RIVERA Knucklehead K-TRE 100W Head ULTIMO Tube Set Big Bottle 6CA7 Gold Pin Pre

RIVERA Knucklehead K-TRE TOP 100W Amp ULTIMO Tube Set EL34/6CA7 Click any image to see it full size Item Description

Amplifier/Receiver Manufacturer:

KNUCKLEHEAD

Model:

K-TRE 100

Description:

100 Watt amp with our ULTIMO (best sounding, top-of-the-line) tube set with "Big Bottle" 6CA7/EL34 matched power amps driven by gold pin preamps for screaming sound!

Make your amp rock with this tube set!

Amp Bias Type:

adjust if needed

Tube Quantity in ( )

Rectifier Tubes:

none

Preamp Tubes (matched):

12AX7/ECC83 (5) - JJ/EHX gold pin matched and balanced for rich and creamy tones

Power Amp/Driver Tubes (matched):

6CA7EH (4) - EHX "Big Bottle" EL34 - matched quad

Total Tubes in this set:

9

This listing is our ULTIMO (best sounding, top-of-the-line) tube sets. Great tone from matched and balanced gold pin preamps for longer life, screaming tones - yet smooth when you want them. These hot preamps drive a matched quad of "Big Bottle" 6CA7/EL34 power tubes with big plates for thundering bass when you want to push her hard!

Let this tube set rock your amp!

Power Tubes:

EHX 6CA7EH/EL34 on steroids!

Our customers like the Electro Harmonix (EHX) 6CA7 "Big Bottle" version opf the EL34 - great bass tone and subtle mid and highs.

To compliment the power amps we use the top rated Electro Harmonix or JJ 12AX7/ECC83 silver pin preamps which are computer matched and balanced for excellent sound reporoduction. The silver pins are reliable and economical and are a good value. For the 12AU7s we use JJ/EHX or USA made tubes for best sound and depth of field.

Treat yourself and your audience to the a great sound tone with this tube set!

Suggestions for operations

These tubes require about 200 hours of use in your amp to establish their long term sound characteristics which are often different from their initial sound.

Configuration

We base all our tube set brand configurations on the basis of feedback from 1,000s of customers over the past 15 years. We offer multiple grades of tube sets at various price points because we know that you want choices to fit your budget. Unlike any of our competitors we also buy back your old tubes (see details below) so you get an even better overall net price on our new tube sets.

We have 5 grades of tubes sets for all budgets:

VINTAGE (uses NOS (new old stock) vintage tubes from the past, usually made in USA or Europe, and assembled into great sounding sets to replicate the vintage tones from tubes of the 1960s to 1980s)

ULTIMO (best sounding and top of the line using gold pin tubes and top current production brands, longest lasting, most reliable) - usually preferred by professionals and audiophiles who want the best performance overall

PRIMO (higher rated tubes and still good value and good sound) - these sets are our most popular and work well for beginners to pros who desire good sound for a good value

GENERIC (best value and good sound from current production brands) - great for backup sets or to retube an am before you sell it. Also great for Metal music players/listeners who want lots of distortion from high gain preamp tubes

RECYCLED (Prevously enjoyed, many vintage tubes wth good remaining life and suitably priced - great for backup sets)

Need a different configuration of tubes or different brands? Drop us an email and we will be glad to put a custom set together just for you!

On a budget and really need a set of tubes? Checkout our RECYCLED tube sets of prieviously played tubes with lots of remaining life - great for spares or budget minded musicians.

$ $ We will PAY YOU CASH for your old trade in tubes - see details below! $ $

With over 13,000 customers and 13 years of providing great value for musicians all over the world, we think you will love our product and customer service.

Remember we always offer:

Shipping Details

Combined Shipping: We do combine shipping for all items bought within several days – so save on shipping costs and pick up another item! Before paying, please wait for a combined shipping invoice from us to take advantage of this benefit.

