[ARC5] BC-348-Q Capacitor Testing

[John Hutchins]

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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>