A75 front-end collapsed

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Dear All,

Just report to the error of my A75 front end, the root cause was incurred by my toy signal generator. I was used it as an input signal, before amplification measured from input the signal seems OK. However, after amplification most conspicuous phantom and unstable waveform output can be observed.
Eventually, I borrowed one best signal generator from my friend, a very pretty and clear output to be presented by it.

Thanks for all your help!
CK
 
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