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Again with analog tape issues...

Discussion in 'Recording' started by Cosme, Oct 29, 2007.

  1. Cosme

    Cosme Guest

    Hi, well I wanted to try out the analog tape experiment, so I went out and bought a Tascam 32 1/4" reel to reel mastering analog tape machine and started experimenting. Oh my god it's so perfect! In all my 4 or 5 years of experience recording in the digital domain I've never EVER come across this type of sound, it's like having human ears as a recording system, I couldn't understand it! Now I totally believe now that analog recording is an essential part of the profesional recording process, but It's sure that digital mixing and editing is totally necessary as well. Of course in the experiments I made I was listening directly through the headphone outputs of the Tascam machine, so here's my question... If you track in analog and then import into digital (for example Cubase SX in 32bit), will this process affect my beautiful analog signal in a negative way? if so, how? and how can I work around it?
  2. RemyRAD

    RemyRAD Guest

    Hi, Cosme!

    In many ways, listening to analog tape playback is much more like listening to the output of your console than the output of a CD. Like riding in a Rolls Royce! In spite of the tape noise, wow & flutter and analog tape's nonlinearities, there isn't any detrimental filtering. It's that lower sample rate of 44.1kHz and 20kHz brick wall filter that makes digital sound like digital and not like analog. But starting with that analog sound, you get to capture THAT flavor before the horrific brick wall filtering. So analog, transferred to digital, sounds more like analog than a pure digital production. Just listen to all of those hits from the 1970s and eighties, which were later transferred to CDs. You still get that analog glow.

    In the land of digital recording, you will approach a more acceptable analog like quality by recording at the higher sample rates of 88.2, 96 and 192kHz. That's because with every incremental advance, the brick wall filter can be moved to a higher frequency. Rendering its adverse effects less audible in the perceptible bandpass. But you get shoved right back to go again when down sampling for CD, MP3, i-pods and pod casts at 44.1kHz sampling rate. Thankfully, you still retain that nonlinear saturated analog sound, along with the horrible brick wall filter.

    What I recommend to everybody is if you want that analog sound, don't record analog, rewind and playback. But actually monitor playback while recording and transfer to digital in real time. This will cut your wow & flutter by half. While also preventing "print through".

    Now, you didn't mention whether you purchased this machine new or used? Nor, did you indicate what type of tape you set the machine to record with? Analog machines are not like digital machines. And analog machine needs to be properly set up to the type of tape that you are recording upon. This is determined by both the tape manufacturer and the machine manufacturer, depending on bias frequency, head the gap and other factors. Plus, one needs to know whether they like the sound of peak bias or over bias. Both methods present different textures to the sound. One never really wants to under bias. And, if your bass guitar sounds like you recorded it while pouring gravel in the backyard, your bias settings are not optimized for lowest modulation noise. That's the trickiest adjustment of the record bias.

    And before one sets the record up, playback needs to be properly calibrated with the use of highly specialized reference calibration tapes and appropriate test gear. I've never recorded on an analog machine out-of-the-box. Aligning an analog machine is an art of science and compromise. Thankfully, you'll not have to align the 24 track analog machine for each session coming in and going out the door for each and every client. Those were the good old days. Or was that the gold ole days? And just remember, if you happen to get one of the playback alignment tapes, DO NOT ALIGN THE LOW-FREQUENCY PLAYBACK EQUALIZER'S TO THE PLAYBACK REFERENCE TEST TAPE. Those are to be aligned only when doing the recording to playback response. To align playback response, you only use the frequencies from 500 to 20,000. The low frequencies are only used in a mono, full track situation due to "fringing effect" on anything with more than a single channel, i.e. 2 or more. Otherwise, you will never be happy with the low frequency response on record to playback. A mistake I've seen way too many times by some actually very fine and educated engineers. A little-known information factoid that frequently had to be handed down from somebody who knows. Even to my engineering manager and chief engineer at NBC radio in Washington DC. Go figure? Thankfully, I'm a fossil.

