Vacuum tubes are not the only components that suffer from distortions caused by microphonic vibrations. Capacitors and other electronics produce distorted signals in the presence of vibrations, adding fuzz, glare, sibilance, and other anomalies to the musical signal. Micro-electronic devices and processors in today's digital gear are acutely susceptible to these distortions.
Reduction of analog distortions caused by microphonic vibrations results in a more natural musical realism. The enhancement is a definite upgrade to a higher realm of audio appreciation.
Unlike rubbery feet that tend to dull higher frequencies and cause ill-defined or "bloopy" bass - or metals, ceramics, graphite and other rigid coupling devices that produce unique sonic signatures and harsh dynamics, Herbie's proprietary contra-vibrational products allow your components to deliver the goods as they are engineered to do.
Tenderfoot: Herbie's overall best, most versatile, most popular footer!
Tenderfoot can be used either side up.
Tenderfoot: Individually molded with a proprietary platinum-cure silicone blend formulated in-house in consultation with Wacker Chemie AG of Germany for maximum micro-vibration absorption. Recommended for audio and video components weighing from 2 to 220 pounds (100kg).
Particularly well-suited for CD/DVD and SACD players, DACs, Blu-ray Players, preamps, power supplies and conditioners, turntables, and power amplifiers. Delivers a full-bodied and quick, highly articulate result with amazing linear extension. Works equally well with solid-state and tube components. Does not "ooze," mar, or discolor surfaces. A thin decoupling grungebuster Dot is adhered to the base of each Tenderfoot.
Two versions available:
TenderSoft: for components weighing 40 pounds or less (18kg)
Extra-Firm: for components of virtually any weight up to 220 pounds (100kg).
Dimensions: 1.1" x 1.1" x .65" tall. (28mm x 16.5mm). Default recommendation: four Tenderfoot isolation feet per component.
Though scarcely ever really needed, pressure-sensitive adhesive is an available option.
TenderSoft or Extra-Firm: $1449 ea.
( 8 or more: $1399 ea.)
Tenderfoot isolation feet work best in direct, intimate contact with the bottom of the component chassis, not under the factory feet.
Tenderfoot isolation feet are the stock footers used with Purity Audio Design Statement Series preamps ($19,495-$31,995), Purity Series preamps ($25,995-$52,995), and new PS300B Ultra mono bloc amps.
Big Tall Tenderfoot: Big and Beefy, yet as delicate as a butterfly
Big Tall Tenderfoot: Same as above except molded extra tall to lift components free of tall factory feet. Also great for turntables having severe footfall or other macro-vibrational issues. Superior upgrade for AR, Thorens, and VPI suspension springs.
Two versions available:
TenderSoft: for components weighing 40 pounds or less (18kg).
Extra-Firm: for components of virtually any weight up to 250 pounds (115kg).
Dimensions: 1.18" x 1.18" x 1.02" tall. (30mm x 30mm x 25.9mm)
Big Tall Tenderfoot
TenderSoft or Extra-Firm: $1649 ea.
( 8 or more: $1599 ea.)
Cone/Spike Isolation Bases Soft Fat Dots
For tiny components
Which feet to choose?
Because there are so many system variables involved with audio reproduction, it's not always possible to predict which isolation product will work best in any given situation. Recommendations listed above are generalized only, not exclusive. Herbie's isolation feet, however, perform superbly over a broad range of audio parameters. They are not too picky about what kind of rack, shelf, or weight load they are working with. All perform the same function: to reduce microphonic vibrations and hold electronic components firmly so that the true potential of those components can be revealed. Virtually all audio and video components perform superbly with Tenderfoot isolation feet, our default component recommendation. (For loudspeaker isolation, we recommend Herbie's dBNeutralizer-based products.)
What it is:
Herbie's isolation materials are proprietary blends of silicone-based elastomers with varying compliance and firmness qualities. Herbie's compounds are not dependent on a precise weight load to be most effective. They are equally effective under a wide range of weight and, because of their loosely cross-linked structure, have little or no resonant "coloration." Invented and formulated solely for audio and video applications, these unique materials are unsurpassed in their ability to absorb micro-vibrations and reduce audio distortion. Materials are residue-free, with excellent dielectric properties.
