Eros with Flux magnetics ER head

  • Thread starter Thread starter ALEXZ
  • Start date Start date
Flux/Eros part2.
This time I am 100% sure I'm not measuring my scope bandwidth. I tested scope with audio oscillator with calibrated output and freshly calibrated fluke 87. No issues at list up 50khz.
Tape is MRL 21J203 medium hot (250nW/m) IEC test tape.
Cables are replaced with the shrt jumpers from technics to Eros.
Everything perfectly flat from 125 hz upto 12,500.  16khz +2dB,  20khz +4.5 dB
Not that it is bugging my in any miningfull way. I just want to know, where is this coming from ?
Thank you,
Alex

PS. Could it be a crosstalk? On the higher frequencies coil reads its own signal plus a bit of neighbor's. Can stereo head acts like a transformer  in a way ?
 
Have you readjusted the input resistance of the preamp since you changed cables? If not, try lowering it a bit.
 
Aha. I did not re-adjust input resisters with the new cables. Ill try, that's probably it.
I guess my crosstalk theory is not a moment of enlightment... Oh well...next time.
 
Thank you, Dan. Got it right this time, everything above 125 hz nicely flat and a bit of low end bump as expected.  BTW my readings of 30hz from MRL tape and TP tape are a bit more then 2dB apart, TP is lower one.  Everything else is identical.
 
TP tape is two track.  MRL - I don't know, but will find out. MRL documentation stated that tape is not fringing compensated.
On another topic: what are the recommendations to calibrate NAB with IEC tape ? I've printed "translation" table from MRL site. Are there any gatchas ?
Thank you,
Alex
 
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