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-   -   What Would A NP Tape Preamp Look Like? (http://www.diyaudio.com/forums/pass-labs/214777-what-would-np-tape-preamp-look-like.html)

tmblack 19th June 2012 08:20 PM

What Would A NP Tape Preamp Look Like?
 
Just getting back to reel and reels but the electronics are shot.
What would a Nelson Pass circuit look like if he was to build a repo amp from scratch?

vdi_nenna 20th June 2012 07:30 PM

Would look like a 50 db gain phono preamp, but the RIAA would be changed to a NAB or IEC or other curve.

Question : stereo tape head preamp

http://laocaudiosociety.net/tech/NABtoIEC.pdf

Tape Head March 2007

tmblack 20th June 2012 10:13 PM

Will need to work out the IEC filter characteristics.
Seems a discrete opamp would work.

vdi_nenna 20th June 2012 10:23 PM

There are examples of tape preamps done with opamps.
Saw them via Google.

labjr 21st June 2012 12:05 AM

Tape preamp can probably be done with DSP too.

tmblack 25th June 2012 04:17 PM

Problem with using opamps is they are too noisy.
The tape head in not unlike a MC cartridge.
I would expect a signal output of 0.4mV and impedance rising from 400 to over 15k ohms at high freqs.
So we can choice a pre preamp.
Should it be tube, BJT or FET?


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