EQ circuit testing
Would anyone be able to interpret the following test results for me?
I am suspicious that there is something wrong with the EQ circuit in my Tandberg 12 so I've been doing a bit of testing with an oscilloscope. I input a 2kHz sine to the inputs and traced it through to the recording head.
There is an initial recording pre-amplifier section which looked fine. I then took a trace at the output of the recording EQ (just before the recording current trim pot) and got the trace attached.
The trace shows a pulse shape. Is this normal or does this show a problem with the EQ circuit? Was it wrong to expect to still see a sign wave?
Any input greatly appreciated.
|