[ARC5] BC-348 Resistors

[scottjohnson1 at cox.net]

I will say this for the Nth time-

Humidity x temperature = accelerated failure of composition resistors and molded capacitors

Temperature and humidity swings enable ingress of moisture.

If you want your boat anchors to last longer, move to a cool dry climate!

(Or pack them like the military does, in foil bags with desiccant)

Old age doesn’t directly cause failures, the working environment does

That’s why Voyager is still transmitting (I think)

 

 

 

Scott

 

From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of jphutch60bj
Sent: Wednesday, March 27, 2024 13:05
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] BC-348 Resistors

 

In my opinion it depends greatly on how the radio, was / is, stored.   I have 1 BC-348R that does not have a cap or resistor replaced.  Stored in doors all the 25+ years I have had it.  Not sure about it's past history.   If I recall correctly, it was an early E-Bay purchase. 

On 3/27/2024 1:29 PM, k2cby at optonline.net <mailto:k2cby at optonline.net>  wrote:

My experience rebuilding a BC-348R was that almost all the “Micamold” capacitors leaked like sieves – far worse problem than off-spec resistors! 

 

Miles B. Anderson, K2CBY
16 Round Pond Lane
Sag Harbor, New York 11963-3821
Phone: (631) 725-4400
FAX: (631) 725-2223

e-mail: k2cby at optimum.net <mailto:k2cby at optimum.net> 

 





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