    Stoned again
    Ms. Remy Ann David
  3. TVPostSound

    TVPostSound Guest

    My opinion:

    1K peak bias always sounded better on full range recordings like music.
    On television programs which much of everything under 80Hz was rolled off,
    10K 3 dB over bias worked very well.

    Dont forget about Azimuth, Wrap, and Zenith!!!!

    If you're a fossil, Im a dinosaur!!
  4. Cosme

    Cosme Guest


    Hi Remy, my machine is a Tascam 32 Mastering 1/4inch 2 track machine, it has the SYNC monitor option, I think that's the one that let's you hear what's being recorded in the record head through the output, should I track to digital in real time using that option?
  5. Cosme

    Cosme Guest


    Hi Remy, my machine is a Tascam 32 Mastering 1/4inch 2 track machine, it has the SYNC monitor option, I think that's the one that let's you hear what's being recorded in the record head through the output, should I track to digital in real time using that option?
  6. RemyRAD

    RemyRAD Guest

    Cosme, I think you will not want to monitor with the sync option engaged. This function is that of a multitrack recorder that allows playback through the record head, on an adjacent channel to another that you are recording upon. And, so, when engaged, playback through the record head makes it possible to add additional material to the adjacent track with full-time synchronization. You want to be in "repro" playback mode while recording. This is the setting that we use to monitor the recording after it has passed by the recording head and is then being picked up approximately 80 to 100 ms later (assuming one is recording at 15 IPS). The repro mode is also what we must use when aligning the record section, otherwise, record set up could not be done in real-time. This was a huge problem on the world's first low-cost 16 track 2 inch Scully model 100 recorder. A substantial cost savings was had by only supplying that machine with 2 heads. So on that machine, you were always playing back through the record head in "sel-sync" (selective synchronization) mode. It was fine if you were not always tweaking the machine's record electronics on a daily basis. Otherwise it was a dog to align as it could not be done in real-time.

    And of course, another highly educated person in the know has indicated that I had not said anything about physical head adjustments.

    Heads required numerous adjustments such as azimuth. This adjustment dictates the angle of the head gap. The head gap should ideally be exactly 90° perpendicular to the horizontal length of the tape. With a multitrack machine, such as a stereo on up to 24. When the azimuth is not correct, terrible phasing issues occur. This is because smaller high-frequency signals will be picked up a few microseconds apart. This sounds dog awful. No offense Davedog as we all know you are a quality engineer. And so Davedog is synonymous with quality as opposed to improper azimuth, which is the most commonly made of all head adjustments as height, Zenith, wrap are usually only acted upon with head replacements.

    Zenith is the adjustment of how flat and parallel the head is in relation to the tape. That is to say, if the head is angled back or forward, the top or the bottom of the head will receive greater uneven wear, since it is pushing into the tape unevenly. This can result in the head being worn out on the left track or track 1 and not worn badly on track 2 or, track 24, depending upon the machine type.

    Of course there are also height adjustments that when made, will also affect that Zenith adjustment.

    Then there is rap. Which is a bunch of guys with awful microphone technique. They should not be confused with wrap that, when also done incorrectly can disappoint your children at Christmastime. This too should not be confused with wrap which is the rotational alignment of the head gap to the tape traveling over the face of the head.

    All of these adjustments require the knowledge and dexterity akin to a watchmaker. Otherwise, no cigar.

    Thankfully, head technologies have changed over the years from the soft ferrous metals that were once used. To the almost indestructible ferrite glass faced heads in common use today. But those too can be damaged if improper head cleaning solutions are used. The best head cleaner is now no longer available and that was the refrigerant Freon. A completely inert, quickly evaporating, nonconductive, Dow developed chemical. In the absence of Freon, only 91% alcohol should be used. NOT 70% RUBBING ALCOHOL. That stuff contains other ingredients that's not really conducive to head cleaning.

    And then there's this important demagnetizing stuff. The erase and record heads are virtually self demagnetizing albeit not completely. The real problem occurs with the playback head. This is because the playback head is only designed to pick up extremely small magnetic fields and after a period of time and/or north to south traveling, the playback head gets magnetized. When it gets magnetized, it begins to wipe off high frequencies on the tape every time the tape passes by the head. So an external de-magnetizer needs to be utilized to de-magnetize the playback head on a regular basis. Especially, just prior to alignment with those expenses calibration tapes by companies like M. R. L. a.k.a. Magnetic Reference Laboratory and STL a.k.a. Standard Tape Laboratories and others that are lesser-known.

