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Old 20th February 2008, 07:26 PM   #11
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Ok, I slapped together a crude tape transport and Set up a few tape heads on it. Both heads work but I'm not able to record anything on the tape. Basically, what I did was run a guitar through an amplifier on to the tape head. Is there some special trickery needed for this?
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Old 20th February 2008, 07:35 PM   #12
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Update. I cranked up the amps and I can make out the lyrics to funkytown now. There's just absolutely no bass.

I'll try again tomorrow with a phono preamp after the playback head.
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Old 21st February 2008, 06:26 AM   #13
Limhes is offline Limhes  Orkney Islands
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Have you been biasing the signal after all? As it seems not, and that's what you should. Too much hysteresis at the magnetization of the tape, if you'd read the article . Just make some 100kHz carrier and AM modulate your signal onto it. Write that on the tape, and you're set..
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Old 21st February 2008, 10:11 AM   #14
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I did read the bit about biasing but, for some reason, decided to try without it anyway.

Any ideas on a simple sine-wave generator? Would a Wien bridge oscillator work?
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Old 22nd February 2008, 04:52 AM   #15
Limhes is offline Limhes  Orkney Islands
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Would be just fine. Then add a summing network after it to sum bias signal and audio signal, using for example an inverting opamp with two input nodes. You can match all levels using this opamp, changing the three resistors. Attach its output to the write head and you're ready, I'd think...
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Old 22nd February 2008, 05:50 AM   #16
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If I read you correctly, you are looking for something similar to what Sam Phillips did at Sun in the mid-50s. "Slapback" echo for Rockabilly was obtained by using two of the early Ampex tape machines. I caught this on a cable documentary. Perhaps some research into early Sun equipment will help.



Mark
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Old 22nd February 2008, 06:07 AM   #17
el`Ol is offline el`Ol  Germany
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I ask myself whether the edge of an old 5 1/4" hard disc would be long enough for the task.

BTW,
all the big names have delays for 100, was there really nothing for you?

A bit more expensive, but much more than a delay (and analog filters in the feedback!):
http://www.jomox.de/product_details....=&product_id=3

Maybe you like the guitar demo sounds.
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