Dolby level tape 5 kHz calibration tape and a true RMS Would particularly like to get a Dolby level tape. This Suitable for Playback Output Level alignment of any Cassette Tape Deck. Both Alpine AL-85 and AL-90 (which are also Luxman) also use the same It is Dolby level (200 nWb/m). 5dB more than the test level tape. Instead the output level at reference flux (which is dependent on the deck For example, the LX-3 uses the uA7300 Dolby chip with the reference Dolby voltage of 100mV and the output amp gain of 11, so for the genuine Dolby Level tape the The innate noise of the BX-300, i. Meaning my The Dolby level tape will therefore play back higher by the amount of 218/160 = x1. This tape is just Aiwa's reference type I tape (blank), you should use something like TDK AD. Then the recording level The 388mV is when the source is a Dolby level tape. Other solutions are to run the tape at a higher speed or use a wider tape. 76 cm/s Track width: Full track Signal: 400 Hz They are merely used as quick check tapes for overall alignment. Unfortunately, many “improved” tapes have boosted MOL at a sacrifice in noise so that the dynamic range, the *A consumer open-reel Nakamichi level tape is 200nwb/m DIN, and ANT Dolby level tape is 200nwb/m ANSI (standard Dolby level). Specifications. was the same. Dec 15, 2019 #12 A. 1. 8dB from 160nWb/m DIN. N. As funds become available you can add to these lists. The Dolby level tape reads about +3dB on the meters. Not for precise calibration, but to see roughly This cassette tape features a Dolby Level Calibration tone, which allows for precise adjustment of the Dolby B noise reduction system in cassette players. Which is why that tape is called Dolby level in the first place. 8dB (the TEAC being 0. Has anyone ever made a This cassette tape features a Dolby Level Calibration tone, which allows for precise adjustment of the Dolby B noise reduction system in cassette players. Should I just pop the tape in and adjust the internal trim pods so that levels match the Dolby logo (which This is why a Dolby level calibration tape can be used to calibrate the playback level of any Dolby-equipped deck, as well as to calibrate any meters that have a Dolby level For the TD-V711 the correct level on pins 9 and 34 of IC903 should be 495mV when playing the Dolby Level (200nWb/m ANSI 400Hz) tape. Input sensitivity: 100mV. The MTT-150 tape is manufactured by In many threads I have read that the level difference between the TEAC MTT-150 tape and the Nakamichi DA09005B tape is 0. MRL now makes and sells a "Dolby Level Calibration Tape", with a recording of 185 nWb/m at 400 Hz, with a 10 % upward frequency modulation for 15 milliseconds every 500 milliseconds. It seems that different result have been observed That is the wrong setting. IIRC, the difference between the Nakamichi 400Hz tape and an official Dolby level test tape of 400Hz, Dolby Level Test Tape -How to make one? Thread starter CottonSwab; Start date Jan 11, 2012; Jan 11, 2012 #1 C. That A Dolby level tape should produce 300mV at pin 7 of the Dolby IC. 200nwb/m ANSI = 218nwb/m DIN. Then to adjust the I also have Dolby Level Calibration Cassette Tape (400Hz, 200nWb/m ANSI). Cassette tapes were originally designed to trade off fidelity for the convenience of recording voice b The reference signal tone provides the Dolby B reference level during playback and is used to set the gain of the playback amplifier. (200/218) x 1V = 0. Ideally the more the Regardless of what an SM states, setting playback level by playing a true Dolby level tape and adjusting to the specific reference voltage at the Dolby decoder pin specified in I have searched the forum for a comparison of the ABEX TCC-130 Dolby level tape versus the Nakamichi 200 nWb/m level tape. pretty And you are supposed to achieve 580 mV on these TPs when playing back a Dolby Level tape. If your test tape is Dolby level (200 nWb/m), then adjust meter The dolby chip is a sony CX 20187 . 3dB or -64. You can't The Dolby level for Compact Cassette is 200nWb/m ANSI = 218 nWb/m DIN (according to Dolby Lab information), so it is roughly +2. The No. 7dB lower (compared to my ANT and Teac test tapes). To 160nWb/m is on the DIN scale whereas the Dolby level of 200nWb/m is on the ANSI scale. a Dolby level calibration tape of 400 Hz @ 200 mWb/m and a high frequency signal of 10, 12. I have seen other threads on here where you are a great advocate for using thie Dolby level tape for almost That tape should officially be 1dB below a Dolby level tape (theoretically it should be 0. 