[Boatanchors] Eico 950B question

[J. Forster]

Good point, but why not just add a current limiting resistor in series w/
the wiper or a small AG Fast Blow fuse?

-John

===============


> Oops I accidentally hit send prematurely.  My unit had that pot fried when
> I got it which caused it to put very high voltages on caps even when the
> pot was set for low voltages because the ground was non-existent.   The
> 950b is a great bridge.   Brian wa5uek
>
> Sent from my iPhone
>
> On Jul 2, 2013, at 8:37 PM, Brian Harris <cosmophone at yahoo.com> wrote:
>
>> Richard,
>>
>> By now you realize the bridge is working as it should.  One to be
>> careful with is when you test large caps at higher voltages.   When you
>> are through with the test turn the voltage down slowly rather than
>> rapidly slamming it to zero because if you the cap will be discharging
>> into a very low resistance (the wiper to the ground end of the pot)
>> which will fry the end of the pot.
>>
>> Sent from my iPhone
>>
>> On Jul 2, 2013, at 7:38 PM, "Richard Knoppow" <1oldlens1 at ix.netcom.com>
>> wrote:
>>
>>>
>>> ----- Original Message ----- From: "Garey Barrell"
>>> <k4oah at mindspring.com>
>>> To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>; "Boatanchors"
>>> <Boatanchors at mailman.qth.net>
>>> Sent: Tuesday, July 02, 2013 1:16 PM
>>> Subject: Re: [Boatanchors] Eico 950B question
>>>
>>>
>>>> According to the manual, the bridge is operated on the '54 VAC'
>>>> winding of the transformer.Keep in mind that the smallest resistor
>>>> typically found in electronics of the day was a 1/2W.  If there is
>>>> more than 1/2W dissipation in test, then you probably should be
>>>> testing on another range!!  :-)
>>>>
>>>> 73, Garey - K4OAH
>>>> Glen Allen, VA
>>>>
>>>> Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
>>>> and TR-4/C Service Supplement CDs
>>>> <www.k4oah.com>
>>> Thanks to all who responded to this.  You have confirmed my analysis of
>>> the circuit.  I saw the 500 ohm resistor but have not checked it for
>>> value.  I think this box is just not meant for low dissipation
>>> resistors.  I mainly wanted to see if it was a decent capacitor checker
>>> and it seems to be.  It has a number of electrolytic caps in it that
>>> probably should be replaced.  I have no memory of where I got it but
>>> think it was given to me years ago by someone who was cleaning out
>>> their junk. To me nothing that will do its job is junk.
>>>
>>>
>>>
>>> --
>>> Richard Knoppow
>>> Los Angeles
>>> WB6KBL
>>> dickburk at ix.netcom.com
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