[ARC5] BC-348-Q Capacitor Testing

[Rich Post]

My experience with the metal-clad caps in the BC-348Q also showed no need
to replace them.. The internal Hallicrafters power supply for the set made
for the Navy specified B+ at 245 volts and 60 mA.  Hallicrafters schematic
at this link

<http://www.ohio.edu/people/postr/bapix/BC348Q_3.htm>

Rich KB8TAD

On Fri, Jan 29, 2016 at 9:09 PM, John Hutchins <jphutch60bj at gmail.com>
wrote:

> Mark, Sudipta
> Please Note the oil filled cans can be unsolder'ed drained of oil, and
> re-stuffed with modern mylar capacitors. And then remounted.
> Done that with my receivers.
> Hutch
>
>
>
> On 1/29/2016 6:47 PM, Sudipta Ghose wrote:
>
>> This mail is very helpful to me. I have only an oil-filled capacitor
>> that I have not replaced in my BC348N.
>> Now armed with the data about the input current requirement it will be
>> a smooth affair.
>> Regards,
>> Sudipta Ghose VU2UT
>>
>> On Sat, Jan 30, 2016 at 5:56 AM, Robert  Eleazer <releazer at earthlink.net>
>> wrote:
>>
>>> First thing to do is to check the current drain with the receiver powered
>>> up.  I have a BC-348N that had a AC power supply installed exactly per
>>> the
>>> Surplus Conversion handbook.  Fortunately, the owner did no more than
>>> that,
>>> even using the ON-Off-MVC- AVC switch as the AC power switch and even
>>> leaving the dial light dimming control intact although disconnected.
>>>
>>> After confirming that the receiver worked I rebuilt the power supply,
>>> removing the dynamotor plate it was using and replacing it with a 1/8 in
>>> thick piece of AL.  I added some resistors to the AC line and B+ line to
>>> get
>>> the B+ down to 200VDC (the Surplus Conversion Handbook has you use a 300V
>>> transformer) and added an in-line AC switch to keep from having to use
>>> the
>>> MVC-AVC switch.  Current drain is about 60 ma and I have left all the
>>> caps
>>> untouched except for the ones in the power supply.  If your B+ current
>>> drain
>>> either on an AC supply or the dynamotor is more than 60ma you should look
>>> for possible cap leakage.
>>>
>>> Wayne
>>> WB5WSV
>>>
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>>
>>
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