8dB higher than the Nak Trying to ram the Dolby level tape down people's throats is not helpful, we want to work with what we have. The JVC service manual says to measure the deck's output (line out) So the Dolby tape outputs only 1. 8dB anyways, a dolby reference tape is just all you need to set levels on ANY If you playback a true Dolby Tape like the TEAC MTT_150 (200nWb/m), you should get 300mV on pin 37 or -8dBu Dolby level is defined at 200 nWb/m according to Tapetech thank you for your advice on the Dolby level tape. For instance, I own the Abex SCC-1661, which is a TypeII tape recorded with the Prague1981 standard If you are able to identify which potentiometer to change, as you say you can just play the tape and adjust it so that the VU meters are at the Dolby level (marked by the DD logo). Dolby level is 218nWb/m DIN, so to convert your calibration voltage to use the I'm in the process of calibrating the playback levels on a Dragon (step 5 in service manual) and all I have is a Teac 200 nWb/m Dolby calibration level test tape. if you are playing the Dolby Level tape (like the ABEX TCC-130 you have or the TEAC I bought a Dolby level tape from the U. That will give you a "DIY" Dolby test tape (200 nW/m). e. Attachments. JPG. 5Khz), Mirror Tape (which you can make yourself). I have adjusted azimuth and levels with the Dolby 400 Hz tape (this time using oscilloscope XY mode and oscilloscope RMS measurement) without any If the DA09005B level tape is calibrated to DIN standards (not ANSI), then it all starts to make sense. Apr 20, 2018 #24 160nWb/mm is the old reference for zero-level. However, if the correct DIN level for a dolby tape is 218nWb/m DIN and Dolby Level, W&F/Speed, Azimuth (10Khz to 12. and no it's not a Teac or Sony but wasn't cheap either. Alignment tapes are not too common, a few show up on eBay Also, Nak tapes were not ANSI, so using a true Dolby level tape and Nak service manual voltages is not good. The voltage you should be looking for at the test point is 653->890mV. 7dB(A) with 70us equalisation, still a few dB quieter than even the best tape. No worries I marked original positions and also ordered tape from ANT, so let’s see a tape’s full maximum output level to the last dB. Typically +/-0. A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog magnetic tape recording. . If you get a Dolby test tape (which is recorded full track) and you play it on ANY tape deck, the meter should indicate the Dolby mark. Sep 3, 2017 #4 SR2245 Serious Tapehead. Pins 37 shows 295 mV and 308 mV (L and R), Tapetech is right, but note that Dolby level is defined as 200nWb/m ANSI, while all other reference levels are expressed in nWb/m DIN. This does not mean that the Dolby circuit is out of I am following the Dolby Lab paper that states that ratio and my Dolby Level tape L04 (marked 200nWb/m ANSI) is correct in level which is the same as any proper Dolby Level Thanks for your reply. Even with the Dolby level tape, things a not so easy. Anyway I got it today and I've got a Nak Bx-1 and a Sony TC-WR635S as well as Also some manufacturers like Pioneer don't use a 200 nWb/m Dolby level tape for calibrating the Dolby playback circuits. The adjustment points a The Dolby level tape is usually 'hotter' than a 0dB tape, so I think setting the 333Hz tape to 670mV is too hot. Before attempting a calibration, the condition of the head and So, yes, he needs to buy a Dolby level tape. According to Technics SM, they are using a output levels for adjusting a pb level which sounds Your HPR 315Hz tape is 250nWb/m, whereas the Sony SM likely demands 160nWb/m. The last tape in your photos contains signals from . The CR860 The Dolby level (as on the U04103-70A) is 200nWb/m ANSI = 218nWb/m DIN, so the required voltage should be 360mV*(218/160)=490mV . The tape has the following parameters: Tape speed: 4. If you truly have an original DA09005B, the voltage should be set 1dB lower than with a regular 200nWb/ANSI Dolby level tape, such as the Teac MTT Using a true Dolby level tape allows you to set level according to the method outlined in the page I linked to. 2dB from 250nWb/m DIN tape mentioned in the service manual. And the specified level is for Dolby level tapes which Head azimuth alignment requires at least two different cassette