| Content | GROOVE TUBES GT 12AT7 PREAMP TUBE
The Groove Tubes GT-12AT7 preamp tube is manufactured to the highest quality JAN spec. NOS, made in Russia for extremely long life.
Used widely in most U.S.-made amps and, in particular, Fender amps. Fender amps with reverb use 2 - 12AT7s -- one for the reverb drive stage, and one as a phase inverter to drive the push/pull output stage. The makeup of the 12AT7 is very similar to the 12AX7 and it can be substituted for a 12AX7 in a pinch. Some players prefer the 12AT7 in the driver stage of a Marshall for a cleaner, brighter tone. (The driver or phase inverter is the 12AX7 located nearest the power tubes.) The 12AT7 is rarely used in a tone-generating stage, but rather in function stages, so the Groove Tubes GT-12AT7 is selected for durability.
Country of origin: Russia | double-triode 6N1P-EV / 6H1Pi, close to ECC88, 6DJ8, 6922
EXTRA-durable, long-life (-EV version), military equipment.
Tubes are made in 1980s. Tubes not used (new) | 5751 can be used in most 12AX7 circuits to achieve more headroom.
It has a lower gain about 70% than the standard 12AX7. Good to rope the gain of a high gain amplifier.
| Tube Type: |
5751(12AX7/ECC83) |
| Socket: |
Noval(9 Pin) |
| These are the gold pin version of the standard ECC83. These tubes are immediately discerni-ble from other 12AX7. They have a construction that is similar to a frame-grid tube - similar to the Telefunken ECC803s. This construction makes them very rugged and reliable. This is one of the best new 12AX7 for any guitar amp. It is very musical - rich with great harmonics. An excellent tube in all Marshall amps in the three preamp positions.
Factory selected tubes with gold pins. These tubes provide high gain without the usual noise and microphonic problems you would expect. This is great sound and value for your money.
ECC83S is 12AX7 high gain pre-amplifying double triode. Thanks to its design it also peforms with very low noise and microphonics. Harmonically rich, with a detailed low end and a warm high end.
12AX7/ECC83/7025 / 9Pin Socket Noval |
Great warm clean tones, strong bass, punchy mids and fat overdrive with smooth top end.
No Microphony, No Hum - Clean Warm Tone, Punchy Mids, Fat Overdrive!
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
HIGHGRADE SELECTION
But only those tubes which pass these tests best are labeled Highgrades.
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.
| Tube Type: |
12AX7/ECC83/7025 |
| Socket: |
Noval(9 Pin) |
| Selection: |
Highgrade |
| Electro Harmonix EL34 EH Matched Pair(MP) Made In Russia
1 Pair matched vacuum from the excellent "Black base" pentode of high power.
Perfect EL34 for vintage equipment and to improve the performance of modern amplifiers.
Excellent music with a rich, smooth and detailed sound.
Tube Type EL34/6CA7/E34L
Socket: Octal(8pin) |
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