I understand Sid Smith later said that it was a mistake to use two stages." Our contributor Peter K. The 10B has two RF stages but tubes have a lot more headroom. This is especially true when the antenna input is single-tuned. You need sensitivity indoors but the IP3 kills performance when you put big signals at the input. Its selectivity is more than adequate for most uses, but its third order IM performance is abysmal, creating interference problems at signal levels far lower than those used in the IHF selectivity test." Our contributor David Rich adds, "Two stages of RF give very good sensitivity but poor IP3. The Marantz 10B is the poster boy for third order IM problems. Our contributor John Byrns summarizes: "The IHF spurious response measurement is largely irrelevant in any halfway decent tuner uses a single interfering signal, while the predominant spurious response problem in better tuners is third order IM which requires the use of two interfering signals to measure. The adjacent channel IHF selectivity should be almost nil (passband too wide)." What is found in the field could be even less. Therefore, I believe the maximum IHF selectivity for the 10B would be around 100 dB alternate channel. This is the alternate channel selectivity the 10B's IF could produce except for one problem the 10B's spurious rejection is only 100 dB. Here, the 10B's response curve is down by about 109 dB. However, a modulated carrier has a sideband at about 320 kHz. As per Marantz, the 10B's IF response is down about 152 dB at 400 kHz. They are probably accurate but are meaningless in real world use. The 150 dB and 42 dB figures are (as they describe them) IF filter response curves. But it is a mediocre performer by the standards of even five years after its introduction, much less what is available today." Ben Blish of commented, "My 2130 eats my 10B for lunch"! Our contributor Al points out that "Marantz never, ever published the IHF selectivity of the 10B. YES, it is a gorgeous tuner with very high production and build values. calls the 150 dB spec "horse manure").įormer Stereophile reviewer Don Scott said, "Try a 10B on a station that has three subcarriers and join the Audobon Society," meaning its poor SCA rejection makes it prone to "birdies" (whistles or heterodynes), and as part of a 1987 review for Stereophile Don estimated one particular 10B's selectivity at a very pedestrian 70 dB alternate, 10 dB adjacent. However, if you're looking for a top tuner and not just a collector's item, don't buy a 10B without reading the discussion in our FMtuners group beginning here, and here (where our knowledgable contributor Brian L. I tried different tubes and cleaning it." The 10B's claimed selectivity specs (150 dB for alternate channel and 42 dB for adjacent channel, which would be on a par with the MR 78 or T-9090II if only they were true), are awesome. I listened and tinkered with that one for a month but didn't know what was wrong and couldn't help the guy. Two I've seen in Dallas were kept in a garage because they 'aren't working right.' One other was in an apartment closet because it only played in mono. Jim added, "I have heard many accounts of 10B's laid to the side, sold as problematic or even enshrined as objects of audio art (in Japan). Our panelist Jim said, "I've borrowed two different Marantz 10Bs and both only played in mono because the opto couplers went bad" ( sells new replacement opto couplers, but we don't know him personally). Marantz 10B (1964, $650, photo, schematic1, schematic2, brochure1, brochure2, brochure3, brochure4, brochureA, brochureB)īy most accounts, the FM-only Marantz 10B has great sound on strong signals and a tendency to require repair rather frequently in order to continue to perform at its peak. Further information on Marantz tuners is available at Ben Blish's. We recognize that we lack detailed writeups for many early-'70s Marantz tuners it just happens that our panelists haven't had the chance to play with as many Marantzes as some other names. In parentheses after the model number are the year of introduction and most recent list price, and/or the original list price if indicated by "orig" (special thanks to David Rich of The Audio Critic for copies of historical material from his reference library). Tuners are listed in alphabetical and numerical sequence by model number. Granted to quote our text so long as proper credit is given.ĮBay listings that quote us incorrectly or without credit may be
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