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12AX7A-C / ECC83 TAD Premium Selected

From €29.50 *

*Prices incl. VAT plus shipping costs

This item is no longer available

Premium Matching:

TAD 12AX7/ECC83 REDBASE Premium Selected
€29.80 *

In Stock, delivery time approx.1-4 working days (Within Germany)
     The delivery times for shipping abroad can be found here.

Part Number: RT-12AX7
  • RT001
  • 2.5x2.5x8 cm
  • 0.02 kg
  • 4251594900009
Perfect V2+ Preamp Tube - Good Gain - Tight Deep Bass - Fat Mid-range!!   The TAD... more
Product information "12AX7A-C / ECC83 TAD Premium Selected"
Perfect V2+ Preamp Tube - Good Gain - Tight Deep Bass - Fat Mid-range!!
The TAD 12AX7A-C / ECC83 TAD Premium Selected provides very good gain, tight deep bass, fat mids and silky top end with overall definition and brightness.
Selected with balanced systems and recommended for guitar amps to improve overall response.
Best for clean tones as well as for sounds requiring deep-bass power like any modern preamp.
Recommended for all positions in amps with medium gain level or High-Gain Amps for V2+ positions.
As for V1 in general, but especially for higher gain amps or phono/audio-amps, we recommend the RT010 7025 Highgrade, the RT030 E83CC/7025 Highgrade or RT093-HG 7025-WB Highgrade
The TAD 12AX7A-C can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, ECC83 or E83CC.
1st choice for:
Blackstar®, Boogie®, Diezel®, Engl®, Fender®, Hughes & Kettner®, Koch®, Laney®, Marshall®, REVV®, Soldano®, Two Rock®, VOX® and so many more.


Q: When does a preamp tube become a Premium Selected tube?
A: All preamp tubes labeled Premium Selected have passed the following tests:
-      Low Noise Test
-      Microphonic Test
-      Gain Test
-      Sonic Tests
-      Shock Tests
-      Listening Tests
-      Balanced Output Test
Premium Selected
We call the tubes SELECTED which have passed above tests and thus qualify as reliable all-round tubes of their type.Typically this is around 30-60% from a batch that receives the SELECTED label from TAD.
For applications in particularly sensitive functions such as V1 or input stage with combo amps, V1 in high-gain amps, tube microphones and phono preamps, we recommend using the respective HIGHGRADE selection
Matching and Selecting Options for Preamp Tubes
Matching in Pairs for preamp tubes means that two tubes show identical gain, hence, four characteristically identical systems.
This matching method includes our Balance-Selection. We highly recommend this matching method for hi-fi systems.
TAD Premium Selected/Highgrade tubes are guaranteed for a period of 6 months (according to terms of warranties)
for the quality criteria mentioned above.
Tube Type: 12AX7/ECC83/7025
Socket: 9 Pin(Noval)
Selection: Premium
Read, write and discuss reviews... more
Customer evaluation for "12AX7A-C / ECC83 TAD Premium Selected"
28 Jan 2022

Sublime in Croft Integrated

Replaced standard JJ ECC83S and these are a revelation. Really quiet, with a dark background from which instruments appear. The soundstage is amazing, with sounds that I have never heard being placed around the room. More treble and attack than the tube sounding JJs, with better instrument placement. Stringed instruments are very realistic. Comparing with the JJ 903s GP at the same time, and these are better if you like strings and clarity in the presentation.

15 Nov 2011

I play really overdriven Sabbath/Clutch style hard rock, so a lot of single string riffs and barre chords. My amp is a Laney Lionheart L20T-410.

My amp came stock with this TAD 12AX7 tube in the V2 position, and V1/V3 had TAD 7025/ECC83 Premiums. It sounded great, but I wanted to try matching V1 and V2 with the same 12AX7's, so I bought another one of these. It definitely gave it more gain, but the top end became fizzy and lost a lot of definition and smoothness. So I switched V1 back to the 7025/ECC83. I'm now going to buy another 7025/ECC83 for V2.

I do not recommend this tube, at least for my amp. It really loses smoothness and definition to chords.