    I think I need to resurrect my old tape recorder alignment video that I made back in the early 1980s? This is where I described and demonstrate proper tape recorder maintenance and alignment. Not even sure if I even have that video anymore, which may necessitate my production of a new video?

    So, how many people here, would like to know proper analog tape recorder and maintenance procedures?

    I'm smoking my Montechristo Cuban cigar while waiting for your replies. I do that because it's sexy.
    Ms. Remy Ann David
  7. Jbrax

    Jbrax Guest

    ME ME ME!!!!!! :lol: :lol:
  8. bent

    bent No Bad Vibes! Well-Known Member

    Haha, reminds me of Tyrese, staring up at me acting like I was the ass that stuck his mic in his hand straight into his wedge during his show!!! :lol:
  9. Cosme

    Cosme Guest

    Wait a sec there's something I don't understand, how can you record in realtime monitoring through the repro option if there's a 100ms delay between the incoming signal and the outcoming signal? Specially if you're playing along with a previously recorded track
  10. Cosme

    Cosme Guest

    Wait a sec there's something I don't understand, how can you record in realtime monitoring through the repro option if there's a 100ms delay between the incoming signal and the outcoming signal? Specially if you're playing along with a previously recorded track
  11. bent

    bent No Bad Vibes! Well-Known Member

    The repro head is the "hi-fi" head.
    To be sure that your take is good in realtime you would want to monitor it.
    Any delay or monitoring latency between the two (1/10 of a second) can be dealt with via a DDL3 , 1030, or other such line delay.
  12. Cosme

    Cosme Guest

    That seems a little complicated I didn't quite get it, I should use a delay after the machine's output signal? Wouldn't that make the latency even longer?
  13. TVPostSound

    TVPostSound Guest


    Did you ever figure out who that guy was, on the MRL tape???

    Now that reminds me, you left out "Nanowebers" for the digital folks out there!!!
  14. RemyRAD

    RemyRAD Guest

    Sure, TVPostSound, the voice on the M. R. L. test tapes is that of Jay McKnight. The founder and owner. The same person who reamed me a new ass hole for calling him up and telling him that his latest series of fast sweep calibration tapes that he sent to me at Scully were all defective because he changed his positive going scope trigger pulse to a negative going trigger pulse. Later to call the next day, apologizing profusely to me and replacing all of our calibration tapes with properly mastered versions.

    Yes about that tiny Mr. Weber stuff.... What's your favorite flavor 185? 250? 320? Or should I say Scotch 111 is to 185. Like Scotch 206 is to 250. Like Scotch 250 is to 320. Or substitute your favorite Ampex or Agfa equivalents. Frankly, I couldn't stand the smell of Ampex tape. I liked the consistency of the slit of the Agfa 468. But that 250 at 6 DB over 250 nano-Webers, when biased for lowest modulation noise utilizing a 10 hertz sinewave while monitoring repro/playback, through headphones at 30 IPS was fabulous. No bias rocks and superclean bass tracks. OK, OK so it pretty much worked out to 3 DB over 10kHz at 15 IPS. But watch out for that print through that's where the Agfa 468 was really super over both Scotch and Ampex.

    It was pretty cool to see, at the AES in NYC this year, the couple of new 2 inch tape manufacturers. Both have their special new secret recipes with 11 secret nerds and Spice Girls. Rolling barefoot without nose reduction. Finger picking good! Mmm mmmmmmm.

    Oh yeah Cosme, you really can't make this work in an overdub situation. This would be fine if you're tracking initially. Say you were recording a violin demo with piano accompaniment in your studio to 2 track. This would work in real-time since the performers are not wearing headphones listening to play back while playing.

    In that respect, one could roll 2 inch 24 track in playback/repro while recording the basic rhythm tracking sessions. You route to your 24 track analog machine, through that to your 24 track digital machines input. That's where you really get the advantage of the saturation mostly on drums and instruments with significant transients.

