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2nd November 2008, 08:24 PM
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#1 |
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diyAudio Member
Join Date: Dec 2003
Location: xxxxx
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tape head amplifier
Hi!
I have an old reel-to-reel home recorder (late 60s). I would like to record some tapes to PC maintaining the highest quality. Since it has valve amplifier, I think the best way to get the signal is right at head output before any kind of signal amplification. The question is: can I do a good tape head amplifier using only an opamp? If yes, how? I would not like to buy a tape head amplifier IC until necessary. |
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4th November 2008, 12:48 PM
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#2 |
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diyAudio Member
Join Date: Aug 2004
Location: Ratae Coritanorum
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hi David,
it is possible to construct a tape head pre amp, however this is not a straight foward job, the pre amp has to have tape EQ compensation and there are a few different specifications for this. this along with the low noise and small signals involved make it quite a job. how is the sound of the machine you have?
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regards bob |
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4th November 2008, 02:29 PM
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#4 |
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diyAudio Member
Join Date: Sep 2003
Location: Midland, Michigan
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You'll need a wide bandwidth chip which can also provide high gain. You might want to try a chip which is often used for video ... perhaps something like an AD847JN.
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Frank |
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4th November 2008, 04:25 PM
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#6 |
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diyAudio Member
Join Date: Mar 2004
Location: Budapest, Hungary
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I doubt if it is possible to build a better sounding (not better specs) playback amplifier than the original valve amp. What is the problem with it? The only one I can imagine is hum and it can be cured.
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4th November 2008, 04:38 PM
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#7 |
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diyAudio Member
Join Date: Feb 2006
Location: Vancouver
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A tape head amplifier is very similar to a phono preamp. It just uses a different equalization curve. They use to be very common at one point. Even the old Dynaco PAS3 had one. The equalization can be done passively or actively like RIAA in a phono preamp. Below are a couple articles about building them.
http://www.bottlehead.com/et/adobesp...headpreamp.htm http://www.stiftsbogtrykkeriet.dk/~mcs/index.html |
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11th November 2008, 01:59 PM
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#8 | |
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diyAudio Member
Join Date: Sep 2003
Location: Midland, Michigan
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Quote:
Wideband so you can gets lots of gain from a single chip and not attenuate the highest audio frequencies.
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Frank |
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