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Author Topic: EQ in usec for both switches (NAB and IEC)??  (Read 2029 times)

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Offline tomdellomo

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EQ in usec for both switches (NAB and IEC)??
« on: May 09, 2014, 03:34:50 AM »
Guys:

I have recently bought the Eros tape head and am having my RS 1500 worked on locally. I still like to use the recording function on the machine at 15 ips. My repairman bombards me with technical questions that I am constantly unable to handle.


Does anyone know what this means or what the answer is:

If you want IEC 35 usec, then the record needs to modified to work with IEC play EQ.  It is now NAB.  Both the bass EQ and the treble EQ need to be changed in the record amp.
 
Find what EQ is in usec (bass and treble) for both switch positions (IEC and NAB).
 
Strange that the owners manual does not state that.  There are many different IEC and NAB standards.

 

Any help is greatly appreciated. I've gone down the rabbit hole...

Offline Doc B.

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Re: EQ in usec for both switches (NAB and IEC)??
« Reply #1 on: May 09, 2014, 04:54:40 AM »
We use the standard NAB and IEC/CCIR curves for 15ips, with a LF rolloff of 17Hz for IEC.
Dan "Doc B." Schmalle
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Bottlehead Corp.

Offline tomdellomo

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Re: EQ in usec for both switches (NAB and IEC)??
« Reply #2 on: May 11, 2014, 02:49:05 AM »
Thanks Doc --

So just for clarification, the Eros has 3183 usec bass EQ in the NAB switch position?


Thanks for the help as always!


Tom

Online Paul Joppa

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Re: EQ in usec for both switches (NAB and IEC)??
« Reply #3 on: May 11, 2014, 10:48:26 AM »
Yes, that is the NAB spec.
Paul Joppa