admin – Premium Vacuum Tubes

Shipping from US Warehouse now available!

With the complicated US customs clearance with carriers and anticipated processing backlogs in the upcoming holiday shopping season (from November to January), we have pre-stocked some of our ‘best seller’ tubes to a partner fulfillment warehouse in Michigan, USA, to offer our US customers more predictable delivery time.

At this time (Oct 2025), the following models are in stock ready to ship from MI, USA:

6SN7 Top 10% Best Grade pairs (including Linlai™ Global Elite E-6SN7 & our best special edition GF-Select 6SN7-SE)

300B Top 10% Best Grade pairs (including Linlai™ Global Elite E-300B flagship tubes)

845 Top 10% Best Grade pairs (including Linlai™ Global Elite E-845 flagship tubes & highly cost effective 845-T2BE Black Bottle tubes)

Hurry up to get your orders in before the pre-stock runs out. (note: Shipping cost quoted in the shopping cart will not change when placing an order. ‘Shipping from US warehouse’ will simply shorten transit time from order placed to order delivered, but all actual shipping from us to buyer and duty costs do not change, as they still incur no matter what.)

We will replenish the stock in the US from time to time. If pre-stock runs out, your order will be reverted to be shipped from Canada with duty tax paid as usual.

Share your 90-day plan and help us to plan inventory ahead: If your intend-to-purchase stock is currently not available in the Michigan warehouse, please submit an ‘Expression of Intention to Purchase’ in this form for us to better predict future inventory needs from the USA. (Please note this is not a purchase commitment from you, nor a guarantee of stock from us – it is solely for information purpose and logistics planning.)

US Tariff & Shipping Guide

This post will be updated frequently with US tariff policies changes.

All US destination orders are now shipped with tariff prepaid by us to expedite and simplify order shipping.

US receivers will NOT receive a surprise bill at the time of delivery.

All actual tariff related charges paid to US Customs by us via couriers, including associated fees on top of the tariff itself, are 100% non-refundable. US Customs do not accept any tariff / duty claw back under any circumstances, even if an order is later on returned for ANY reason at ANY time. This is the policy by US Customs and there is no exception.

For the coming holiday shopping season:

Our STRONGEST advice is to shop EARLY and get your order in BEFORE November 1ST. Peak season has VERY HIGH shipping damage due to unavoidable rough handling with ALL COURIERS. We may restrict outbound shipping during that time to control losses by shipping damages.

Thank you for working with us through this Tariff time!

Grant Fidelity

Ship to Europe: Get 50% tax bill rebate

European countries will request all imports of any amount to be subject to VAT / duty assessment by local authorities.

Post office & couriers in Europe will calculate duty at the time of parcel import based on the value of shipment, and collect it from the receiver at the time of delivery.

By filling in your tax ID on checkout page of your order, it will expedite order processing through customs in Europe. We do not sell data to any marketing agency – this tax ID is only used to create shipping documents to expedite your order customs clearance with your country’s authority.

As each European countries have different VAT rates and/or duty regulations / customs processing fees, we do not include VAT or duty amount in our website pricing.

Most western European countries have digital customs processing which is fast and efficient – receiver usually gets either SMS text messaging or email notification when VAT/Duty amount is due for payment before a parcel can be released. Please be sure to check your email and/or track the parcel with provided tracking number – you usually can pay for the VAT/Duty bill online before the parcel reaches your local courier depot.

We can rebate 50% of your import charges:

We now offer to refund 50% of your European import charges (combination of import fees, VAT and duty) up to either 50% of the import charge bill, or 50% of the amount of your country’s VAT, whichever is LESS.

Example 1:

If your country’s VAT rate is 20%, your order item total price (net of insurance and shipping etc) is 500 Euro and you received an import charges bill for the amount of 85 Euro. We will refund you the less of: 1) 50% of import charge bill = 85 Euro X 50% = 42.50 Euro, or 2) 50% of VAT of the item price = 500 Euro X 20% VAT X 50% split = 50 Euro. Your final refund from us will be 42.50 Euro.