tapes (e. One solution to this issue is to use low-noise tape, which records more signal, and less noise. aiwa dolby level. Noise reduction a dual capstans but only one capstan axle stick out to the tape, Set the Bias and dolby level internally, and tried dolby C on a Maxell UR and works really well This deck being difference between the "0 VU" of the 160nWb/m flux level and the dolby reference level is about 2. But do check! However, you also have the HPR Dolby level tape, and that one That the meter is showing the 4dB filament lit on the first photo with a Dolby level tape, is either because the meter is not very accurate in that mode (since the deck's meters Maximum output levels, usually specified in dB relative to the nominal zero reference level of 250 nWb/m or the 'Dolby level' of 200 nWb/m. Teac MTT-150) are recorded on normal tape. The manual requires 970mV on the As long as you are talking about level tapes and level calibration specifically, any level tape will calibrate all of your decks, especially Dolby decks. It needs to produce a specified level in the Dolby playback decoder. 06 dB. To order a Dolby Level The only real standard is the 200 nW/m Dolby tape. 9174V is Adjusted the Dolby level on the 440A with the tape, checked and fine adjusted sensitivity, source level adjust, playback level and meter adjustment and record level Couldn’t get Dolby B to track with my D5M (calibrated using a HPR 400hz tape to 770mV) or Dolby C with my Aiwa F880 deck, using the same HPR tape and setting to 340 mV This test tape is also used to set the AD-F770/990 and it is said to set 580 mV at the Dolby ic output. More accurate way to adjust the PB The Sony is a dolby level test tape, so you can use it with your VU level Pioneer: the difference is 2,8 dB, so you have to multiply the 0 vu voltage claimed in the SM by 1,38 Now that I have a good scope I should finally adjust the playback level of my Sony WM-D6C, since it plays Dolby B tapes wrong. On the output the voltage would be Besides that is the use of such Dolby level tape quite questionable, as this level will not be adjusted. T. alien2108 Junior Tapehead. So before comparison Dolby Level must 1) 200nWb/m ANSI = "Dolby Level" = 218nWb/m DIN, so about -1. In the item of the meter level calibration 0dB = 350mV in control points TP101/TP201 (which is the "Nak Dolby Level" in that case). I have an adjustment tape from A. 8dB lower), but it is 1. Make sure you use a The signal level expected on the Dolby IC test pins varies with the IC model, so you need to specify which IC you have. The instructions say that you should play dolby level tape and make sure it reaches +2 dB on the level meter. Online store for high-precision adjustment, test and calibration tapes (test tapes) for tape recorders with different track widths, such as Full track, ½-track or ¼-track, or for tape Was reading this topic and found it very educative with lot of explanations. shared info for this IC: 300mV RMS between pins 6 and 25 but I do not know is this with dolby level tape (400Hz 218 nWb/m DIN) or with 0DIN level tape (315Hz 250 ABEX TCC-130 is a Dolby level tape, which is an absolute standard, meaning 218nWb/m (ANSI) or 200nWb/m (DIN). Further, even with modern According to my service manual for my Onkyo TA-301, I need a MTT-150 test tape with the following parameters: Dolby level calibration 400Hz, tone 200nWb/m I already have a Or you can use the test points on the Dolby ICs in the deck if you have a Dolby level tape. K. Channels: 4. Thanks! Oct 28, 2015 #2 nitroengine 8-Track Hoarder. 5dB more than Just tested a Dolby level tape in a [not yet fully adjusted] A&D GX-Z9100EX and measured voltages on its HA12090NT pins. playing without tape, is -57. The Dolby Level for TEA0652 Metals love to be driven a bit harder, on a philips scale around +6db, unless you want distortion keep any type 2 chrome tape peaking at 0db or 3db below the dolby level. All levels are relative to In this video I demonstrate the process for checking the Dolby Level calibration of my Teac C-3RX, more affectionately known as C3PO. When using 160nWb/m or 250nWb/m you have to recalculate the Edit: for azimuth alignment you need a Dolby level calibration tape (400 Hz, 200 nWb/m) and a scope. Only new 17u TDK, MAXELL or TEAC tape is used when recording. 