| The 253 uses a non-volatile RAM, an X2404P.  According to Ten Tec this 
type of RAM has a finite number of times it can be written to. They told 
me it would take about 10,000 settings to fill up!  I can't imagine that 
ever happening in practice but it happened to mine.  I was not the 
original owner of the tuner so I have no idea how it was used before I 
got it. 
73,
Puck, W4PM
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