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aligning revox pr99 without manual
mr c deckard wrote:
the facts: 1) i need to align my pr99mkIII very soon for a mix session. recently had the heads relapped, got an alignment tape . . . 2) i'm having quite a hard time finding a manual for a revox pr99mkIII Get a B77 manual. The alignment directions will be the same. Or ask on rec.radio.broadcasting. There are a lot of those things out there and someone will be willing to make you a copy. what information will i need from the manual? can anyone supply this info? Not all that much but you should still read it over. DO NOT TOUCH the bias trap adjustments. Just do the azimuth, level, play eq, then go do the record bias and eq. Using the modern overbias method is probably better if you are using modern tapes. The manual may tell you how to use the old 1KC method with no overbias. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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aligning revox pr99 without manual
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aligning revox pr99 without manual
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#4
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aligning revox pr99 without manual
thanks for the replies, everyone. i did find a .pdf version somewhere
for $30usd, so i might do that for now. . . the controls are indeed accessable from the bottom, and well-marked, i think someone addressed the DIN monitor connector in another thread, although i'm not sure they gave a pin-out. i do have an oscillator, voltmeter and oscilliscope, so, i think i'm in ok shape (although i understand a distortion analyzer can be useful). chris deckard Generally alignment procedures are pretty much the same for any machine. What you'll need the manual for is to locate the adjustment points for playback level and equalization (if any), bias, record equalization, record level, and meter calibration. If you open the case and find a diagram or the controls are marked, forget the manual. Just find a generic alignment procedure somewhere, hook up your oscillator and voltmeter, and go. You've got those, of course? |
#5
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aligning revox pr99 without manual
i do have an oscillator, voltmeter and oscilliscope, so, i think i'm
in ok shape (although i understand a distortion analyzer can be useful). You definitely want to check harmonic distortion at 0VU at 1kHz when you're finished. It should be about 0.2%. If it's much higher on a ReVox, you're probably underbiased. My experience is that most decks, regardless of brand or format, tend to be overbiased for the recommended tape. This produces poor HF response, both in terms of flatness and extension. |
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aligning revox pr99 without manual
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#7
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aligning revox pr99 without manual
i dunno, mike. they looked like a legit distributor with many, many
..pdf manuals, but i didn't look too long since i really want a hardcopy (just for less than $250!). i found them via a google search .. . . i'll probably sit down in a few days with a bunch of printouts off the web and see what i come up with, waiting for the folks at savoy-hill to hopefully locate one. thanks again for the help, everyone. chris deckard st louis moe Sad when people rip others off like that, but if it gets you where you need to be, I guess that's OK. If you had said "someone offered to scan it for me, put it into a PDF, put it on a CD, and mail it and wanted $30 for his time" I guess I wouldn't have said anything. Maybe that's the case, but "find" suggests that someone had it, it didn't cost him anything, it won't cost him anything to send it to you, and he just wanted to make some money off your need. Capitalism, supply and demand, whatever. |
#8
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aligning revox pr99 without manual
mr c deckard wrote:
i do have an oscillator, voltmeter and oscilliscope, so, i think i'm in ok shape (although i understand a distortion analyzer can be useful). An MRL tape will come in handy as well... in fact, I'd say it was absolutely mandatory. As far as distortion analyzers go... they can net you some information when you're done... but frankly a 'real time analyzer' hooked up to the 'repro' output of the machine will often be of greater assistance during the alignment process. By looking at a 'real time analyzer' you can kinda get a good frame of reference on where the top flattens out vis a vis bias. Another stoopid pet trick for determining your overbias is to run a signal into the deck at around 10Hz and listen to the output... at one spot you'll achieve a sort of balance between 'noise and popcorn' which is usually the optimal overbias for the deck with a specific tape formulation. Once you find that spot, run a 10kHz tone into the deck and figure out where your overbias is sitting... finish your alignment with that overbias, listen to the product. If it sounds like you have a clear top with minimal noise, you hit the spot... if you have too much noise, you have too little overbias... if you have a 'clamped down' sounding top then you have too much overbias. Best of luck with it. -- Fletcher Mercenary Audio TEL: 508-543-0069 FAX: 508-543-9670 http://www.mercenary.com "this is not a problem" |
#9
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aligning revox pr99 without manual
As far as distortion analyzers go... they can net you some information when
you're done... but frankly a 'real time analyzer' hooked up to the 'repro' output of the machine will often be of greater assistance during the alignment process. By looking at a 'real time analyzer' you can kinda get a good frame of reference on where the top flattens out vis a vis bias. Aligning with noise rather than single tones has the advantage of using a test signal that is more like music. This is especially important at slower speeds. Has anyone made a study of how much "self bias" affects response at 7.5ips? |
#10
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aligning revox pr99 without manual
William Sommerwerck wrote:
Aligning with noise rather than single tones has the advantage of using a test signal that is more like music. This is especially important at slower speeds. Has anyone made a study of how much "self bias" affects response at 7.5ips? Some folks from Dolby did a study on self-bias and what it does to impulse response at various speeds with various kinds of tape. It was in the JAES some time in the eighties, I think. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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aligning revox pr99 without manual
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aligning revox pr99 without manual
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#13
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aligning revox pr99 without manual
Has anyone made a study of how much "self bias" affects response at 7.5ips?
Dolby has. This is why they invented (or maybe just named) Dolby HX. It compensates for self-bias by reducing the bias when recording something with a lot of high frequency content. Correct. (Banging O discovered the effect, by the way.) But I was thinking of speeds that would be considered "slow" by professional standards. (When I recorded live, I rarely ran at 15ips. It used too much expensive tape.) |
#14
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aligning revox pr99 without manual
hi - you can download the things here http://www.schori.info/ regards
"simonstav" wrote in message ... "mr c deckard" wrote in message 2) i'm having quite a hard time finding a manual for a revox pr99mkIII http://www.savoy-hill.co.uk/ 3) i've read the RAP FAQ, and some other documents, even did a google search on RAP, but they all indicate a need to refer to the manual at some point. http://groups.google.com.au/groups?q....com.au&rnum=2 http://groups.google.com.au/groups?q....com.au&rnum=3 http://groups.google.com.au/groups?q....com.au&rnum=4 Regards Simon --- Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.520 / Virus Database: 318 - Release Date: 18/09/03 |
#15
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aligning revox pr99 without manual
hi - you can download the things here http://www.schori.info/ regards
"simonstav" wrote in message ... "mr c deckard" wrote in message 2) i'm having quite a hard time finding a manual for a revox pr99mkIII http://www.savoy-hill.co.uk/ 3) i've read the RAP FAQ, and some other documents, even did a google search on RAP, but they all indicate a need to refer to the manual at some point. http://groups.google.com.au/groups?q....com.au&rnum=2 http://groups.google.com.au/groups?q....com.au&rnum=3 http://groups.google.com.au/groups?q....com.au&rnum=4 Regards Simon --- Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.520 / Virus Database: 318 - Release Date: 18/09/03 |
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