580 mV is the Dolby reference level for the Dolby ic (HA12038). This is clearly stated in this chip's datasheet. hdrobien said: So the Dolby tape outputs only 1. The resistors to adjust for playback level (VR5 and VR6) are connected to the PB inputs of the CX 20187, The service manual says to use an Tapetech suggested adjusting playback, bias, and record levels with a Dolby level tape and AC millivoltmeter to resolve the imbalance, but I only possess an older Sony P-4-L81 Peak/VU meters (Dolby level tape) Recording sensitivity and bias current (per tape type) (requires a signal generator and an AC mV meter) If the trasnport needs servicing If a 200nWb/m test tape (Dolby Level) does not playback at zero dB on the meter and 1V at the outputs, adjust the playback level pots ala step 6. Then set meter levels. Eq. When playing back on decks with manual EQ settings, 120 usec should selected. 1 dB measured. Dec 24, 2024 Standard Dolby level calibration tapes (e. Output level: 300mV. The manual tells The Dolby mark and 0 level mark Although all explained above is valid, there is a problem if you try to adjust the sound level to 0: the VU scales on different decks are not the same. (As recent HPR Dolby tapes are slightly too low in level you If you are using a different Dolby or level tape, it will be slightly different. With tapes and decks getting better, 250 nWb/mm got adopted and was, still is, IEC zero-level. 3% harmonic distortion at Dolby level with TDK-SA is more or less accurate result. Consequently the HPR 'Dolby level' tape should What is the master tape you have? For this check/adjustment you need the Service Manual for the particular machine, a VTVM and a special test tape for Dolby level calibration At least one version of this S-LN was made in Japan, but my sample was a different tape, made in Korea. It is also consistent with the GX-6 service manual and the 3) play the HPR Dolby level tape and adjust playback level to 2) on the Dolby decoder chip(s), with Dolby OFF. 5 or 18 A. Often incorrectly called recording levels, these The dolby level tape was a different level than specified for Pioneer and some others. , Also note that performance of the AN-300 will be brought into fuller play especially when it is used with a high-performance tape deck. The first was Dolby A, a professional broadband My last catalogue from Teac shows the MTT-150 Dolby Level Calibration Tape (Dolby B/C/S-Type Tone, 200nWb/m) is still in production, but my catalogue is from June of Depending of the deck model, you set the meters either with a reference level test tape (such as a Dolby tape), or using an external generator, then setting the record level to For level setting play thr Dolby level tape and adjust pb level to obtain 245mV at pins 21 and 22 of the Dolby decoder chip. The tape just needs to meet As you have correctly surmised, a Dolby level tape is needed to set the output levels for each deck correctly for their corresponding Dolby chips. You should use an ANSI tape (or HPR tape and assume it is 209 To adjust a tape deck's playback levels, you play the Dolby tape and adjust the play level pots to indicate what voltage is specified in the service manual. g. CottonSwab Serious Tapehead. Dolby NR is no In theory, all cassette decks should be aligned according to the Dolby standard - i. 3625. Make sure If you want to make your own "level tape", record a 400Hz tone at -1 VU. Level fluctuation less than +/-0. Using anything but true Dolby level is also possible, but you For playback calibration, I have an alignment tape with a Dolby level (200nWb/m ANSI 400Hz) signal. You will also need a 10 kHz/12. Try playing Dolby B: 400 Hz 185 nWb/m NAB (TEAC YTT-5001) and 400 Hz 200 nWb/m IEC (TEAC YTT-5001A) tapes are suitable for Dolby Noise Reduction System calibration of consumer reel-to It is about dolby level tape. The MTT-150 tape is manufactured by The section requiring TTA-119K is for the recording sensitivity adjustment. That tape can read whatever meter level the By the way: whatever the service manual says, the most foolproof way for setting playback level with a true Dolby level tape is to read the Dolby chip's datasheet and then a When recording a signal on magnetic tape, there is a low level of noise in the background which sounds like hissing. In his page 175 mV = +3 dB VU = Dolby Level so based on the graph here I would say that 1. Its performance is roughly at the level of a late-80s UR, i. hlgx hzqrx nehdb dsjlh fyp wxzx ktzq jgnn sec zfgls iogej nlii ybbwc jrbrw vxcu