Herbie's SuperSonic fluorocarbons are proprietary composites developed for absolute sonic neutrality and vibration-absorbing ability.
dBNeutralizer(tm) is a composite of platinum-cured silicones with barium sulfate and silica fillers.
(Shore A durometer)
Temperature Range: TenderSoft
28 1/2 to 20 lbs
(1/4 to 9kg)
50 lbs/4 footers
75 lbs/5 footers
12 grams 1015
−80ºF to 420ºF
(−62ºC to 216ºC)
50 4 to 100 lbs
(2 to 45kg)
220 lbs/4 footers
300 lbs/5 footers
12 grams 1015
−80ºF to 420ºF
(−62ºC to 216ºC)
Iso-Cup 80 4 to 140 lbs
(2 to 64kg)
300 lbs/3 Iso-Cups
400 lbs/4 Iso-Cups
24 grams 1015
−20ºF to 400ºF
(−30ºC to 204ºC)
Stabilizer 94 0 to 500 lbs
(to 225 kg)
supports 500 lbs
stabilizes 24 pounds**
156 grams 104
−450ºF to 500ºF
(−268ºC to 260ºC)
*Considers component weight is often unevenly distributed and other factors.
**In conjunction with compliant feet; actual result will vary depending on chassis thickness and other factors.
90-day money-back trial period. Lifetime Warranty! Herbie's isolation feet are guaranteed to improve the performance of audio and video components by reducing vibration-induced distortion. Give them a try - you'll be surprised how great-sounding your present equipment is!
-Comments-Name: Philip B
Message: Are you suggesting in your description of Tenderfeet that they replace the spring/suspension in an AR turntable? I have a Merrill/(beefed up AR clone). If that indeed IS your meaning, would I t hold for the Merrill? Any specifics? Thanks. I am just now awaiting shipment of some Giant Fat Gliders for my Felton Pendragons and after taking them need to look to source components. Thanks again....
Webmaster's reply: Yes, the description means what it says. If the Merrill has similar suspension springs, Big Tall Tenderfeet can be used to replace the coil or Sorbothane stock springs.
Message: Hi, what isolation and stabilizer (if applicable) combos would you suggest for my following gear?
1) Audio Research SP14 preamp
2) M2tech Young DAC
3) Pioneer PD-59 CD Player
4) Pioneer PLX-1000 turntable
Webmaster's reply: Hi, Kevin. I recommend four Tenderfoot isolation feet for each of the components mentioned (refer to the product description and choose either TenderSoft or Extra-Firm, regular or Big Tall as applicable for each--Big Tall version only if you need the extra height to lift the component free of its stock feet). A SuperSonic Stabilizer or two on top of the preamp and CD player would be additionally beneficial. For the turntable, I recommend upgrading to a 285mm-diameter Way Excellent II-3mm Turntable Mat. With the Way Excellent II mat, you shouldn't really need a Stabilizer or clamp, though either can be used at your preference.
Message: Hi Steve,
I have ordered different products on at least 3 or 4 occasions in the past from you and are very pleased with your products. I have a high quality system including Classe CP-800 pre/Dac, CA-2300 power amp and CDP-202 player. Also, Magnum Dynalab MD-106 triode fm tuner and MD-609triode XM receiver and all the tubes have your dampers. I now decided to take out my 35 year old turntable (from storage), a Marantz 6200 and cleaned it. I replaced the belt and put a Shure M97xE cartridge and a Pro-ject USB V phono amp. There is no suspension left on the turntable, it just sits on it rubber feet. The sound is ok but does not even compare to the sound from the XM receiver. Do you think that it is worthwhile to invest to improve it's sound or am I better to purchase a new turntable like a Pro-ject carbon debut and replace the mat on it? I am not even sure that I will get back into listening a lot of vinyl as it is more work than just sitting back and use a remote. I also use a computer and download Hi-rez from HD Tracks. Thanks in advance for your advise.
Reply: The 6200 is a pretty nice table; assuming only occasional use, you'd probably be better off to fix it up a little. Allow lots of hours for the new cartridge to break in and work with VTA and tracking force to get best parameters working for you. Upgrading to a 4mm Way Excellent II Turntable Mat will help compensate for lack of suspension (and replace the suspension springs with Big Tall Tenderfeet, if applicable). Upgrading the footers to Tenderfeet would be beneficial as well. If you listen to much original analog-recorded vinyl, it's absolutely worthwhile fixing up to play vinyl. If you only listen to digitally mastered vinyl and/or digitally mixed or remastered re-issued lp's, you might be just as well to listen to digital sources, assuming you have excellent DAC/playback gear.
