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Best valves for Supro Thunderbolt S6420 amplifier

Supro Thunderbolt S6420

Best valves for Supro Thunderbolt S6420 amplifiers

The Supro Thunderbolt S6420 amplifier uses:

  • 1 x ECC83 preamp valve (also called 12AX7).
  • 1 x Balanced ECC83 for the phase inverter (in position V2).
  • 2 x 5881/6L6GC matched power valves/power tubes.
  • 1 x 5U4GB rectifier valve.

Note: The balanced ECC83 goes in the V2 position which is the preamp valve sitting next to the two power valves.

A brand new set of valves will get your amp sounding better than ever.

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

Remember, JJ is one of only five manufacturers of valves in the world. So don’t pay higher prices for valves from the same factory that have simply been rebranded by other companies.

Order your valves below and hear the difference

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

  • All of our valve kits are carefully selected, fully tested and digitally matched.
  • 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 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 Supro Thunderbolt S6420 amplifier

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.

Also, we recommend that you take a look at our FAQ section where we answer the most popular questions we get asked each week. You will also find lots of useful tips if you are new to upgrading your tubes.

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

About the amp

This is the 50th Anniversary reissue of the original 1964 Supro Thunderbolt.

One of the preamp valves is tucked away on this amp and not immediately obvious. You can download a copy of the Supro S6420 Thunderbolt User Manual here.

tube layout on supro thunderbolt s6420
Tube layout on Supro Thunderbolt S6420

Tubes for sale for Supro Thunderbolt S6420 amplifier

Order yours today and get your amp sounding better than ever.