TAD: Your amp is designed and tuned to a balanced tone which is achieve by the blend of the rather smooth TAD 7025/E83CC tubes in V1 and the more bright RT001 in 2nd stage. Changing V1 to the more bright RT001 obviously isn't what you were looking for. Following your playing style I'd recommend the RT080 7025WA, the RT011 7025S or the stock RT030 7025/E83CC.

27 Oct 2009

Here at Sarno Music Solutions, we manufacture high end vacuum tube preamps and buffers for pedal steel players as well as for other instruments. For the past few years we've really struggled finding a good and reliable 12AX7 and 12AU7. Not only was it proving to be hard to find a good sounding tube, but it was hard to find a reliable and low-microphonic tube. Also, some of our circuits have "cathode followers" in them, and those require that a tube have the proper voltage spec to avoid failure. Many new tubes don't adhere to this critical spec. The TAD preamp tubes are proving to be the answer we were looking for. Not only is the sound superior and ideal for what we do here, but the noise, microphonics, and reliability issues were all beautifully addressed with these tubes.

Thanks TAD!

Brad Sarno

Owner, Sarno Music Solutions

25 Aug 2008

I have fitted three of these to my Laney LC15R dont think 15 watts is enough to play live I run this through th matching Laney cabinet with 2 x 10" speaker's with the new valves from TAD ,it is so clean now.

Thank you very much for the prompt service and delivery..

I Will not hesitate to recommend you to friends and fellow musicians.

Paul Chuter. UK August 2008:

6 Sep 2006

I play classic hard-rock music, close to Black Sabbath from the 80'-90’ and Dio. I use Marshall 6100 LM Anniversary Series, Marshall 1960 AV cab and Gibson Les Paul Custom equipped with Seymour Duncan SH-4 & Alnico II Pro pickups or Fender Stratocaster USA CBS 1978 HSS (alder body and maple neck, no rosewood) equipped with Bill Lawrence L500XL & two L250 pickups.

For a preamp I used to use Marshall ECC83, changed for a while into Groove Tubes GT-ECC83-S. The problem with the GT's - too much gain. It's OK when desired, but I'm looking for more classic and round tone. So I've sold GT's and returned to Marshalls. They did a great job and I wanted similarly sounding tubes for a preamp. In my previous amp - Marshall JCM2000 DSL 100 - I've also tried Sovtek's and JJ's, but I definitely do not like the sound of those. Nothing but scratchy highs, no bottom... TAD’s are very well-balanced, harmonically rich and melodious.

The TAD guys advised me 12AX7-C for the tubes V1 & V3-V7 and HIGHRADE 7025 for the first gain stage tube - V2. And I must say - that's what I was looking for. Even if you know that these are Chinese. I was really impressed of what they did to my tone. The Clean channel is warm and round, very punchy indeed. Crunch channel is transparent and there're so many possibilities of tone shaping. You can adjust short crunch or even suitable tone to play transparent riffs. The Lead channel is killer with those tubes, really fat, round, gluey, creamy, but not screamy. Guitar sings at the solos, but you can also play shredding leads, very selective and full.

So – if you are looking for a balanced round tone with a bit of vintage – these tubes are for you. I think it’s possible to get “metal” sound also. Tone of TAD tubes is very versatile, so keep experimenting to achieve what you desire most. These tubes will give you many possibilities of creating your personal tone.

As for the power tubes the TAD guys advised me a quad of TAD 6L6GC-STR. My amp sounds perfect now - read my review. If necessary write me at

6 Oct 2005

When I ordered new tubes for my Laney LC30mkII I was very impressed with the better quality tubes from TAD. I was recommended to put the 7025 high grade as the first tube (next to the input). I have to admit the results are very very good, way better than the original tubes from Sovtek (standard factory tubes). By the way I use this amp at home and it is way to loud to get a decent tube sound out of it. So I contacted Laney UK and they 'suggested' (after quite a lot of emails) to take out 2 power tubes (EL84) to give me 15 watts instead of 30 watt. (although they did not recommend it!!)

Anyway real tube amp sound at home !

10 Jan 2005

My Mesa Triaxis needs 5 tubes, and the last three now I use TAD 12AX7A/ECC83 Premium Selected giving to my Triaxis great sound!!!

I replaced the three tubes inside my Mesa 2:90 with TAD 12AX7A/ECC83 Premium Selected too!!!

I really recommend these tubes for who need a great professional sound.

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