Domestic (U.S.A.) Shipping:

TUBEMEISTER ships via USPS Priority Mail and Express Mail to confirmed PayPal addresses only. Email tracking information is available and will be sent to your Paypal or eBay email address when the package is shipped. If you have a question about shipping for your item, we prefer communication via eBay messaging (not paypal email address!) so that we can keep track of your concerns within our eBay family. WE DO NOT SHIP TO NON-CONFIRMED ADDRESSES OR ADDRESSES DIFFERENT FROM YOUR PAYPAL ADDRESS!

We usually ship daily during Monday through Friday unless we are away from the office on a trip. Notification for our long trips is posted in our store and on all of our auctions to alert our customers when their item will be shipped. We accept purchases and orders everyday, 24 hours a day. Domestic priority delivery times are typically 7-10 days after you are notified of the shipping date. If you need it fast, choose the Express Mail option.

International Shipping:

Since many of our items are fragile, high value and paid via Paypal, TUBEMEISTER only ships via USPS Priority Mail International or Express Mail. Priority Mail International is preferred for our customers, since it is faster and safer (tracking) . We declare that the contents are "Vacuum Tubes" (if applicable) on the customs slip at full purchase price value. Listing shipping quotes do not include international custom’s fees which are the responsibility of the buyer and are often collected by the international delivery service. Buyers will pay custom’s fees on the declared value or insured amount. We do NOT declare customs values less than the listing amount!

You can determine the international shipping to your country by using the shipping calculator at the top of the auction. Choose your country and click the “UPDATE” box for rates to your country.

PLEASE ALLOW 2 TO 6 WEEKS FOR INTERNATIONAL DELIVERY. WE HAVE EXPERIENCED LONG DELAYS UP TO 90 DAYS THROUGH CUSTOMS FOR ITALY, FRANCE, GERMANY, CHILE, BRAZIL AND OTHER NATIONS. CHECK WITH YOUR CUSTOMS OFFICIALS OR LOCAL POST OFFICE IF YOU EXPERIENCE A DELAY IN SHIPMENT. IF YOU WANT TO TRACK YOUR SHIPMENT YOU WILL HAVE TO USE PRIORITY MAIL INTERNATIONAL OR EXPRESS MAIL INTERNATIONAL DELIVERY, OTHERWISE NO TRACKING IS AVAILABLE. DUE TO EBAY POLICIES WE NO LONGER SHIP FIRST CLASS MAIL INTERNATIONAL.

Payment Details

PAYMENT POLICY:We prefer payment via PayPal (fastest). You can also use credit cards or e-checks thru the PayPal system.

IF YOU ARE PAYING WITH PAYPAL, WE ONLY SHIP TO PAYPAL CONFIRMED ADDRESSES. IF YOUR TOTAL PAYMENT (OF ALL ITEMS PURCHASED FOR COMBINED SHIPPING) IS OVER $150, WE SHIP ONLY VIA DELIVERY SERVICES THAT GENERATE A TRACKING NUMBER AND REQUIRE A SIGNATURE CONFIRMATION UPON DELIVERY. IF THE ITEM IS LESS THAN $150, WE DON’T REQUIRE A SIGNATURE CONFIRMATION, BUT RECOMMEND PRIORITY MAIL.

Combined Shipping: We do combine shipping for all items bought within several days – so save on shipping costs and pick up another item! Before paying, please wait for a combined shipping invoice from us to take advantage of this benefit.

Additional Information

TERMS OF SALE: By bidding on this auction, you acknowledge that you have clearly read this eBay auction and you understand and agree to the terms and conditions and any Warranty, Condition and Return policies stated.

BIDDING POLICY: We are committed to customer satisfaction and look forward to a mutually successful transaction with all bidders and winners. If you dont see the tubes you want please ask us a question on this auction and tell us what you want. We will check our inventory and create a custom auction with a "Buy it now" price just for you.

