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SOLD - FOR SALE: Fully original FIDELITY-RESEARCH FR-7f MC cartridge in the box (rare)
*** SHIPPING IS FREE (WORLDWIDE with INTERNATIONAL TRACKING NUMBER) !
You can check my ebay ads as well, but the best price is always here on uk audio mart.
I decided to sell my beautiful Fidelity-Research FR-7f LOMC cartridge, but only because i just upgraded to "fz" by a chance!
Need to raise some funds to continue with this expensive hobby.
No question that FR-7f is a must have MC cartridge for every serious audiophile! On the right tonearm this cartridge can compete with everything at any price. It has sealed suspension/damper so they will last forever and it's safe to buy this old cartridge. Before spending multi thousand dollars on modern MC cartridges please do yourself a favour - check the Fidelity-Research FR-7f. Like Koetsu or Miyabi cartridges, the FR-7f series is the pinnacle of Japanese Moving Coil design. Fidelity-Research FR-7f is a true moving coil cartridge designed by Isamu Ikeda (now Ikeda Labs) in the 70's... and he's still pround of it.
Some key features of the FR-7f (google translate from japanese manual, sorry for broken english):
■ Push-pull power generation method with magnetic circuit of 2 magnet 4 pole composition. It is possible to take out a sufficiently large output voltage even with a low impedance coil by performing power generation at 4 places. In addition, although the cancellation current is generated in the power generation circuit by the general method, the magnetic circuit of FR - 7f can be taken out as the output in the positive direction in the reverse direction also in the conventional cancellation current generation region. As a result, the phase characteristics and crosstalk characteristics are improved, the electrical conversion efficiency is greatly improved, and the output power is also improving.
■ A samarium cobalt system magnet is adopted as a magnetic circuit material. This magnet has superior characteristics such as high coercivity and difficult to self-demagnetize compared with general Alnico series, and the initial characteristics of the magnetic circuit are retained for a long time.
■ A completely air core coil without a winding frame is adopted as a generating coil, and the unnecessary magnetic body does not move within the power generation magnetic field, and the distortion of the reproduction signal is radically eliminated. Moreover, the effective mass of the oscillator can be reduced to about 2/3, and the mechanical impedance of the high region is reduced.
■ Special aluminum alloy cantilever.This is a straight cantilever which has been optimally thermally hardened (ceramic treated) for high corrosion resistance special aluminum alloy to minimize the moment of inertia and deflection during high speed exercise.
■ Double damper system, two-layer damper structure with different rubber coefficients, it effectively dumps the mid-high range and middle-low range of the vibration frequency, ideal trace can be made over the entire reproduction frequency I am doing it. Moreover, since the rubber coefficients of damper A and damper B are different, the influence of temperature on trace performance, mechanical impedance characteristics and reproduction sound is reduced totally. In order to solve the problem that the coil lead wire vibrates together with the cantilever, unnecessary power generation by the lead wire portion is eliminated by inserting and crimping the coil lead wire between the dampers AB.
■ The head shell part has been taken into consideration to remove the dead space completely causing the parasitic vibration harmful to the sound quality. In addition, a special aluminum alloy is used for the material of the shell part, and further improvement of rigidity is made by impact processing (cold forging) and the occurrence of split resonance is proposed. For cartridge body material, epoxy resin selected with elaborate auditory test is adopted. A special stainless steel lock plate is adopted in place of the conventional guide pin in order to improve strength shortage due to backlash of arm and connector part. This makes it possible to integrate the coupling with the arm more evenly, and it is possible to keep the levelness correct.
OK, so the FR-7f is dramatically improved FR-7, in other words the FR-7f is much better than the earlier FR-7 model.
You can read more about FR-7 series on audiogon forum in "Fidelity Research Cartridges" thread.
It is very interesting to read Jonathan Carr's comments about FR-7f, he is a designer of modern high-end cartrisdges under Lyra brand.
