[Hammarlund] Re: [Boatanchors] Resistance values of power supplychokes.

[Russ WQ3X]

Great info on the chokes Rod.

I would still suspect those PS filter caps. Maybe try substituting others 
just tacked on from your junkbox just to eliminate them as culprits. 
Capacitance meters are OK for small stuff but I like to use an ESR meter and 
also a megger to really test electrolytic caps. How much AC ripple are you 
seeing on the B+ out of the last filter choke?

73 and good luck with it. Be sure to let the list know your results. Too 
cold in the garage here in PA to play Mr. Fixit so have to hang on other's 
adventures. I have an SP-600 panel and bezels off to paint.

Russ WQ3X





----- Original Message ----- 
From: "Revcom Electronics" <revcom at wbsnet.org>
To: "Ken Hickman" <n5cm at rtconline.com>; <hammarlund at mailman.qth.net>; 
<boatanchors at theporch.com>; <boatanchors at mailman.qth.net>
Sent: Wednesday, February 14, 2007 10:59 AM
Subject: [Hammarlund] Re: [Boatanchors] Resistance values of power 
supplychokes.


> Ken...
> This was on the thread a couple years ago...
>
> L21 choke, .097A  270ohms, 16H
> L22 choke, .055A  900ohms, 35H
>
> Info from Sam's No. -8-
> Sounds like your's very close to spec.
>
> You may have a shorted audio output causing
> high current draw, or??. Is that  noise affected
> by the volume control?
>
> Rod
> K0EQH
>
> ----- Original Message -----
> From: "Ken Hickman" <n5cm at rtconline.com>
> To: <hammarlund at mailman.qth.net>; <boatanchors at theporch.com>;
> <boatanchors at mailman.qth.net>
> Sent: Tuesday, February 13, 2007 10:43 AM
> Subject: [Boatanchors] Resistance values of power supply chokes.
>
>
>> Hi Gang,
>>
>> Does anyone know what the restance is of L21 and L22 power supply chokes
> of
>> the
>> Hammarlund HQ-129-X? The schematic and parts list doesn't give the Henrys
>> nor
>> the resistances.
>> I've had both  chokes rewound and one is 15 Henrys and measures 190 ohms
> on
>> a
>> Eico Model 221 VTVM.
>> The other one is 35 Henrys and measures 1000 ohms.
>> My Sencore "Z" meters only measures to 10 Henrys so no luck there in
>> confirming
>> whether the chokes are still good.
>>
>> Problem is a loud hum or horn sound and the three 10 Mfd. 450V condensers
>> all
>> come thru with flying colors on both the "Z" meter and the N.R.I. R/C
>> Tester.
>>
>> My next effort will be to substitute another audio output transformer 
>> (for
>> the
>> original in the rcvr). I have the one I salvaged from my first 129-X 
>> which
> I
>> parted
>> out a couple of years ago.
>>
>> I am still open to any ideas or suggestions. I am too stubborn to give 
>> up!
>> Take care,
>>
>> Ken  N5CM
>>
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>>
>>
>
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