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Old 24th October 2012, 08:34 PM   #11
Salas is online now Salas  Greece
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page 26 rather in reader count. You never nail for all recorders. Response Curves of Analog Recorders It takes fine tuning with favorite tape and FFT.
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Old 25th October 2012, 01:05 AM   #12
paulb is offline paulb  Canada
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page 26 rather in reader count. ..
I didn't include the accursed TI cover sheet.
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Old 25th October 2012, 01:15 AM   #13
Salas is online now Salas  Greece
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NatSemi assimilation, an end of analog era in its own part...
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Old 25th October 2012, 06:13 PM   #14
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Thankx to all you guys.

Just a small detail I'm not that hardcore in electronics, so something simple would be the best.
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Old 25th October 2012, 06:39 PM   #15
studeb is offline studeb  United States
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look for a prebuilt kit and contact teh designer about modifying the eq.
you will also have to decide which curve to use.
IEC or NAB?
3.75, 7.5 or 15ips?
Also what deck are you using?
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Old 25th October 2012, 10:47 PM   #16
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I know the Harman/Kardon Citation I preamp had that capability; also the Dynaco PAS preamp could be wired for tape head amplification. Schematics for these are all over the web. The Citations are scarce and expensive; the Dynacos are not. Good luck!
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Old 26th October 2012, 06:10 AM   #17
Salas is online now Salas  Greece
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Originally Posted by aantunes View Post
Thankx to all you guys.

Just a small detail I'm not that hardcore in electronics, so something simple would be the best.
Not as difficult to build as with tubes the JFET circuits and dead easy the National Semiconductor OP-AMP one. I have revised the NAB example BTW.
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Old 26th October 2012, 07:12 AM   #18
miklos is offline miklos  Canada
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You make me feel short and green with flipping ears like Yoda.

I used 5mH lower impedance later heads assumption, and about 350R source resistance. The input does not care but the heads may care, hence the trimming load addition. Good multi-turn trimmers in the passive EQ section (R4 HF) and R10 for gain. Very sensitive in the IEC for R4, see how it goes for 85R example.

P.S. Its only a theoretical exercise remember, it should take some work from here when with the real reel beast at hand. Don't know for peak overload for instance.
5mH, isn't to low for a PB head?
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Old 26th October 2012, 07:43 AM   #19
Salas is online now Salas  Greece
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Have read in a Manley manual 2mH to 10mH for most heads in solid state decks.
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Old 26th October 2012, 07:57 AM   #20
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Just a small detail I'm not that hardcore in electronics....
Why not learning from the Master? Mr. John Curl, a leading expert in the field of tape recorder electronics, is a member of this forum. Try to contact him.
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Have read in a Manley manual 2mH to 10mH for most heads in solid state decks.
On x-pro's site you'll find some values for cassette tape recorder heads.
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