Hey folks,
I got three V76 input transformers BV511. They came from a spare department of a radio station as far as I now. So they should be unused.
One of them works like a charm and is flat from 10 Hz to almost 50 KHz...
The other two have low end loss. Top end seems to be ok. When looking at an oscilloscope with two probes in "differential mode" the low end drop starts at around 300Hz. But is flat to almost 45Khz.
I also have a Psophometer (AC voltmeter 15Hz - 100KHz) and there it's even weirder. It's flat from only 10khz to around 25khz. Signal drops fast under 10khz.
Thought it could be the infamous magnetization problem and tried to demag it with a 3v 30Hz signal slowly decreasing level but that didn't work.
Does anybody have a clue what the problem could be?
I got three V76 input transformers BV511. They came from a spare department of a radio station as far as I now. So they should be unused.
One of them works like a charm and is flat from 10 Hz to almost 50 KHz...
The other two have low end loss. Top end seems to be ok. When looking at an oscilloscope with two probes in "differential mode" the low end drop starts at around 300Hz. But is flat to almost 45Khz.
I also have a Psophometer (AC voltmeter 15Hz - 100KHz) and there it's even weirder. It's flat from only 10khz to around 25khz. Signal drops fast under 10khz.
Thought it could be the infamous magnetization problem and tried to demag it with a 3v 30Hz signal slowly decreasing level but that didn't work.
Does anybody have a clue what the problem could be?