Message: Hi,can you tell me how much will cost me 8 piece of Tenderfeet,I think it will be ok..I have Integrated Amp Musical Fidelity ,and CD Marantz,do you send it to Croatia...
Webmaster's reply: Total for eight Tenderfoot isolation feet with USPS Express Mail shipping to Croatia would be $153.55.
Message: Hi, I spent the last year or so in fine tuning my power (cables, distribution box, fuses) and the last thing to do is vibration control/suppression. I have a NAD M51 dac and a Bryston BHA-1 headphone amp. Both components weighted around 10-12 pounds each. They are on glass shelves. What are you suggesting for my application? Thanks.
Webmaster's reply: Four Tenderfoot isolation feet under each of the components would be a good start.
Message: I am considering adhesive backed baby booties as footers for external crossovers that weigh about 4-5 pounds each. Would 4 on each be the best approach?
Webmaster's reply: Sure, four Baby Booties under each crossover should do very well. Alternatively, four small Extra-Thick grungebuster Dots would do very well also.
Message: Hello, I'm relatively new to all of the Audiophile nuances and equipment articulation. I was considering other products for system isolation, however you all seem to know what's really going on. I'd like a recommendation for a 50 lb tube integrated as well as a 5 lb aluminum alloy dac and 1 lb digital transport. I realize the tenderfoot seems to be the drug of choice for most, however I'm considering the iso-cup with super sonic hard ball, or the medicine ball.. gosh you seem to have a lot of solution options... What should I do to make those transformations I'm reading other to have experienced happen to me?
Webmaster's reply: Hi, Josh. I recommend four Extra-Firm Tenderfoot isolation feet for the amp and four TenderSoft Tenderfeet each for the DAC and transport. Optional Big Tall version of Tenderfeet is available just if you need the extra height to lift the component free of its stock feet.
Iso-Cups w/SuperSonic Hardball usually do very well with amplifiers and other components, especially tube amps--with an integrated, Tenderfoot isolation feet are the
more sure bet, though. Regardless, sonic differences between Iso-Cups and Tenderfeet will vary somewhat from one system to another, according to system variables
and synergies and according to personal preference/taste, with neither having any inherent superiority over the other.
A damping instrument on each of the amp tubes is also highly beneficial (if output power tubes, an appropriate UltraSonic Rx is recommended for each; for most
input/driver tubes, UltraSonic SS or UltraSonic Rx can be used) with excellent results.
MedicinBalls are primarily platforms configured to accept 1-7/8" balls. For most audio components, Tenderfoot isolation feet are ideal, especialy DACs and CD players.
Our website descriptions and recommendations are simple and straightforward. Isolating your audio components (speakers, too), when done properly, brings out more of the inherent potential of the audio gear you already have, rendering a musical reproduction that's more faithful to the originally recorded event.
Name: Fernando Martins
Message: Dear Herbie,
I have 2 components to isolate : SLI-80 integrate amplifier and a CD Player 303 T pró. What's you recomend ?
Webmaster's reply: Four Tenderfoot isolation feet under each component (Big Tall version if you need the extra height to lift the component free of the stock feet). A SuperSonic Stabilizer or two on top of each component is additionally beneficial.
Message: I love the Way Excellent II 2mm turntable mat and big tall tenderfoots I purchased. The severe footfalls that degraded the music when anyone walked into or out of the music room has largely stopped. I have placed them under my turntable (Project carbon debut) body and the turntable feet are very slightly lifted off the surface. Have I set it correctly? Or do I need to remove the turntable feet?
Webmaster's reply: As long as the stock feet are not touching the shelf or just scarcely touching without holding any of the weight, you're fine and shouldn't have to remove the stock feet. Removing the stock feet allows greater versatility for placement of the Tenderfoot isolation feet, but is usually not necessary. Tenderfeet can be given a height boost, if you like, by placing felt, cardboard, hardwood, or other material under them.
Message: I just received the tenderfeet, stabilizer wights and way excellent II mat. It solved all my issues with the turntable and now plays at all volumes without vibration / rumble. Thanks, they are awesome.
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