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Details about  TUBE AMP/PREAMP DAMPERS FOR 12AX7/12AU7/12AT7/ECC83/EL84/6922/EL84/5751/5687

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TUBE AMP/PREAMP DAMPERS FOR 12AX7/12AU7/12AT7/ECC83/EL84/6922/EL84/5751/5687
Item Sold
Item condition:
--not specified
May 22, 2012
US $8.99
$3.95 Standard Shipping | See details
Item location:
Miami, Florida, United States


eBay item number:
Seller assumes all responsibility for this listing.

We are very pleased and proud to report that on January 5, 2012 we celebrated our 14th year of selling on eBay!  Please check our 14 years of eBay feedback.  Thanks to you for your continuing support!


This auction is for ONE SET OF EIGHT HEAVY DUTY HIGH MASS VACUUM TUBE DAMPERS.  The winner of this auction will receive eight dampers for each item won at a cost of just $8.99 for the complete set of eight dampers.  If you need more than eight dampers, just bid for more than one set. Shipping on extra sets shipped in the same package is free both in the U.S. and Internationally after postage is paid for the first set.


These dampers are designed to fit 9 pin vacuum tubes.  Most audiophiles and musicians use two dampers on each tube.  These vacuum tube dampers are constructed of aerospace quality silicone with a temperature rating of over 400 degrees F.


So this set of eight dampers will improve the sound of four tubes if you use two dampers per tube as recommended, or improve the sound of eight tubes if you would like to try one per tube.  This is one of the easiest, lowest cost ways available to improve the sound of your system.


The use of these vibration dampers is especially important for audiophiles as the small vibrations in the listening room can adversely affect the quality of the sound from the system.  These dampers are also very important for musicians because the levels of vibration in your amps while performing, are even greater than in audiophile amps.


These heavy-duty high density dampers will fit the following and other similar size 9 pin vacuum tubes such as:  12AX7/ECC83, 12AU7/ECC82, 12AT7/ECC81, 12BH7, 12BY7, EL84/6BQ5, 6922, 7199, 5687, 6CG7/6FQ7 etc.






Please read some comments I have received about these dampers from folks who have recently purchased these dampers from me:



Well respected audiophile and frequent audio reviewer, Lok Lowe., of Australia writes:


"If I was to make an overall general comment on the improvements gained from these dampers, I would say that any well recorded musical instrument that is either percussion or string will see improved clarity or detail of the notes being played.  In my case with using a valve headphone amplifier, I also noticed in various tracks that the soundstage became a little wider as well.Lok Lowe., Brisbane, Australia  For a very interesting and full review with specific songs auditioned using these dampers received from me, please email me for a link to Lok's review of these dampers.


A very discriminating audiophile, Andrew Chester O., of Hong Kong writes:


"Hi Sandy, Many thanks for the prompt shipping of the tubes.  I received them today along with the tube dampeners.  I think these dampeners are great, I may order some more from you in the future as i am going to be on leave the day after tomorrow…BTW, would you put two dampeners on each tube?  For now I put one dampener on each preamp tube and one on each EL84 power tube, there is indeed a noticeable improvement on the quality of the sound…"  Andrew Chester O., Happy Valley, Hong Kong


Jazz Guitarist, Robert L., of Los Angeles writes:


"Sandy, I want you to know that I installed two of your dampers on all the 12AX7s, the single 12AT7 and both EL34s in my Bogner Shiva combo guitar amp.  The result amazed me.  I really did not think something like this would make any difference, let alone such a significant difference.  The improvement must have something to do with the fact that in a combo amp, the speaker will vibrate the tubes.  I cannot understand why manufacturers do not use these as stock equipment.  I'm totally impressed!"  Robert L., Los Angeles, CA   (Note to Robert:  We now have 4 major equipmenet manufacturers using our dampers OEM on their amps.)


Musician Michael Whitehouse, of Shepardsville, KY had this to say:


"These tube dampers are a really good product, they caused my amp to sound more focused, with a lot more note definition and overall clarity.  My amp had more zing in it's sing, again the clarity and note definition in chordal playing was noticeable even to my wife!


I like my gain set to around 1 o'clock on the dirty side of my Classic 30, and it was like somebody turned up the gain as far as the playability, but yet it maintained the overall medium gain tone that I like, if that makes any sense.


