[time-nuts] FTS 1200 transistor replacement

Bob Camp kb8tq at n1k.org
Sat May 17 20:50:51 UTC 2014


The 2N5089 from ON semi is a pretty good bet for a high beta / audio part. They are $0.37 a piece from Mouser with 11,542 in stock.


On May 17, 2014, at 11:37 AM, EWKehren at aol.com wrote:

> Traced the problem of my FTS 1200 to the first BC109 Transistor on the  
> A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor 
> low  noise is critical. This unit is at least 30 years old and my question is, 
> what  transistor will have even lower noise than the than low noise BC 109. 
> Voltage is  6.43 V.
> Thanks  Bert Kehren
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