About Us

ABOUT TUBEMEISTER

We specialize in Analog/Digital Audio Systems, vacuum tube sets and electronic components for many Audio and Radio Frequency (RF) applications including vintage guitar, organ and harp amplifiers, sound effects, mono and stereo HIFI, pro audio, and ham radio.

Our pre-packaged GENERIC, PRIMO and ULTIMO vacuum tube sets use a combination of vintage tubes from the 1940’s to new tubes of the present. All of our tubes are tested, matched when necessary and carefully placed into custom tube sets for our customers at everyday affordable prices.

We often get tubes into our tube lab that are decades old it and it is hard to determine if they are New in the Box (NIB), New Old Stock (NOS), bulk lots sold without boxes, or replacement tubes with great life still left in them. Our extensive experience and comprehensive testing means we throw out a lot of old and new tubes if they test below minimum “NEW” reading on our calibrated tube testers or they don’t pass the LIFE TEST. You can be assured that all the tubes we sell are NIB/NOS or tested new or better according to manufacturer standards. MATCHED TUBE SETS are matched first for manufacturer (tube code, not label) and then for gain/current draw.

We don’t always specify the brands sold in PRIMO Tube sets since we want to give you the BEST VALUE for the price. Some tube sets have brand options such as EHX = Electro Harmonix, JJ, GNLX (Genalex), VA = Valve Art, Russian and the choice is ours unless you specify a brand preference prior to shipment. With over 10,000 satisfied customers our quality control, selection criteria and value pricing have proven results, so we are confident that you will be pleased with your purchase.

For customers who want specific tube brands, these are often available as individual or matching tube sets. Click on the Individual Tubes by Brand or Individual Tube Sets by Type links to the left of this description for a great selection or ask us before you bid.

We arrange all the individual tubes we sell into several classes to make it easier to find what you need. The classes include

Class

Examples

Rectifiers

2D21, 3B22, 3B24, 3B28, 5AR4/GZ34, 5U4, 5V4, 5Y3, 5Y4, 5Z3, 6CA4/EZ81, 6V3, 6V4/EZ80, 6X4, 6X5, 12X4, 35W4, 35Z5, 0A2, 0B2, 0C3, OD3, 80, 83, 412A, 866

Preamp Tubes

6AB4, 6AF4, 6AK5, 6AL5, 6AN8, 6AQ8, 6AT6/6AV6, 6AU6, 6BA6, 6BE6, 6BF6, 6BH6, 6BJ6, 6BJ7, 6BJ8, 6Bk7, 6BL8/ECF80, 6BN4, 6BN6/6KS6, 6BN8, 6BQ7/6BZ7, 6C10, 6C4, 6C5, 6CB6, 6CG7/6FQ7, 6CS6/EH90, 6CW4/6DS4, 6CW5/EL86, 6CX8, 6D10, 6DE7, 6DL4/EC88, 6DJ8/6922, 6DR7, 6EA8, 6EQ7, 6EU7, 6EW8, 6FG6/EM84, 6GC5, 6GH8/6U8, 6GK5/6FQ5/EC97, 6H6, 6H30Pi, 6HA5, 6HR6, 6HS6, 6HU6/EM87, 6J5, 6J7, 6JC6, 6JK6/6JL6, 6JH8, 6K11, 6N1P/6H1N, 6N7, 6SC7, 6SA7, 6SH7, 6SJ7/6J8, 6SH7, 6SK7, 6SL7/6H9C, 6SN7/6H8C, 6SQ7, 6U10, 6V4, 12AU6, 12BA6, 12BE6, 12BH7, 12AT7/ECC81, 12AU6, 12AU7/ECC82, 12AV7, 12AX7/ECC83, 12AY7, 12BH7, 12BZ6, 12FQ7, 12DW7/7247/ECC832, 403A, 407, 417A, 417B, 6973/6CZ5, 7199, 6267/EF86, 5691, 5692, 5693, 5751, 5879, 6350, 6414, 7119, 7233, 7360