These tube dampers are a true low priced enhancement to the overall sound and feel of your tube amplifier and guitar set-up, seriously.


I know I have went on and on like an OCD patient, but this is a very good product that will truly enhance the sound and playability of your current guitar and amp set-up for a very small amount of money.


My testimonial for these tube dampers is my way of thanking Sandy Levy for such a good product and hoping it will convince some of you guys to make the purchase for yourselves."  Sincerely, Michael A. Whitehouse, Shepardsville, KY



Keyboard Musician Darrell Walker of Fort Worth writes:


"Hi Sandy,  I did get the Mullard 12AU7 tubes last Saturday.  Thank you for the tube dampers.  As you know I have installed these tubes in two Leslie 122 speakers for my Hammond B-3.  I don't exactly know where to give all the credit, to the Mullard tubes, the dampers or I suspect both.  The Hammond sounds better than ever, wonderful.  I have spent a lot of time and money on these Leslies trying to achieve this sound.  This installation has definitely been the crowning jewel.  Thank you so much."  Darrell Walker, Fort Worth, Texas.


Audiophile, Sherwin B., of New York writes:


"My pair of McIntosh MC60s never sounded better! I just put two of your dampers on all the input tubes and two on each of the 5U4s and one each on the 6550s.  It is hard to believe that for just a few dollars, I have such a great improvement in my system!  Thank you!!"  Sherwin B., NYC


Audiophile Dan P. of the UK emailed me the about my High Density Vacuum Tube Dampers that he used on his X-Can V3 Headphone Amp (please see my other auctions for the JAN Philips 6922 tubes):


"Hi Sandy, Just a quick email to say thank you!  The packaging was really good and everything arrived in mint condition. I'm impressed with how quick the valves arrived from America.  After allowing them to warm for an hour, I gave them a try in my Musical Fidelity X-Can V3 last night. The Jan Phillips 6922 valves know how to capture every little detail! Such a warm and full bodied sound!  I had never previously used the tube dampers, but they do seem to stop feedback through the tubes.  How many more of the valves do you have? Do you get them often?


Thank you for the Valves and tube dampers!"


Dan P., Brierley Hill, West Midlands, UK


Below is Dan's photo of his X-Can V3 with my JAN Philips 6922 tubes installed along with my High Density Vacuum Tube Dampers:






Unlike some other sellers, we only sell one thickness of tube damper.  We only sell dampers of the heaviest thickness available.  This is because through testing and experimentation, we have determined that in order to obtain the maximum benefit from tube dampers, you need to use the heaviest mass damper available.  Why bother at all if you are not going to get the maximum effect?


NOTE: These High Density/HIgh Mass dampers will not interfere in any measurable way with the proper dissipation of heat from a vacuum tube when two dampers per tube are used as recommended and the approximately 34 sq. mm area that these dampers cover, will not measurably affect tube cooling.  In fact, these dampers also absorb heat and will contribute to the cooling of the vacuum tube.




Some folks have compared Vacuum Tube Dampers to shock absorbers on mechanical devices such as automobiles.  I have discussed this comparison with vacuum tube engineers, and they tell me that this is a false analogy.


For example with an automobile, you want to “feel the road” to some extent.  With vacuum tubes, you never want the tubes to “feel the vibrations” or have any microphonics.  A totally dampened tube is very desirable (if not fully attainable).  When vacuum tube engineers design these tubes, vibration and microphonics are not factored into the equation.  Overdampening a speaker will dull out the sound, but that is not the case with vacuum tubes.  Internal vibrations within a tube’s mechanism are never good, and even small ones will diminish the quality of the sound.


Engineers who have designed tubes have told me that a totally vibration free tube is the “Holy Grail” to which the design engineers strive.  In a high-quality tube design, vibration free supports and thick mica insulators are what is specified…not thin supports and thin mica to allow vibrations.


This philosophy has been explained to me by a retired Vacuum Tube Engineer who worked for RCA designing vacuum tubes during the 1950's and retiring in 1968.  He is also an audiophile and we have had some very interesting discussions about tube design.  I also have a distant relative who worked for Raytheon in tube design, and although he mainly worked on transmitting tubes, he also echos the same philosophy about microphonics.


