Beschreibung
Tandberg 3001 A Tuner - WORKING BUT NEEDS ATTENTION This item was my partners dads and I am listing it for him. It has not been used for some time but, looks in great condition. He does not have the original power lead but these can be bought off Ebay, although the type of person that may want this could have one as itis the same as Studer Revox. My partner connected it by making a lead with clips. Everything comes on and lights up as it should and we connected it and got a channel. However, the tuner needle does not move when turning the tuner dial. He thinks this must be something that may of just come off inside as we did tune it into a station an it was ridiculously clear. So, the tuner needs attention. If you are looking at this and know what it is, is is regarded as one of the best tuners ever made. Comes with Tandbergs famous teak side arms, that can be removed if you want a slicker looks. Grab yourself an amazing esoteric piece of audio equipment. Please note - THERE ARE NO RETURNS ON THIS ITEM Collection from Salford / Manchester PREFERRED. For more details call Les on 07979827173 If shipping is required, please contact to get insured shipping quote. I will ship internationally through the global shipping program Thanks for looking Heres are review from Classic Hi-Fi http://www.hifi-classic.net/review/tandberg-3001-294.html About this item Tandberg’s “Series 3000” consists of a group of true “state-of-the-art” audio components whose rated performance in many instances surpasses anything previously attainable. The series includes an FM tuner, a preamplifier, a power amplifier, and a cassette deck. The Tandberg 3001 programmable FM tuner, the subject of this report, is notable not only for its distinctive styling but for its performance, which in many respects exceeds the measurement capabilities of available laboratory instruments. The 3001 tuner does not employ digital synthesis, or even a digital frequency display, because the required pulse circuitry inevitably increases the tuner’s noise level to some degree. One of Tandberg’s goals was the best possible signal-to-noise ratio both in mono and stereo reception, and the success of their engineering efforts can be appreciated from the tuner’s S/N rating of 95 dB in mono and 82 dB in stereo at the usual 65-dBf signal level (the stereo S/N rating improves to 92 dB at 85 dBf input) These S/N ratings are 10 to 20 dB better than those of most top-quality tuners and are well beyond the capabilities of the Sound Technology 1000A signal generator (used by us and most manufacturers and test laboratories) or any other presently available signal generator that we know of. Since commercial laboratory signal generators are not able to measure these low FM noise levels, Tandberg had to devise special measurement techniques for that purpose. Physically, the Tandberg 3001 is a “low-profile” unit only 3-1/4 inches high, 17-3/8 inches wide, and 13-3/4 inches deep. It weighs just over 15 pounds. The silver-colored front panel appears quite conventional, with a fairly short dial scale calibrated linearly across the FM band (the tuner does not have AM coverage) and a flywheel tuning mechanism operated by a large knob. To the left of the dial are two meters; one is a channel-center tuning indicator and the other reads signal strength directly in microvolts at the tuner’s 75-ohm antenna input (it does not have the usual 300-ohm antenna circuit). The microvolt calibrations are logarithmic, covering a range of 1 to 1,000 microvolts (?V). The meter has an auto-ranging feature so that when the input exceeds 1,000 ?V its scale expands by 1,000 times to cover a range of 1,000 ?V to 1 volt; a red LED comes on below the meter to indicate that fact. Next to the meter is a small window marked program, which will be described shortly. The lower portion of the panel contains small knobs for i.f. bandwidth selection (wide, normal, narrow) and a continuous muting level adjustment calibrated logarithmically from 1 to 3,000 ?V. Four small pushbuttons with red LED lights above them control muting, servo (an AFC system that is automatically disabled whenever the tuning knob is touched and comes on when it is released), ANC (an automatic noise-canceling circuit that operates below certain signal levels), and mono operation. There is also an mpx stereo-indicator light. To the left of the program window are eight small pushbuttons for the preset tuning channels, and below them is a store program button. Up to eight frequencies can be stored in the tuner’s memory by simultaneously holding in a numbered button and the store program button. Large red numbers appear in the program window to show which button is in use, and an “F” appears there when the tuner is in its manual tuning mode. In preset operation the channel-center meter becomes a rough indicator of the tuned frequency, reading on a second scale from 88 to 108 MHz; a “AF” light below the meter goes out to indicate that it no longer shows channel-center tuning. Touching the tuning knob at any time restores manual operation and disables the AFC. The remaining front-panel controls are for output level and power. On the rear apron of the 3001 tuner there are both fixed- and variable-level audio output jacks, oscilloscope outputs for external multipath indication, a detector output ahead of the de-emphasis, and a three-position de-emphasis switch