
>
>Jack i     K0EWU9 at juno.com
>
>
>------------------------------
>
>Message: 2
>Date: Sat, 9 Jun 2007 11:10:49 -0700
>From: Waldo Magnuson <magnuson at mac.com>
>Subject: [Hallicrafters] Off-subject question on
>telephones
>To: hallicrafters at mailman.qth.net
>Cc: Waldo Magnuson <magnuson at mac.com>
>Message-ID:
><C0D19B2A-16B4-11DC-AB39-00039315EF26 at mac.com>
>Content-Type: text/plain; charset=US-ASCII;
>format=flowed
>
>My daughter bought a c.1938 WE302 telephone.  The
>phone rang twice and 
>then the ringer coil opened up (too much voltage I
>guess).  Is there a 
>Hallicrafters person on the forum expert in
>telephones that could 
>contact me?  I'm thinking that maybe a couple of
>protection zener 
>diodes across the ringer coil could protect
>burn-out of a replacement 
>coil.	Thanks.
>73,  Skip  W7WGM
>
>
>
>------------------------------
>
>Message: 3
>Date: Sat, 9 Jun 2007 11:33:26 -0700
>From: Edward B Richards <zuu6k at juno.com>
>Subject: Re: [Hallicrafters] Off-subject question
>on telephones
>To: magnuson at mac.com
>Cc: magnuson at mac.com, hallicrafters at mailman.qth.net
>
>Message-ID: <20070609.113742.1444.1.zuu6k at juno.com>
>
>Content-Type: text/plain; charset=us-ascii
>
>How about a resistor in series with the ringer?
>Also, they use a
>capacitor in series with the ringer so it does not
>load the line voltage.
>How about a smaller capacitor?
>
>73 from Ed Richards K6UUZ
>Simi Valley, CA. Home of Air 
>Force 1 pavilion
> 
>On Sat, 9 Jun 2007 11:10:49 -0700 Waldo Magnuson
><magnuson at mac.com>
>writes:
>> My daughter bought a c.1938 WE302 telephone.  The
>phone rang twice 
>> and 
>> then the ringer coil opened up (too much voltage
>I guess).  Is there 
>> a 
>> Hallicrafters person on the forum expert in
>telephones that could 
>> contact me?	I'm thinking that maybe a couple of
>protection zener 
>> diodes across the ringer coil could protect
>burn-out of a 
>> replacement 
>> coil.  Thanks.
>> 73,	Skip  W7WGM
>> 
>>
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>> 
>> 
> 
>
>
>------------------------------
>
>Message: 4
>Date: Sat, 9 Jun 2007 23:12:33 -0700
>From: "Van K7VS" <wa7fab at cdsnet.net>
>Subject: [Hallicrafters] HV transformer buzzing! 
>Help Please
>To: <hallicrafters at mailman.qth.net>
>Message-ID:
><000c01c7ab26$64681c40$29308d4b at FAMILY2>
>Content-Type: text/plain; format=flowed;
>charset="iso-8859-1";
>	 reply-type=original
>
>I just finished tearing down and rebuilding a HV/LV
>supply for a Globe King
>500A.	Galvanized the chassis and repainted all the
>xfmrs.  Looks great,
>works great BUT the supply is buzzing quite loudly.
> I know it is coming
>from the HV supply on this deck.  LV supply quiet. 
>The buzz is there when I
>turn on the HV supply switch and become quite a bit
>louder when I load the
>HV supply down (loading and running the transmitter
>section).
>
>Any thoughts of what might cause this noise.  I
>don't think its any kind of
>arcing but a mechanical noise and probably around
>60 cycles...maybe.  It is
>low pitched.  This supply using a filament xfmr for
>the 866A retifiers, a
>350 ma choke and large High voltage transformer.  I
>know I have to isolate
>the noise to one of the xfmrs but then what do I
>do?  Any help/thoughts
>would be appreciated.
>
>Thanks much.  Van, K7VS
>
>PS.  Next step is to clean off the modulator deck,
>remove all the rust and
>rebuild it.  The RF is pretty clean but doing the
>same to it.  I fired up
>the transmitter section today and got 300+ watts
>into a dummy load thru bird
>wattmeter.  Pretty good for an old boy that
>probably hasn't been on the air
>for thirty or forty years with a very rusty
>modulation section and very
>rusty power supply deck that now looks like it just
>came out of the factory!
>HI HI.
>
>
>
>------------------------------
>
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>End of Hallicrafters Digest, Vol 41, Issue 12
>*********************************************
Ken Ketner
ARS KA5ELD (Extra Class) ARRL, RSGB, GQRP #809
		Personal Webpage: http://www.wyttynys.net
		Office Webpage: http://www.pragmaticism.net
Email:
	home:	ketner(at)arisbeassociates(dot)com
	office: kenneth(dot)ketner(at)ttu(dot)edu

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