This is what he said about why FR-7 series made as headshell-integrated only:
"Here you can see just how huge the magnet structure is, and if you understand cartridge design, the uniqueness of the 7's innards will be very apparent. The magnet structure alone would spill over the body sides of any non-integrated headshell MC cartridge (at least that I am aware of), and underscores why FR never made a non-integrated headshell version of the 7. From my perspective (that of an active cartridge designer), the closest thing to a non-integrated headshell version of the FR-7 was the PMC-3, but even this remained quite a way off. The FR-7 had a radically different coil former (cube-shaped), likewise for the magnetics (dual magnets, quad polepieces). IMO, the FR7s were by far the most interesting of FR's MC designs, but the 7's basic design concept dictated that they would always be big, heavy monsters, suited for relatively few modern arms... My favorite FR-7s are the f and fz. The very low coil inductance of the FR-7 implies that loading can be fairly flexible, so I wouldn't be so concerned with the low impedance. Also, none of the FR-7s are overachievers in detail, and the top end extension is a little curtailed. so the downsides of transformer stepups won't be overly apparent. However, in consideration of the low coil inductance, should you choose a stepup transformer, I would look for a toroidal-core type. FWIW, I've known Isamu Ikeda for many years, and not once has he suggested that the FR-7 was any kind of successor to the FR-1. Even today he appears to remain proud of what he accomplished with the 7 (also the Ikeda 9), but the FR-1 hardly ever comes up in our discussions. " - Jonathan Carr (Lyra)
For those who don't know i can assure that FR-7f has a special LINE CONTACT "Refined Contact Needle" (made in 80s).
You can check the needle on my pictures.
According to the manual for FR-7F: "A unique refined contact needle which specially polished a solid 0.15 mm square solid diamond is adopted as a needle tip. The refined contact needle is a new system that combines the advantages of the line contact needle and the merit of the elliptical needle, making it less susceptible to adverse effects (noise etc.) due to warping of the disk and dust of the sound groove. Also, scratch noise and surface noise are extremely low, so you can obtain playback sound with high clarity and no fatigue."
Everyone is fascinated by the "real" sound of this amazing cartridge. I was very impressed too, it was on my Lustre GST-801 and later on Fidelity-Research FR-64fx tonearms. I've noticed people also use FR-7f on SME, Sony, Micro Seiki, Tomas Schick ... tonearms. The cartridge is heavy low compliance unit, so the heavy tonearm with high effective mass is the best match (or you will have to find an extra heavy counterweight especially for carts up to 30g). Tonearms desidned for SPU cartridges are great for FR-7f as well. You won't be disappointed with FR-7f cartridge, it's a pure magic if your phono stage can handle very low output MC (you can add Step-up trans for MM phono stage).
I am selling my personal FR-7f, it was mounted on my tonearm untill the late of July. Excellent operational condition, amazing sound quality, the original LineContact stylus tip is fine, cartridge body is clean and very good looking. Comes with the stylus protector in the original plastic box with cartridge holder. The box has some sign of wear, but the cartridge is not. The cantilever is straight, but may not be exactly in line with the drawn white mark on the front side of the cartridge body, but it does not effect the sound quality.
Absolutely no problem in operation! Beautiful LOMC cartridge, true classics of the Japanese High-End.
PLEASE MAKE SURE TO CHECK ALL THE IMAGES IN FULL SIZE
Look at the stylus tip, cantilever, cartridge body and box, ask if you need more images!
What you see is what you get!
Fidelity-Research FR-7f specs:
■ Price in 1980 was 77,000 yen
■ Power generation method: MC type cartridge
■ Output voltage: 0.15 mV (3.54 cm / sec., 45 °)
■ Output voltage: 0.2 mV (5 cm / sec., 45 °)
■ Output power: 2 × 10 -8 W (5 cm / sec 45 °)
■ Needle pressure: 2 g to 3 g
■ Load impedance: 3 Ω
■ Coil impedance: 2 Ω
■ Playback frequency: 10 Hz to 45 kHz
■ Channel separation: 28 dB (1 kHz)
■ Channel balance: 1 dB (1 kHz)
■ Compliance: 7 × 10 -6 cm / dyne (100 Hz, 20 ° C.), the compliance measured at conventional 10Hz will be about 13cu!
■ Tip: 0.15 mm square Refined contact, Solid Diamond needle (LINE CONTACT)
■ Weight: 30 g
*** FREE REGISTERED MAIL WORLDWIDE (WITH INTERNATIONAL TRACKING NUMBER).
*** PAYMENT: I will invoice the buyer via PayPal, but i do not accept Euro, ONLY USD (i will use XE online currency converter for the actual currency rate on the date of purchace). Check my ebay feedbacks!
*** Declared value: just tell me the amount you want to be declared for custom control and i will do that.
Used FR-7f cartridge in EXCELLENT CONDITION and original box