offering 25-, 50-, and 75-microsecond characteristics. The tuner has a detachable a.c. line cord and a switch to select either 115- or 230-volt operation. The only antenna input is a coaxial connector for a standard 75-ohm cable fitting, since Tandberg feels that the full performance of the tuner is likely to be realized only with a high-quality antenna having a shielded coaxial (75-ohm) feed line. However, to suit the majority of U.S. installations, which use 300-ohm antenna systems, a plug-in matching “balun” transformer is supplied in this country. The performance ratings of the Tandberg 3001 (in accordance with the 1975 IHF T-200 standard) are exceptionally complete. Specific characteristics will be discussed in later sections of this report. Price:$1,500. Laboratory Measurements From the tuner’s specifications, it was obvious that we would not be able to verify many of the ratings (especially the S/N and distortion) with our regular test equipment. Although most of our measurements of the Tandberg 3001 were made with the same instruments and procedures we use for all FM-tuner testing, we recognized that the inherent stereo channel separation, noise, and distortion of our signal generator are considerably inferior to the corresponding ratings of the tuner and that we would therefore in all probability be measuring the limitations of our test instruments. The only respect in which we were able to go beyond those limits was in the S/N measurement, using a 98-MHz crystal oscillator made by Tandberg specifically for that purpose. Since the oscillator is unmodulated and a 19-kHz pilot carrier is necessary to put the tuner into its stereo mode, we injected a 19-kHz signal into the tuner’s multiplex circuits for stereo S/N measurements. We were able to measure S/N levels of 92 to 93 dB in mono and 87 to 88 dB in stereo even in our unshielded test environment. It should be noted that the signal level required for this ultimate quieting is at least 85 dBf, so it cannot be directly compared, strictly speaking, to the usual tuner-noise measurements made at 65 dBf although the difference between the two levels is usually very small with most of the tuners we have tested. All our signal levels are stated in dBf, since the usual “300-ohm” microvolt levels would have to be halved for the 75-ohm input of this tuner. There were small differences in sensitivity between the three tuner i.f. bandwidths, but the values in the normal position are typical. The IHF usable sensitivity in mono was 12 dBf, and the stereo sensitivity was set by the switching threshold at 19 dBf. The more important 50-dB-quieting sensitivity was 11 dBf in mono and 35 dBf in stereo. The fact that the 50-dB-quieting sensitivity is actually better than the “usable sensitivity” reflects the tuner’s extremely steep quieting curve even at very low signal levels. The distortion readings were 0.05 and 0.35 per cent in mono and stereo, respectively, at a 65-dBf input (normal). The former figure is known to be the residual distortion of our signal generator, indicating that the tuners mono distortion is much lower than 0.05 per cent. The S/N measured 78.5 and 71 dB for mono and stereo with our regular signal generator. This would be considered very good by our usual standards, although the measurements obviously reflect the residual noise of the signal generator to a great degree. In the wide- and narrow-bandwidth modes the noise readings were approximately the same, but the distortion levels changed. In narrow the mono distortion was still a very good 0.135 per cent, but the stereo distortion rose to 0.6 per cent. In wide, the mono and stereo distortion readings were 0.05 and 0.1 per cent. The frequency response of the tuner was ruler-flat, within ±0.2 dB from 30 to 15,000 Hz. The channel separation changed with bandwidth, although the wide and normal readings were about the same from 30 to 800 Hz (increasing from 52 to 60 dB over that range). The separation fell at high frequencies to 40, 33, and 30 dB for wide, normal, and narrow bandwidths. As would be expected, many other performance parameters depended on the bandwidth, although the values were often far better than those we usually encounter when testing FM tuners. The capture ratio was about 2 dB in normal and 3 dB in narrow, but in wide it was virtually unmeasurable—our reading was about 0.8 dB. The AM rejection was 67 to 74 dB, depending on signal level (it did not vary significantly with bandwidth), compared to its rating of more than 70 dB. The tuner’s rated image-response ratio is greater than 135 dB, a figure that cannot be measured by any normal signal generator. In our tests it exceeded the 120-dB limit set by the maximum output of our signal generator. The tuner hum level was 74 dB below 100 per cent modulation. Naturally, selectivity was a function of i.f. bandwidth. Alternate-channel measurements were 29 dB (wide), 81 dB (normal), and 86 dB (narrow). The corresponding adjacent-channel readings were 5, 13, and 18 dB. The rated alternate-channel selectivity (wide, normal, narrow) is 30, 90, and more than 90 dB, while the corresponding adjacent-channel ratings are 3, 12, and 40 dB. The muting threshold was adjustable between 20 and 72 dBf, and the stereo threshold was about 18 dBf. The tuner’s cancellation of the pilot carrier was extraordinary, with the 19-kHz leakage being at a barely detectable —90 