Power Amp - Audio

6AQ5, 6AS7G, 6BQ5/EL84/6P14, 6F6, 6K6, 6L6GC/5881, 6V6/6N6C, 6CA7/EL34, 6550/KT88, 7591,7027, 6BM8, KT66, KT77, 6GW8/ECL86, 6Y6, 50C5, 12AQ5, 25L6, 35L6, 45, 50L6, 7868, 2A3, 300B, 6973

RF Amp Driver

6CL6, 6GK6, 12BY7, 5763, 6360

Power Amp- RF

6146/A/B/W, 6JB6, 6JG6/6KV6/6JR6, 6JM6, 6JT6, 6KD6, 6KV6, 6JS6C, 6LQ6/6MJ6/6JE6, 6LB6, 6LF6, 6LR6, 6LX6, 6HF5, 6GE5, 6GJ5, 2E26, 6883, 8298/A, 572B, 807, 811A, 813, 814, 1625, 12JB6, 8950 conversion kits

Note: we have RF power tubes for most ham equipment manufacturers including Ameritron, Collins, Drake, Galaxy, Hallicrafters, Heath, Johnson, Kenwood, Knight, National, Swan and Yaesu.

Typical tube manufacturers include the following:

USA Made: RCA, Sylvania, GE, JAN, Hammond, Conn, Baldwin, Silvertone, Delco, EIMAC, etc.

Foreign made: Russian Military, Sovtek, Svetlana, Shuguang, Electro Harmonix, JJ Electronics, Winged “C”, and Ruby.

STANDARD and PRIMO Tube sets usually DO NOT INCLUDE manufacturers such as Genalex, Telefunken, Mullard, Phillips, Valco, Western Electric and other high priced tubes. These tube brands are sometimes available as individual or matching sets in the “Individual Tubes by Brand” links of the store or may be available in our ULTIMO Tube Sets category.

In order to offer the best prices for our customers, we may substitute high quality equivalent tubes in our STANDARD and PRIMO tube sets. Click HERE to see a cross reference table of equivalent tubes that are equal or better in performance than the original tubes.

We are an authorized dealer for Electro Harmonix, Tungsol, Mullard, Genalex, Sovtek, and Svetlana products and also supply Valve Art, JJ/Tesla, Ruby and USA NOS tubes for many analog applications.

WE SHIP WORLDWIDE AND COMBINE SHIPPING FOR ALL ORDERS!

We have been selling on eBay for over ten years and get 100s of new customers each month from all over the world. We work hard to establish product quality and value and get the products to you as quickly as possible. We appreciate your business and feedback as it helps us grow to serve you better with new products, better services and great values. If we don’t have a product you think we should carry, please email us and we will try to include it in our store next time you visit. Thanks for visiting and remember to check out the other items in our eBay store!

TUBEMEISTER is NOT an authorized distributor or dealer for parts or services of the amplifier manufacturer described in this auction and our products have NOT been endorsed or certified by the amplifier manufacturer. While many customers have had excellent results using our tube sets and other products, use of the products sold in this listing may void or modify your amplifier manufacturer’s warranty. We provide sets of tubes from various tube manufacturers (usually other than the amplifier manufacturer) that will work in amps described in this auction. If you need genuine parts from the manufacturer of your amplifier, check for authorized dealers and distributors via the manufacturer’s website.

Use of manufacturers name, brand name or other registered trademark or sales mark in this auction are for brand recognition and model description purposes only not to be confused with our trade name or logo. WE DO NOT knowingly infringe on others established intellectual property rights. Anyone claiming such violations for questions or comments regarding usage please contact us.

Copyright 2012 TUBEMEISTER. This page and the contents of the website including all listings and pictures are protected by copyright law, international treaties and Ebay policies. All rights reserved.

