Re: vintage disk drive dilema - to modify or not to modify

[Patrick Schaefer <pa.schaefer@web.de>]

Mike Willegal schrieb:

>       I suspect that I could improve this drives performace by 
> increasing the resitance in the peak detection delay circuit to the 
> standard that was used in later disk drives.  Most likely adding a 3k 
> reistor in series with R21 would do the job.  

This increases the time constant of the first monoflop. In my schematic, 
it's 9k1 / 330pF. Is this the 'original' value, or the new one you want 
to achieve with your modification?

The datasheet values are 6k4 / 200pF.


Patrick



BTW: I would store the vintage drive at a safe place and use something 
less valuable for daily work...