In article ,
Eiron wrote:
Ok if you just wanted to listen to it. But the equalisation will be
wrong, and you'll lose the extreme bottom end. So I'd advise anyone
with 30 ips tapes to have them copied properly - since they are likely
to be of important stuff.

Just checked - an old copy of Wireless World had a DIY tape recorder
design with pre/de-emphasis time constants inversely proportional to the
tape speed. So the frequency response will be correct when playing back
at a different speed. (Dolby would still screw it up though.)

The use of Dolby B (domestic) would be very unusual at 30 ips. As really
would be Dolby A. The main use of 30 ips was to get the best noise figures
without any reduction systems - and even then they had other disadvantages.

But I'd point out that in all my years around pro analogue tape recorders
in broadcasting, I've never used a machine capable of 30 ips.

--
*If God dropped acid, would he see people?

Dave Plowman London SW
To e-mail, change noise into sound.