How good is your reel to reel machines frequency response ?

HDVS

Well-Known Member
May 20, 2014
25
1
233
Italy
I know that technical review. I've written many times to Jack to share some measurements I've taken on some recorders but I never got a reply.

This is my little contribution consisting in frequency response measurements performed on some 1/4" studio recorders (two track DIN or NAB head layout) after being refurbished and running at 15 IPS with CCIR eq and 320nWb/m flux with SM900 or GP9 tape:

Studer A812
http://oi57.tinypic.com/2mwhw90.jpg

Otari MTR15 (DIN format). The faint curve, with low end rolloff, showing 30 IPS speed.
http://oi57.tinypic.com/fegb5s.jpg

Nagra T
http://oi60.tinypic.com/n5l9n9.jpg

Lyrec PTR-1 (Frida)
http://oi60.tinypic.com/288ow0w.jpg
http://oi61.tinypic.com/72ak5c.jpg


I have many other results but have to find pictures... Will post them to time when they'll come to my hands.
 

MylesBAstor

Well-Known Member
Apr 20, 2010
11,236
81
1,725
New York City
I know that technical review. I've written many times to Jack to share some measurements I've taken on some recorders but I never got a reply.

This is my little contribution consisting in frequency response measurements performed on some 1/4" studio recorders (two track DIN or NAB head layout) after being refurbished and running at 15 IPS with CCIR eq and 320nWb/m flux with SM900 or GP9 tape:

Studer A812
http://oi57.tinypic.com/2mwhw90.jpg

Otari MTR15 (DIN format). The faint curve, with low end rolloff, showing 30 IPS speed.
http://oi57.tinypic.com/fegb5s.jpg

Nagra T
http://oi60.tinypic.com/n5l9n9.jpg

Lyrec PTR-1 (Frida)
http://oi60.tinypic.com/288ow0w.jpg
http://oi61.tinypic.com/72ak5c.jpg


I have many other results but have to find pictures... Will post them to time when they'll come to my hands.

That Studer as well as the others are damn impressive!
 

Asamel

Well-Known Member
Jan 22, 2012
578
1
263
Philly
So now I need a 1 inch machine? Will someone explain that to my wife, I'm afraid.
 

MylesBAstor

Well-Known Member
Apr 20, 2010
11,236
81
1,725
New York City

Obviously someone didn't bother to read John Curl's paper and the meaningless of THD and IMD. Maybe we could also get a graph of the harmonic spray too.
 

R2R

New Member
Mar 1, 2012
9
0
0
USA
HDVS,I saw your video of the Otari MTR-15 on the tube. I have a few on them, They are very nice!
 

HDVS

Well-Known Member
May 20, 2014
25
1
233
Italy
Nice work HDVS! Do you have THD and IMD results as well?

Unfortunately I didn't take pictures of all the measured parameters. The recorders are gone now, together with their technical sheets.
Anyway I've those pictures related to a sweep of the THD+N (way higher than THD alone) of a Studer A812 MkII taken without and with HX Pro in the recording chain:

http://oi54.tinypic.com/15zjq6d.jpg
http://oi53.tinypic.com/nxl151.jpg

Here you find an FFT with a modulation signal of 10 KHz at 0 dB and the square wave response at 10 KHz:

http://oi62.tinypic.com/102v3w8.jpg

And this is x-talk + phase response of the same recorder:

http://oi59.tinypic.com/jgpeo3.jpg

This is of the recently refurbished Studer A80 1" 2 channel (sorry for the bad focus):

http://oi61.tinypic.com/30aqa7o.jpg


For the Frida:

THD + N
http://i49.tinypic.com/34g6bk2.jpg

SNR for 1% THD
http://i45.tinypic.com/xfre9s.jpg
 

HDVS

Well-Known Member
May 20, 2014
25
1
233
Italy

HDVS

Well-Known Member
May 20, 2014
25
1
233
Italy

c1ferrari

Member Sponsor & WBF Founding Member
May 15, 2010
2,162
51
1,770
I'll play :p
Can you furnish a hint :confused:
 

HDVS

Well-Known Member
May 20, 2014
25
1
233
Italy
Of course!

It was named several times in this thread ;)
 

c1ferrari

Member Sponsor & WBF Founding Member
May 15, 2010
2,162
51
1,770
Okay :D
I'll hazard Studer A812 :cool:
 

HDVS

Well-Known Member
May 20, 2014
25
1
233
Italy
No, it's not a Studer!

Now it's rather late here in Italy, I'll come back tomorrow.

Make no mistake the next answer ;)
 

c1ferrari

Member Sponsor & WBF Founding Member
May 15, 2010
2,162
51
1,770
Rats :cool:
I'll cogitate further upon the matter ;)
 

c1ferrari

Member Sponsor & WBF Founding Member
May 15, 2010
2,162
51
1,770
Oh, could very well be, R2R :)
 

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