It's IN STOCK now = get it next day !
Order and pay for your goods before 1:00pm Monday to Thursday and your item should arrive next day. See terms and conditions.
Here we have one BRAND NEW, unopened, boxed matched pair of Mesa Boogie 6L6 GC power tubes / valves. They are the STR440 variety. This is the exact same valves as you get in your favourite Mesa Boogie / Mesa Engineering guitar amp like the Mesa Dual Rectifier, Rectoverb etc etc. They are a matched pair so you don't need to worry about BIAS or technical stuff like that. Just remove the old ones and replace with these !
Description from Mesa Boogie themselves:
The MESA 6L6 STR-440 is our very best overall 6L6 - It is a premium grade, US equivalent and our tube of choice in the production of all new Mesa 6L6 powered models - Remarkable bass definition, articulate mids and shimmering highs keep every note amazingly intelligible, with a smooth, creamy character - Premium structural quality provides exceptional consistency and reliability - Rivals NOS (New Old Stock) durability and sonic character - Amazing for all styles of music.

Our State of the Art Tube Tester
With the brains of a computer and the ears of a musician, Robotube runs a battery of seven exacting tests on each power tube and analyzes performance so thoroughly it can even predict the tube's lifetime. Designed by Mesa Engineering and built for us by an aerospace firm, Robotube is a one-of-a-kind machine and easily the most modern and powerful in the industry.
Lifespan of tubes (valves):

Power Tubes will generally last 1 - 1.5 years.
Preamp Tubes will generally last 2 - 3 years.
Signs of Wear
Power Tubes:
• Low end response is not as clear and distorts earlier.
• You turn your amp’s master volume up to hear the level that
you are used to hearing.
• Eventually you will hear 'crackling' 'popping' sounds, often accompanied by:
• 'Swelling' volume levels.
• Buzzing.
Preamp Tubes:
• Hissing, 'shooshing'.
• Sputtering, 'grumbling'.
• Microphonic squealing (feedback type sound).
• Loss in signal in one or more modes of the amp (channel, reverb, fx-loop).
WARRANTY: IMPORTANT NOTE -
This can be pretty techy stuff and we do not recommend changing your valves yourself if you are new or inexperienced. You are advised to take your amp to a recognised Mesa Boogie main dealer (like us) or experienced amp technician for advice. These tubes are "consummable" items and therefore have only a 30 day warranty. In the event of a warranty claim please return the valves to us with your original receipt and we will return the valves to Mesa Boogie for testing before replacements are despatched. Some valve failure is caused by faulty amplifier circuits therefore not covered under the warranty. (It's a bit like having bad wheel alignment and complaining that your brand new tyre has worn unevenly around the edge)
However we are an official Mesa / Boogie main dealer so buy in complete confidence that these are 100% official, original and new Mesa / Boogie valves.
Any questions just email or call us on 01202 718886.
Why is this an "Immediate Payment Required" sale ? We use this feature to prevent other shops / time wasters / newbies making false or accidental purchases from us. Some ebayers (you know who you are ) hit the 'buy it now' button and not follow through with the payment just so that our item is taken off the ebay marketplace in order to sell their own one. Yes, sadly it happens.
What if I don't have Paypal? NO PROBLEM - anyone with a credit or debit card can use paypal but if you are not sure then feel free to give us a call on 01202 718886.
Guitar Mania EBAY insider info....
Watch out for:
Ebayers who offer delivery in 7-10 days = it's not in stock ! Once they have your money who knows when you'll get ? --- It's in stock here at Guitar Mania, right now. Order before 1:00pm and you'll get it next working day, usually (see feedback).
Ebayers who don't specify UK stock = possible EURO mains lead / no warranty etc - - - - - We only sell 100% pukka UK stock.
Ebayers who don't specify brand new items = could mean used or ex demo etc - - Ours are 100% BRAND NEW !
GOLDEN RULE - don't assume anything !
Shipping:
UK Postage, packing and delivery is via the post office 1st class recorded delivery and costs £2.95
Rep of Ireland / Eire:
Please email for a quote.
Channel Isles and any other non mainland UK address:
Please email for a quote.
Despatch schedule:
Orders placed Monday to Thursday before 1:00pm, goods should arrive with you the following day (or as specified above)
Orders placed Friday before 1:00pm should arrive with you Monday (ditto)
Orders placed Friday after 1:00pm, Saturday or Sunday should arrive with you on Tuesday (or as specified above)
Please make allowances for Christmas, Bank Holidays, hideous weather, plague of frogs etc etc
Europe:
Postage will cost £17,00
Payment:
Credit / Debit / Switch cards: Just phone our Ebay hotline 01202 718886 lines open 9:30am to 5:30pm, Monday to Saturday.
Paypal - Accepted only for CONFIRMED UK addresses only. Phone 01202 718886 for details.
Cheques - please make payable to Guitar Mania Ltd and allow a minimum of two weeks to bank and clear.