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Old 4th Apr 2020, 6:12 pm   #1
saxmaniac
Heptode
 
Join Date: Oct 2007
Location: Birmingham, West Midlands, UK.
Posts: 615
Default Tandberg model 15 bias adjustment

Hi folks
I've a problem with sibilance on speech recording on this. I'm trying to check bias level with just the aid of an oscilloscope.
It may not be possible to follow the procedure in the manual as the oscilloscope inputs isn't isolated from earth
I was wondering whether anyone has an alternative method such as a measurement at the rp head, and I could do with advice on correct level. Also, is the level adjustment made by the trimmers adjacent to the heads? Tweaking these seems to alter the frequency but not the amplitude
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