[time-nuts] Any HP8561B Experts out there

[Martyn Smith]

Hello,

I just bought a HP8561B on ebay but it has a few faults.

1.  The unit powers up and basically operates ok.  But after a while, it 
turns off, turns back on, goes through the start sequence, and then stays on 
for a few minutes and turns off again.  It cycles through this.
2.  Sometimes at some settings it does stay on for a while (20 mins) other 
times it justs keeps re-booting.
3.  The frequency response also falls off below 1 MHz, to -40 down at 1 kHz. 
I assume this is the first mixer.

Any one have any ideas before I waste $600 in shipping costs and send it 
back to the US (I'm in the UK).

Regards

Martyn