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

[D1028Gary@xxxxxxx]

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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