Grant Lumley GL50A

Best valves for Grant Lumley GL50A amplifiers

The Grant Lumley GL50A amplifier uses:

4 x ECC82 pre-amp valves (also known as 12AU7).
4 x KT77 matched power valves.

The needs of the Hi-Fi enthusiast are often very different from the needs of the guitar amplifier enthusiast. This is reflected in the valves we recommend to ensure you get the very best tone and performance.

We recommend JJ valves for this amplifier. This is because they guarantee you get an awesome tone and long life and they don’t cost a fortune.

Order your valves today and hear the difference

So restore the tone, the performance and the sparkle to your amplifier. Treat yourself to a brand new set of valves today.

All of our hi-fi valve kits are carefully selected, graded and fully tested.
A significant upgrade in valve quality compared with stock valves.
We offer a variety of shipping options with full tracking and insurance so you can order with confidence.
We have 30 years of experience so you know you are in safe hands.
International shipping – we post all over the world every single day.

Replace the valves on your Grant Lumley GL50A

If you have any queries about replacing your valves please get in touch. We have over 30 years of experience so one of our team will always be happy to help and advise.

If you want to know what your shipping options are, simply add the product to the basket and when you get to the checkout it will show you delivery costs, options and delivery times.

About the amp

Effective power: 50W + 50W (8 Ω)

Output bandwidth: 20 Hz to 25 kHz

Input sensitivity: 1.0V

Input impedance: 100k Ω

Signal-to-noise ratio: 78 dB or more

Power: 110 VAC, 50Hz/60Hz

External dimensions: Width 484mm, Height 200mm, Depth 258 mm

Weight: 16.5kg

Tubes for sale for Grant Lumley GL50A amplifiers

Order your new tubes today and get your amplifier sounding better than ever.

Simply choose the complete replacement valve kit or the seperate valves for your amplifier below:

Showing the single result

KT77 Valve JJ Matched Quad TESTED NEW

£137.38

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Why buy your new valves from Ampvalves?

Amazing Quality - All our valves have been tested to the highest possible standard using the best testing equipment on the market.
100% Guarantee - All of our valves are fully guaranteed for complete peace of mind.
Soak Testing - All of our valves are soak-tested for 30 minutes to reduce failures after fitting.
Rated 5 Stars on Trustpilot
Awesome Tone - You'll hear the difference. A new set of tubes will get your amp sounding and performing like new.
Stunning Price - Our individual Valves and complete Amp Kits are competitively priced to ensure you get great value.
Superb Customer Service - We are always at the end of the phone to answer any questions you may have. We are all guitarists here and treat every customer as we would like to be treated.

      EXCELLENT  
   Based on 23 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Stuart ukguitarampguy 
 
 
 
 Trustindex verifies that the original source of the review is Google. I'm a Berkshire based amp tech and have fitted literally hundreds of valves sold by Ampvalves. Always reliable and I get a personal servivce too if I have any queries. Very good company in my view.
  
 
      Posted on Google  
   
   Isabelle Worthington 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service , friendly and helpful very knowledgeable. Thank you so much amp now working as it should.
  
 
      Posted on Google  
   
   Anthony White 
 
 
 
 Trustindex verifies that the original source of the review is Google. Absolutely brilliant service from Ampvalves.co.uk
I will not hesitate to use this excellent company again.
Easy website to navigate, with valves arriving well packaged and on time.
Ampvalves provide a service I've not experienced for years. Try them. You wont be disappointed.
  
 
      Posted on Google  
   
   Steve 
 
 
 
 Trustindex verifies that the original source of the review is Google. New valves arrived today from Ampvalves. Awesome. I loved the sound of my Victory V40 when I bought it new - and now it's even better. Great valves and superb customer service. Highly recommended.
  
 
      Posted on Google  
   
   Alex Fischer 
 
 
 
 Trustindex verifies that the original source of the review is Google. I recently purchased a replacement tube set for my Line 6 DT25 Head amp from Ampvalves.
The website is very user-friendly and makes it easy to find the perfect tube set for your amp.

Due to an error by the parcel service, my shipment did not find its way to me. After contacting the support, I was helped immediately and competently.

The quality of service was truly exceptional and exceeded my expectations. A special thanks to Barry Tyler. Hey Barry, you did a very good job.

The tube set arrived afterwards in excellent condition, exactly as described on the website.

The quality is remarkable. It’s well worth the money for their high-quality tubes. I highly recommend the tubes from Ampvalves.
Also, my amp gives grateful feedback with a wonderful fresh sound.

Alex from Switzerland
  
 
      Posted on Google  
   
   Max Bevan 
 
 
 
 Trustindex verifies that the original source of the review is Google. Will never buy valves anywhere else. Incredibly well set up website to find the correct tubes. Very well priced and very quick delivery. Will be recommending to everyone! Thank you!
  
 
      Posted on Google  
   
   David Dawkins 
 
 
 
 Trustindex verifies that the original source of the review is Google. Amazingly helpful, truly above and beyond with their customer experience. I was pretty stuck, through my own fault, and still they went the extra mile to get me back up and running. Thank you so much.
  
 
      Posted on Google  
   
   kev herbert 
 
 
 
 Trustindex verifies that the original source of the review is Google. Cant fault them extremely helpful & prompt with delivery.
  
 
      Posted on Google  
   
   Steven Wilson 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent place to grab your amp valves. Great choice of valves, amazing customer service and prompt responses to queries via email. I was unsure of the best valves to use for my amp and sound, they gave me great advice. When I ordered the valves I used the wrong delivery option and they even sorted that out for me. Highly recommended.
  
 
  
  
 
    Verified by Trustindex  Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more