Twin Reverb Retube Set


6L6GC (x4): NOS RCA Black Plates
12AX7 (x4): RCA 12AX7 (Long)

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Customize your Twin Reverb (or clone) the way you want it with our collection of new old stock USA tubes!

RCA 12AX7A are typically the go to 12AX7 option for Twin Reverbs.

For best cleans use short plates. 

For best of both worlds use long plates.

All sets include:

2 - Free RCA 12AT7

4 - 6L6GC

4 - 12AX7



Stock tube sets for vintage Fender amps and their clones. 

All sets come with one RCA: 12AX7, 6V6, and 5Y3GT

Customizable options available:



What are the best tubes for Fender Amps? 

They have been behind countless classic tracks and dominated the market with their versatile range of electric guitar tones. From smooth jazz to hard rock, Fender amplifiers are always a sure bet for awesome guitar tone.

Yet wait, you know all this. You are reading this because you are already in love your Fender amp, you take it everywhere and you want it to perform to its absolute best.

Here is Fuzz Audio’s list (by era) of vintage valves that will help you get that extra 10% of warm tube goodness of out your Fender tone machine.

RCA is King, GE is Queen

When it comes to vintage Fender amps and really any classic USA guitar circuit, RCA is always the first brand that should come to mind. This is because for any given Fender amp made prior to 1965 there is an 80+% chance your amp originally came stock with RCA tubes.

Because Fender relied heavily on the use of RCA tubes up until about 1965, they should always be considered when upgrading tubes in a Fender amp or restoring an amp back to original condition.

However, that being said, other USA manufactures should not be overlooked.

Remember how we said, “80+% chance your amp originally came stock with RCA tubes?” Well, the other 15-20% would be found with GE tubes. GE 12AX7s in particular are a great budget valve to get your amp running optimally without burning a hole in your wallet.

The Best Tubes for Fender Amps by Era

Tweed Era (1948-1960) 

Single speaker tweed amps deserve long plate preamp tubes. If you play with lots of distortion, fuzz or like lots of warmth; black plates are by far the best tubes for tweed Fender amps.

Stock tubes for early tweed Fender amps:

RCA Black Plate Pre Amp Tubes
RCA 6V6GT (Smoked)

Our optimal Tweed Champ set:

Black Plate 12AX7
RCA 6V6GT (smoked)
RCA or Tung-Sol 5Y3GT

Back and Brownface Era (1960-1967) 

As amps started to get bigger, tube plates became smaller to compensate for “noise floor” with the larger Fender amps of the 60’s.

If you have a blackface amp with one speaker, long plate preamp tubes are still the way to go.

On the other hand, if your amp has more than one speaker, and you want your amplifier to be quiet, you may want to look at tubes like the 12AX7A or 7025. Both RCA and GE have great versions of these tubes. For power tubes, hands down best performers are RCA black plates.

Stock tubes for Blackface Fender amps:

RCA/GE 12AX7A/7025 (Grey Short Plates)
RCA/GE 12AT7 (Grey Plate)
RCA Black Plate 6L6GC
RCA 6V6GTA (Grey Plate)

Our optimal Blackface Twin Reverb set:

4 RCA 7025
2 RCA 12AT7 Black Plate
4 RCA Black Plate 6L6GC

Silverface to Modern Era (1967 - Present) 

Early Silverface amps would have been found with the last batches of the classic RCA tubes of the Blackface Era. Yet by 1970 the glory days of RCA were over, and we see Fender start to plug in Sylvania/Philips Preamp tubes, along with GE pre and power tubes. These tubes are typically branded “Fender” and sound less warm than earlier versions.

Thus, in our opinion the best vacuum tubes for Fender amps were made pre 1970, and because of this, we are left with the options already mentioned if you are chasing legendary tone.

If you are trying to return your Silverface amp back to 100% stock components you would have several options, as Fender was inconsistent with the tubes they used in this era.

Stock tubes for early Silverface (1967-70):

RCA/GE 12AX7A or 7025

Stock tubes for post 1970 Silverface:

Sylvania/Philips (USA) Preamp Tubes (Sometimes Fender Branded)
GE 12AX7A (Fender Branded)
Power tubes: USA or even JAPANESE





At Fuzz Audio, all vintage/NOS vacuum tubes purchased through our website are guaranteed for one year from purchase date. We accept returns for tubes going noisy, losing output/performance prematurely, and of course losing function all together.  (Read about power tubes below). 

We will not cover damage from red plating neglect, glass breakage of any kind, loose bases, or other obvious faults that are due to neglect, rough handling or egregious constant use. 

This policy is meant to protect the buyer from having a tube go out on them prematurely from a flaw we missed. Tubes, especially preamp tubes, should last half a lifetime, and well beyond a year, so we want to guarantee each customer that you get a tube that will last.

For power tubes, although we will honor any faults mentioned above, we will not accept a return for a power tube that has obviously been used for 6+ hours a day for every day of the year for one year. Power tubes that have clearly been used beyond their normal wear point will not be accepted. 

If you suspect one of your vintage Fuzz Audio tubes has gone bad within one year of purchasing, simply reach out via our chat or at and we will assist you in the warranty exchange process. No receipt is needed.

Please note, it is possible we will be out of stock of the tube that is in need of a swap. If this is the case, we will either offer a refund, credit, different tube, or send the first available tube of that type when it comes back in stock. 

If you have any questions or concerns, please reach out!

At Fuzz Audio:

  • We match all tubes for free!
  • All vintage tubes are guaranteed for one year.
  • All tubes are tested on a calibrated Hickok 539C, Amplitrex, Maxi-Matcher, or other industry standard tube analyzers.
  • Preamp tubes are matched by gain and mutual conductance (Gm)
  • Power tubes matched by mA and Gm
  • All tubes tested for microphonics and are guaranteed to work in your application.
  • If you require SUPER LOW noise tubes, please reach out. We will most likely meet your requirements for free.
  • Do not hesitate to reach out if you have any questions or concerns, we are here for you.

We guarantee NOS test scores, clean pins, tight matches, and ultimately that they work in your application or YOUR MONEY BACK!

Tubes in photos represent the tube you will receive. Getter construction or logo may differ. Logo may be partially missing or cleaned off. You may or may not receive a box. Tube type, manufacture, and NOS test quality will NOT change. If logos and original boxes are a deal breaker- please reach out before purchase we are always happy to accommodate.

Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. 

To be eligible for a return, your item must be in the same condition that you received it. It must also be in the original packaging. 

 Non-returnable items:  
- Downloadable software products 

To complete your return, we require a receipt or proof of purchase. 
Please do not send your purchase back to the manufacturer. 

There are certain situations where only partial refunds are granted (if applicable) 
- Book with obvious signs of use 
- CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened 
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error  

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund. 
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days. 

Late or missing refunds 
If you haven’t received a refund yet, first check your bank account again. 
Then contact your credit card company, it may take some time before your refund is officially posted. 
Next contact your bank. There is often some processing time before a refund is posted. 
If you’ve done all of this and you still have not received your refund yet, please contact us at

We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at and send your item to: 24288 E Roxbury Cir. Aurora CO, 80016

To return your product, you should mail your product to: 24288 E Roxbury Cir. Aurora CO, 80016

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. 

Depending on where you live, the time it may take for your exchanged product to reach you, may vary. 

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

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