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Old 19th June 2012, 08:20 PM   #1
tmblack is offline tmblack  United Kingdom
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Default 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?
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Old 20th June 2012, 07:30 PM   #2
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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
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Old 20th June 2012, 10:13 PM   #3
tmblack is offline tmblack  United Kingdom
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Will need to work out the IEC filter characteristics.
Seems a discrete opamp would work.
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Old 20th June 2012, 10:23 PM   #4
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There are examples of tape preamps done with opamps.
Saw them via Google.
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Old 21st June 2012, 12:05 AM   #5
labjr is offline labjr  United States
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Tape preamp can probably be done with DSP too.
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Old 25th June 2012, 04:17 PM   #6
tmblack is offline tmblack  United Kingdom
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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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