Microphonics to any extent are not desirable, and the very best sound comes from tubes where the microphonics are not detectable.  Hence our decision to market only the highest density dampers.




Microphonics is a characteristic of all vacuum tubes to some extent or another, when in use.  Microphonics occur when vibrations (both small and large) to the internal parts of the tube, affect the way those internal components process the electron flow through the tube.  We normally only hear about microphonics on defective tubes or very inexpensive tubes, but the truth is, that microphonics are almost always present even in the best and most expensive tubes.  Normally we do not notice the effects of microphonics with quality tubes, but after listening to your system with these tube dampers installed, you may very well be able to hear the small but important improvements in the sound.




As stated earlier, we have learned that there is little point in using a vibration damper with low mass.  Therefore, we are only offering the heaviest mass dampers available.  The tube sizes that these heavy-duty dampers will fit are listed above.  Please see my other auctions for sizes to fit power output tubes as well as rectifier tubes.




I have been involved with vacuum tubes since the mid 60’s and I have been selling tubes on eBay since Jan. 1998.  I believe my feedback reflects my dedication to selling only the very best products and to my commitment to total customer satisfaction.


Please email me using the "Ask Seller a Question" link above with any questions.



Feel free to check my feedback and bid with confidence.  Please email with any questions before bidding.  We Visa, MasterCard, Discover and American Express through PayPal.  NOTE: We also accept your Visa or MasterCard from anywhere in the world via  We reserve the right to reject bids from those with negative or hidden feedback. If you fall into this category, please email before bidding! We also reserve the right to declare this auction null and void if eBay is not accessible during the last three hours of this auction.




(New Postage Rates Effective May 14, 2007)

Flat rate shipping (no matter how many dampers you have shipped at the same time) VIA USPS First Class Mail within US including Alaska and Hawaii with a normal 2-3 day delivery is $3.95 including a USPS Delivery Confirmation Number emailed to you when shipped.  First Class shipping to Puerto Rico is also $3.95.  If your invoice does charge you more than one shipping cost for multiple damper orders, please adjust accordingly or email me for an adjustment to shipping cost.  98% of our items are shipped the same day or day after payment is received.


Airmail First Class Mail International (4-7 days transit time) shipping outside the U.S. is a flat $7.99 no matter how many dampers you order as long as I ship all together. 


This means that for INTERNATIONAL SHIPMENTS, including the extra time required to fill out the CUSTOMS FORMS, we charge $7.99 to ship one pack or 10 packs, or 15 packs or even 100 packs will still cost just $7.99 to ship Internationally.  This includes packing materials.  Therefore the actual postage on the package will very likely NOT be $7.99 if you purchase one pack but if you purchase more packs it will probabaly cost us more than $7.99  but we will still only charge you $7.99 in order to simplify & speed up the eBay billing and shipping process.  This policy on flat-rate shipping cost allows us to keep the cost of the dampers themselves as low as possible.





Due to NUMEROUS AND REPEATED problems with the speed of Italian Customs & Post Office, we cannot respond to questions about shipping via First Class International to Italy for SIX FULL WEEKS after the ship date.  If your item is being shipped to Italy via First Class Mail International, please do not email asking about delivery until 6 weeks have passed from the date of mailing.  We have had repeated problems with Customs in Italy and buyers in Italy then email us that they have not received their goods.  Then...after many emails back and forth during several weeks, the item always shows up.  This delay is not caused by us and even though we would love to help, there is truly NOTHING we can do about it.  It is the Italian Postal System & Italian Customs that are causing these delays!  Other sellers are simply refusing to sell to Italy.  We do not want to do that, although we will be forced to if there are consistent problems.  We sell many items to customers in Italy!  We love our many friends and customers in ItalyYou are WELCOME to bid on our items, but please understand and abide by these terms.  If you need your item sooner than 6 weeks, please ask us for the cost to ship via Express Mail International which takes about 8-10 days to Italy.  Thank you for your understanding!


Please click on: "View Seller's Other Auctions" for more interesting items. Please check my feedback and bid with confidence. Good luck & thank you for bidding. You may pay for this item on your Visa, MasterCard, Discover or American Express card at no extra charge through PayPal. If you use PayPal Instant Payment, I will get immediate payment and be able to ship without waiting for your payment to arrive.   Thanks and Good Luck to all!




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