Example 2:

If your country’s VAT rate is 25%, your order item total price (net of insurance and shipping etc) is 1000 Euro. You received an import charges bill for the amount of 320 Euro. We will refund you the less of: 1) 50% of import charge bill = 320 Euro X 50% = 160 Euro, or 2) 50% VAT of the item price = 1000 Euro X 25% X 50% split = 125 Euro. Your final refund from us will be 125 Euro.

How to claim 50% import charges rebate:

This 50% split rebate will only be issued as refund to your original order payment method, upon presenting the official import charge bill issued by your country’s customs, and subject to verification.

The bill can be sent to us as scanned .pdf file or .jpg image and can NOT shown being altered by any means. We do not accept emailed message of ‘I was charged for and paid this and that amount’ or a portion of your credit card bill. It must be the official tax bill from courier or your country’s customs authority, showing the shipment tracking number to match with your order.

Once you have claimed the 50% split rebate, your order is no longer qualified for refund under any circumstances and any amount rebate issued will be sunk cost. Please understand the amount paid to a country’s customs and tax authorities cannot be clawed back by us under ANY circumstance.

We hope the above rebate policy will make international shopping less expensive for our European customers!

Linlai Global E-845 vs. Psvane ACME 845: ‘almost immediately sense the superiority of the Elites’

Received from customer James H. via email:

“When looking for a review of the Linlai Elite E-845, I could not find anyone who was able to compare it to the Psvane Acme 845, which is the tube’s nearest competitor….

I have the Line Magnetic 845 Premium which uses a pair of 845’s & 300B’s. I will say that the Linlai (Global) Elite E-845s have taken a very long time to sound good for me. It took about 75 hours for me to begin to like them. I do like them quite a bit now after about 100 hours.

I also have a pair of Psvane Acme 845s… which will be up for sale very soon. I did not really have to A/B the Acme’s with the Elite’s to almost immediately sense the superiority of the Elites. The Acme’s were veiled, cloudy, dark, reticent, and very much stuck in the speaker box compared to the Linlai Elite E-845s which have the opposite traits. The Linlai Elite E-845s are just in an altogether different league than the Psvane Acme 845s.

Frequent Order Tracking Questions – Read before email

Here are answers to the frequently asked order tracking questions – please read it before using ‘contact us’ form to send email. It may have answered your question and save you time to write emails!

Order placed – when will the order be shipped?

Answer: Typically within 48 hours (2 business days, excluding weekends and holidays that our business location – Alberta, Canada, observes locally). If for some reason your order cannot be shipped within that time frame, you will receive an email from us with details.

2. Can you send me tracking number once order is shipped？

Answer: All order shipping updates are done automatically to our online webstore order system. Please use your email (the one you used to place order) to login your account to see most up-to-date updates. If you didn’t register an account at the time of order, you can register it now with your same email. The website will send you a password automatically for you to login. You can change the default password if you wish after you login.

3. Why I didn’t receive the account login credentials email or any order updates?

Answer: The most common reasons are – Reason #1: you might have a typo in your email address when you register your account so the emails cannot be delivered. Simply register a new account with your correct email again. Reason #2: your email server blocked our email as spam. It is common these days that email server blocks out automatic emails. Please add grantfidelity at gmail dot com in your email contact list and mark us as a ‘safe sender’. Reason #3: For those using gmail, automatic emails are often routed to sub-folders in your inbox or Spam folder – Inbox subfolders are called ‘Promotions’ or ‘Social’ or ‘Updates’. You can find those Gmail inbox tabs in horizontal in your gmail inbox top header. Be sure to check your spam folder too, and add us to your safe sender contact list.

Treasure 6SN7SE Globe: ‘I got the chills from this thing’

Feedback received from customer Noah via email:

“Hey there, I just received a Treasure Globe 6SN7-SE

I dropped it in my (Schiit) LYR+ / BIFROST and I’ve been listening to it on my (Sennheiser) HD800S. This thing is mind blowing – thanks for selling such a great tube in Canada.