Our Refund and Product Warranty

TUBEMEISTER warrants against “DOA” (“dead-on-arrival”) or differences between an item description (exclusive of illustrative pictures) and the items received. Any DOA or defective item should be returned (e.g. in transit back to us with a copy of the invoice) within 7 days of your receipt of the item and notification to us using Ebay messaging for our record. Please include a brief description of the problem and use your eBay ID in all correspondence.

Due to the many variations in circuit components including the condition and aging of capacitors, resistors, etc, we can not guarantee how a particular tube will sound in your equipment compared to your current tubes. Our tube set configurations are based upon customer feedback of tubes that sound good and are the most popular for the amp/preamp/radio. We offer custom configurations by individual request but we dont accept returns for tubes that are fully functionsal but "dont sound good" or "dont look new" (many vintage NOS tubes lose their label when cleaned and we repackage tubes in new boxes when the old boxes are no longer usable).

Occasionally we ship the wrong tube or tube set and we will gladly replace the wrong shipment with the proper item at our cost. We test all tubes prior to shipment and warrant that they test as “new” or better on our calibrated tube tester. Due to differences in vintage tube gear we can not guarantee that the tubes will test the same in your tube tester or will meet the specifications of your particular equipment or are fit for a particular application.

We DO NOT WARRANT the operation of our tubes in defective amplifiers or electronic equipment! If you plug our tubes into your equipment and the tubes fail to light up or flash on power up or otherwise fail and upon return to our labs we measure dead tubes, then you WILL NOT RECEIVE A REFUND for the tubes returned. Make sure your amplifier/electronic equipment is operational before you plug in new tubes (from us or any other vendor). If you are not sure, take your equipment to a qualified technician who can install our tubes correctly.

If you need to return your purchase and request a refund, we do not refund shipping and insurance charges that were incurred to ship the product to you or return the product to us. If your purchase has a refund option (check the auction), we will issue a refund only after the products are returned and have been verified to be the same ones sent and also test new or better on our tube tester. Purchase refunds will be in the same form as purchase payments.

Email and Feedback Policy

Please use EBAYs mail message forwarding system ONLY as we cannot reply to email sent to our Paypal address. We use the EBAY email system to contact you and it works very well for us. Ask questions before bidding about anything concerning the auction and shipping to your location. Communication between buyer and seller makes for a smooth transaction for both of us!

FEEDBACK POLICY: We want satisfied customers and try to give good feedback to all buyers who pay on time and who have given us positive feedback. Our Feedback to you is usually provided when the transaction has been COMPLETED. (We have received payment, you have received the merchandise, are satisfied with the transaction and have given us feedback.) If you have any problem with merchandise or the transaction or late shipment or are thinking of leaving neutral or negative feedback or anything less than a FIVE STAR rating in all categories, PLEASE CONTACT US using eBay messaging so we can resolve the problem to your satisfaction!

We Buy Back Your Old Tubes!

TUBEMEISTER needs your help to save the planet and we will pay you for your efforts by paying for your old tubes after you buy a new replacement set from us. We cringe just thinking about our great customers throwing away their old tubes which end up in the local dump. Many times the old tubes have hours of good life and great tunes left in them for people to enjoy. We set up a tube recycling program where you get cash for your good tubes returned to us. We test and recycle them to new customers at great prices, and the planet has a few less pieces of glass and metal buried for hundreds of years!

Credits typically run a maximum (all tubes reusable) 20-25% of the original tube set prices so you have a real incentive to buy from us and also recycle your old tubes. Ask other vendors to issue a trade in credit and they only laugh at you! We pay you hard cash for your reusable tubes and that is just another reason to buy from TUBEMEISTER! A Recycle form is sent with your tube set and instructions on returning your old tubes.

Customer Support Resources

Smart Tube Buyer’s Guide

Do it Yourself (DIY) Tube Installation

Tube Cross Reference, Bias Values

Auction Terms & Conditions

PRIMO Tube Sets

ULTIMO Tube Sets

Customer Testimonials

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