    Otherwise, you could glean some advantages by simply taking your purely digital production and instead of using saturation emulators like the new Neve thingy, you have the real deal instead. Basically, you would in effect be "re-amping" your digital signal, decoding your stereo digital mix to its analog output, then on to analog tape input and re-encoded back to your digital 2 track input, for obvious purposes and assorted release formats.

    I actually met Colonel Sanders when I was a kid. Love that chicken, from Popeye's also since I also like spinach. Even though they don't serve any. Just remember kids, don't play with recording tape if you're eating fried chicken. The tape already has plenty of silicon lubrication and doesn't need chicken fat. But anything with chicken that is good so, disregard the part about playing with the tape with greasy fried chicken fingers.
    Ms. Remy Ann David
  15. TVPostSound

    TVPostSound Guest

    Agfa? Really?? That stuff fell apart on us after 2 years!!
    But the Scientologists loved it, and always brought their own!!
    I hated the smell of Agfa.

    I used 456 on an MM1200 for so long I could not get happy with anything else!! 250nW +4 EOL, 15 ips, 1K peak bias, Dolby A.
    The last analog was 499 on an MTR90II, then we stepped up to 320nW +6EOL 15 ips, 10k +3 overbias, again with Dolby A, then SR

    Wow, I remember all this stuff!!

    And the only Scotch I liked was 1/2" or
    the stuff that was aged in an oak barrel!!

    So Remy, I was taught to edit tape with a dull blade by a guy who owned/operated a truck in the D.C. area 80s/90s.
    But did post on his productions here in LA. He showed me how it could soften the edits. Did you ever run into him??

    If you dont remember, Ill tell you later!!
  16. RemyRAD

    RemyRAD Guest

    I think the remote truck from the mid-late 1970s you're talking about was either Sonority Recordings truck, where one of the partners, Roger Byrd, was also from NBC who trained me for Meet The Press but I don't think that's who your talking about. Or, if it was the late 1970s, early 1980s then Eddie Eastridge of BigMo Recordings. Eddie had a custom built audio console which utilized the Allison/Valley People trans-amps. The Sonority truck had a Neil Muncie S. S. I. (Suburban Sound Inc.) Melcor/API console with rotary faders and was in a step van. Where Eddie had a Ford front-end and a customized 24 foot box.

    The best remote truck in the DC area with a vintage Neve
    Ms. Remy Ann David
  17. demagging how often

    This is a good topic. More please, Remy.
    It's getting harder to find engineers to calibrate machines, especially here in the UK.
    How often should demagging be performed? I'm using a Tascam msr 24s, and recently I was doing some rough mixes. I got a great snare sound on one track. I had to set up for another track and lost the mix (no recall or flying faders). When I returned to the original track I just could not get that snare sound.
    After some thought about it I decided it was time for a demag. As soon as I did that the snare came back to life.
    It wasn't just top end that had died, there was depth missing from the whole track, and I was getting good peak readings on the VU meters but it didn't sound as big and loud.
    I know mine is a budget machine but I'm getting really nice results. I've just got to remember to regularly demag, because it happened quite quickly.
    So how often should it be done?
  18. TVPostSound

    TVPostSound Guest

    It was Ed Greene of Greene,Crowe and Co, Unitel bought their truck.( Kennedy Center Honors, Christmas in Washington etc)
    Ed Greene was my mentor in post.


    Demag every day,clean heads every 4 to 6 hours of use, there is a method to doing it, and keep the tapes in another room!!!
  19. bent

    bent No Bad Vibes! Well-Known Member


    You're right, I've been trying to wrap my head around this and cannot come to a logical conclusion (they have yet to invent a machine that knows what you are going to play before you play it). :roll:
    The latency would increase, I gave you some serious misinformation there.
    Sorry for confusing you!
  20. Cosme

    Cosme Guest


    That's ok, I guess I'll have to reamp or record into the tape. I don't like the reamping choice because the tracking process takes place in digital, I'm guessing it doesn't bring the same result as tracking in analog, but I'll experiment.

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