Re: [IRCA] Long-term Breakdown of the Sony SRF-59 Tuning Capacitor

["Karl J. Zuk" <karlzuk@xxxxxxxxxxx>]

I had the exact same experience with a unit considerably older.

Keep perspective: This is a $15 item. Enjoy the magic while you can (or don't change frequencies!)

Karl Zuk  N2KZ






> From: D1028Gary@xxxxxxx
> Date: Tue, 21 Apr 2009 12:24:53 -0400
> To: ultralightdx@xxxxxxxxxxxxxxx; irca@xxxxxxxxxxxxxxxx; am@xxxxxxxxxxx
> Subject: [IRCA] Long-term Breakdown of the Sony SRF-59 Tuning Capacitor
> 
> Hello All,
>  
> A problem that presented itself occasionally among new SRF-59 units in late 
>  2007 has now, unfortunately, become somewhat of an epidemic.
>  
> The "scratchy tuner" problem was originally observed in about 10% of new  
> SRF-59 units in late 2007, which is caused by the breakdown of the dielectric 
>  material inside the tuning capacitor. The problem only was evident when 
> the  SRF-59 was tuned on AM, especially when tuned quickly from one side of 
> the band  to the other.
>  
> Evidence now strongly indicates that this SRF-59 issue is congenital, due  
> to a low quality tuning capacitor used by Sony to cut manufacturing costs. 
> My  original three SRF-59 units from late 2007 were all free of this problem 
> when  purchased and aligned, but all three have now developed the "scratchy  
> tuner." This includes the unit which received JOAK-594, JOIB-747 and 
> HLCA-972 in  November of 2007, which motivated me to write the SRF-59 review. 
> Apparently over  a period of several years, the SRF-59 tuner component 
> inevitably breaks  down
>  
> The Sony SRF-39FP and other Sony analog CXA1129N IC chip-based radios  
> apparently do not have this tuning capacitor issue, due to a higher quality  
> tuner component used in manufacturing. For those with an SRF-59 enjoying  great 
> DX, you may wish to secure one of these other Sony analog units for a  
> backup.
>  
> 73, Gary DeBock
>  
>  
>  
>  
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