HP 7907 read preamp question

Chuck Guzis cclist at sydex.com
Sat Oct 21 00:43:47 CDT 2017

On 10/19/2017 05:00 PM, Jon Elson wrote:
> On 10/19/2017 06:44 PM, Chuck Guzis via cctalk wrote:

>> My question for those knowledgeable with this drive is what's the
>> downside of adjusting the gain to create an output of, say, 7V P-P?
> Well, you might have to turn it back down for newly recorded tapes. But,
> if you are using it only for recovery of old data, maybe no downside at
> all.
> But, there are so many defects in old tapes.  There's print-through,
> wrinkles from the tape pack scrunching, weave, oxide flaking, dirt
> buildup, and maybe some others.

No, it turns out the answer is to set the preamp gain at spec.  It
appears to do nothing but create more problems if turned up higher than

It was worth a try.


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