I got the chills from this thing. It completely evens out the tone of these headphones while still keeping a massive soundstage. I have been using them for every genre and it all sounds good, as long as it was mastered well. I’m going to have to get more spares . . . “

Push pull amplifier – tube troubleshooting

Below are procedures that customer needs to complete to identify faulty tube, before submitting a warranty request:

For Push Pull tube amps – 2 power tubes (either EL34 or KT88 – these are the most commonly used power tubes in push pull amps are used per channel. You may also see 2*300B or 2*845 type power tubes in recent years’ design) Total 4 tubes are used for two channels together.
If your amp is making abnormal noise such as loud static noises or obvious humming etc, you need to identify exactly which channel (left or right) have problem, and exactly which tube is causing the problem.
As amplifiers are of stereo channel – i.e. 2 channels symmetrically, a simple way to identify a faulty tube is ‘divide, swap and confirm’.
Split 4 tubes to 2 groups first, then only install 2 tubes (Group #1) in left channel and use your two previous known good tubes in the right channel. Turn on the amp and see if problem presents in left channel that you installed the new tubes (Group #1) . If No, go to step 6. If Yes, go to step 5.
Split the 2 tubes and install one in EACH channel (in two symmetric sockets in left and right channel), and split your two previous known good tubes in the other two symmetric sockets in left and right channel. (Do not worry about ‘blending’ your new tube and previous tube in one channel in this troubleshooting process.) Identify which channel (left or right) presents problem – the tube in the problematic channel is the faulty tube.
Since you didn’t find problem in step 4 with 2 tubes (Group #1), now use your other 2 tubes (Group #2) and repeat the same process in Step 4. The tube in the problematic channel is the faulty tube.
If you found more than one tube is of problem in the troubleshooting process, identify EACH tube’s problem and describe THE PROBLEM SEPARATELY on a piece of paper, along with that tube’s serial number (if the tube has a serial number on the base, or on the metal tag inside the tube).
Now take a CLEAR & HIGH RESOLUTION picture of the tube and the paper (showing the problem message you have written down) together. You need to submit this picture when contacting us to file for factory warranty claim.
Wrap this piece of paper containing the information to the corresponding tube and attach it with an elastic ribbon and have it ready for shipping. DO NOT USE ANY MARKER TO WRITE ON THE TUBE ITSELF.
Contact us via email to file factory warranty claim – Please provide ALL information you feel pertinent about the tube problem, including but not limited to: your amp make and model, describe the event of tube problem you have experienced, and if using an entirely different set of tubes resolved ALL problems. If problems still exist when using other tubes – chances are that your amp might need a check-up by amplifier service technician before you use a new set of tubes again in the amp. A problematic amplifier can damage a perfectly fine set of tubes, and this will not be covered by tube factory’s warranty.
Once your email is received by us, we will reply you within 48 hours about warranty return shipping instruction. There is NO NEED to ship known good tubes back to us – extra shipping and handling can easily damage fragile but perfectly good tubes. Only ship known faulty tube for warranty process, unless we instruct otherwise.

We appreciate you take the time to isolate the problem. Refusing to conduct the troubleshooting process will not move your warranty process forward – not all tube problem can be reproduced in the lab testing equipment, if it is intermittent only. We need customers to work with us to quickly have your tube problem resolved under factory’s tube warranty policy. It is a team work between buyer and seller.

Thank you.

Grant Fidelity

‘Treasure 6SN7-SE GF Special Edition’ – ‘better than ANY tubes I have ever used!’

Treasure Globe 6SN7-SE (pair or single, GF Limited Special Edition)

Mark S. acquired a pair of Grant Fidelity special edition Treasure 6SN7SE top grade with us recently for his Moon Audio Dragon Inspire IHA-1 Tube Headphone Amp. Below is his feedback via email. We hope this will help other headphone amp owners when choosing upgrade 6SN7 tubes!

