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Author Topic: Speed Question  (Read 3582 times)

Offline jcmusic

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Speed Question
« on: October 27, 2009, 03:18:25 PM »
What speed would a r2r be using to equal 33.3 of a tt?

Jay
Redpoint Model D TT/Soundsmith Sotto Voce Cartridge Otari MX 5050 BII/BH Tube Repro deHavilland Model 222
 Ah Njoe Tjoeb 4000, Rogue Magnum 99, Korneff 45 SET Amp, Klipsch K-Horns Bass Bins/2" Tractrix Horns 2" BMS Drivers, Vintage Tubes.

Offline steveidosound

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Re: Speed Question
« Reply #1 on: October 27, 2009, 07:56:40 PM »
What speed would a r2r be using to equal 33.3 of a tt?

Jay

Not sure I understand the question. What speed is equivalent in quality? Depends on a lot of things but for copying a record probably 7 1/2 is good enough.
What is the same media linear velocity? That changes with where you are on the record.
When does the reel speed equal 33 1/3 RPM?
Steve Williams

you don't want to know what equipment I listen to...

Offline Ben

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Re: Speed Question
« Reply #2 on: October 27, 2009, 09:21:09 PM »
Looking at the R2R playing, about 1/2 way through on a 7' reel
7.5 IPS it looks like the reel speed is 30 RPM. :)
Off hand I think the -3DB is 18 Khz for 7 1/2' and 20 Khz for 15 ips,
but your R2R manual should give the details.
Listening to a Decca tape - enhanced for stereotape ( no year )
Golden Favorites - The Orginal Ink Spots, with a New Amp/Pre-amp
and they sound really good. I think I would have a less fidelity, or mono recording with good sound, that poor CD copy of a better known pressing.
I am finding about 3%  of CD's just don't make the grade for quality they could have.
Ben.

 

Set 45,Open baffle speakers,Otari 5050,,Pioneer DV-79AVi DVD/CD/SCAD player

Offline PJ

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Re: Speed Question
« Reply #3 on: October 29, 2009, 02:30:53 PM »
...Off hand I think the -3DB is 18 Khz for 7 1/2' and 20 Khz for 15 ips, ...
I'm sure you're right in many realistic cases, but theoretically (i.e. with the same head gap and a low enough head capacitance) you should be able to get another octave at twice the tape speed.
Paul Joppa
Bottlehead R&D

Offline Ben

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Re: Speed Question
« Reply #4 on: October 29, 2009, 06:20:37 PM »
I suspect it is the Recording Head rather than the playback head that
would give the absolute limit of freq response and linear response.
Set 45,Open baffle speakers,Otari 5050,,Pioneer DV-79AVi DVD/CD/SCAD player