dB. Tandberg is one of the few tuner manufacturers to publish IHF intermodulation-distortion ratings based on 14- and 15-kHz modulating signals, each at 50 per cent modulation. Their rating for the 1,000-Hz difference-tone component in mono is less than 0.1, 0.15, and 0.5 per cent for wide, normal, and narrow bandwidths. Our measurements were 0.04, 0.06, and 0.16 per cent. Their stereo ratings are similar, except for an increase to 0.8 per cent in narrow, but we did not make this test in stereo. Equally impressive were the odd-order intermodulation-distortion products at 13 and 16 kHz. Compared to the primary tone levels, they were at —80 dB (0.01 per cent), — 57 dB (0.14 per cent), and —37 dB (1.4 per cent) for the three bandwidths. Although few manufacturers include these data in their ratings, we have been making this measurement for some time. In its wide mode, the Tandberg 3001 surpasses every other tuner we have tested over the past year and more in respect to IM distortion. We made some measurements on the noise-canceling system (ANC) to see the relationship between signal level, channel separation, and S/N. Above 55 dBf, the ANC has no effect. As the signal is reduced below that level, the channel separation decreases and the S/N improves (compared to the readings with ANC off). At 35 dBf, the separation was only about 4 dB, but the S/N improvement was about 8 dB. At 25 dBf, the signal was essentially mono, with a noise improvement of about 15 dB. Comment It is not possible to design a tuner that excels simultaneously in every respect, since many of the parameters are mutually exclusive (high selectivity and low distortion, for example). Tandberg’s three-position switchable i.f. bandwidth lets the user optimize the tuner’s performance for a particular listening condition. Even in broadcast range of New York City, whose crowded FM spectrum has more than fifty receivable stations, the 3001, when set for wide, provided the lowest distortion and widest channel separation as well as the highest S/N we have yet measured on an FM tuner. Only in the most extreme conditions, when one must receive an adjacent-channel signal in the presence of a strong local signal, will it be necessary to use narrow bandwidth. In most cases, leaving the bandwidth at normal will give fine results, better in almost every respect than other fine tuners can provide. As we have stated, no other FM tuner comes even close to matching the S/N of the Tandberg 3001. This is due in large measure to a remarkably complex and sophisticated multiplex decoder, which occupies more space in the tuner than any other section and which we would estimate contains far more components and active devices than practically any other complete tuner we have seen. We wondered why, in view of the inherent noise and distortion accompanying every FM broadcast, Tandberg chose to devote so much effort to the multiplex section of this tuner. Their answer was that the same characteristics that give it very low noise and wide separation also reduce its various intermodulation distortions to a minimum—and they are certainly far lower than those of most other tuners. Although we verified to our satisfaction the technical claims made for this tuner, we were unable to hear any significant difference between it and other good tuners in actual reception. This is not to say that such differences do not exist, but we suspect that a proper comparison can be made only with a very strong (at least 85 dBf) and very high-quality signal so as to realize the full quieting of the 3001. That sort of signal is not available in our area (if anywhere). The ANC feature is roughly equivalent to the automatic changeover from stereo to mono (sometimes in two steps) that is provided in some tuners when the signal strength drops to a point where noise can be objectionable. However, in Tandberg’s system the transition is smooth and continuous rather than abrupt, in many cases providing a listenable signal with some stereo separation where otherwise one would have to go to full mono for an acceptable noise level. The program memories worked perfectly and always returned the tuner to the exact preset channel (aided by the inherent moderate amount of AFC). The action is totally silent, as is the normal manual tuning of the 3001, due to an ideal muting system that is free of any modulation bursts or thumps. Our only criticism of the memory system is that each time the tuner is turned on, it comes on in “manual” at the frequency to which the dial is set. Although the dial scale is quite accurate in spite of its short length, the frequency indications on the tuning meter in the programmed mode are merely approximate. At its price, the Tandberg 3001 is obviously not Everymans tuner. It is, however, one of the most advanced stereo components we have seen. Its selectivity, noise, distortion, channel separation, and interference-rejection abilities are all at or beyond the limits of measurability, and that is a most impressive achievement. Collection from Salford / Manchester PREFERRED & welcome due to weight. For more details call Les on 07979827173 If shipping is required, please contact to get insured shipping quote. I will ship internationally through the global shipping program Buy with confidence, with 100% sellers feedback, and bargain prices Thank you for looking
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