“Rachel,

Bless your heart! My order of the Globe 6SN7 tubes arrived in just 3 days! _{(seller note: Mark ordered our Express shipping upgrade for extra cost)}

I realize that there is a break in period for the tubes, but they are already better than ANY tubes I have ever used!

For the first time, my amp has ZERO noise with headphones! I can’t believe it. Also, I have never heard the sound so incredible as it sounds with these tubes!

Thank you so much for your great service and the best tubes I have ever heard!

Very best regards,

Mark”

A floating piece of glass inside the tube – What is it?

If you have been playing with vacuum tubes long enough, you might have run into a situation that a new tube, shipped from a vendor, arrived with a piece of floating glass inside (see reference picture below). What is it? Where does it come from? Is the tube damaged beyond useful?

Here is the answer:

This piece of floating glass is a broken-off piece from the tube filament glass stem. See picture below showing where it is exactly broken off from.

2. This broken piece is often resulted from the heavy filament structure in vibrating motion during shipping and handling. However, since the tube glass stem is a wide structure supporting the full filament structure – a small piece

broken off from the tip won’t hurt the tube structure’s integrity at all.

3. We see this ‘floating glass’ from TJ Full Music 300B tubes, but not much from other Chinese brand such as Shuguang 300B tubes produced in southern China. Our guess is that the glass supplier for Full Music (located in Northern China) is likely different and glass production technique isn’t exactly the same.

4. This piece of floating glass won’t affect tube function at all and won’t interfere with the vacuum capacity inside the tube. Glass is non-conductive. User only needs to stand the tube up, let the floating piece to fall to the bottom of the tube enclosure, plug the tube into socket vertically, then it is all done!

Customer feedback on GF Premium Tubes:

Here is an email feedback we received from customer Thomas L about his personal experience of buying from Chinese vendors vs. Grant Fidelity:

“Hi Rachel,

Just thought I’d give you a little feedback with my recent purchase.

Your tubes are expensive (adding in all the fees and shipping). I think you would agree as well, although you may argue nothing is cheap with this Audiophile hobby, which I would agree as well. With my recent purchases, I think it was pushing around $2000 CAD. This was for 5 845s, and two pairs of 300Bs. Honestly, I had been looking at the GF tubes for a while now, never had the $$ or the guts to pull the trigger as the number of tubes that I need for my amps in total would put a dent in my bank account. With the boxing day / black friday sales, I figured it would be a good time or timing to replace my existing OEM tubes. So …. Here’s what I have learned.

Prior to this purchase, I had been buying tubes online from China or locally from a friend. But what did I get exactly?
* Noisy tubes.

* Tubes that broke after a listening session.

* Tubes that looked like they were shorting out (they were supposed to be new!!!!).

Then I had to contact my friend or vendor in China to have the tube(s) replaced. And on one occasion I had to pay duty for the replacement tube.

So, after I plugged the GF tubes in my amp(s), I had a moment where I was thinking, “this is what I get for paying a premium price.”

The tubes are quiet, like very quiet. The difference between OEM vs the GF tube is obvious. I used to think that my amps were noisy, but only after I plugged in the GF tubes, I realized a good amount of noise was actually from the tubes itself.

Balanced sound stage. I am referring to the left and right channels. With that comes a solid image. You have vocals that comes directly to you. I’m particularly picky when it comes to this as I hate to hear vocal lop-sided.

Last but not least, sound quality. Smooth, very Smooth but not losing both top and bottom end.

Overall was it worth it? The decision is leaning to a Yes. With the tube and sound quality accounted for. And most importantly, this is a case where I plugin, dial in and enjoy the music without having to worry too much about reliability (knock on wood, so far so good).

Lastly, great service. Thanks again for the quality products and super fast shipping.

(Now, I will have to save up again for the next tube upgrades).