look-audio

EL84 de la marque Sovtek  très robuste, bon équilibre du spectre sonore,aux références citées ci dessus mais ca reste très intéressant. Microphonie correcte. .

EL84 tube: "The Sovtek EL84 tube has been a staple for Fender, Boogie, Crate, Peavey and other manufacturers of tube amps using the EL84 tube. This EL84 tube really is a good value. It is predictable, reliable and affordable. You can get good EL84 tone at a reasonable price. The Sovtek EL84 tube has been around a long time, and it has shown continuous improvement over the years. Using a matched set of properly biased tubes will yield a clear smooth sound that is fairly warm and transitions into a smooth breakup with that singing tone that EL84 tubes are known for. In Cathode biased amps like the VOX they get a premium workout and will suffer some effects from heating and cooling. Being prone to mechanical noise in a combo amp, the EL84 tube is not recommended for amps with poor air circulation. The heating/cooling cycle inside an AC30 easy bake oven seems to loosen up the mechanical structures within the tube causing them to become very noisy (mechanically) with time."

Tubes 2A3C Shuguang la meilleure production actuellement le Bulbe resemble au tube 300B

Vendu par paire Matched

Excellent quality Mono plate 2A3

I say it is the best current prodution.
ST-Shape and look same as 300B
Black plate
Factory matched pair
Excellent value compare with 300B
Weight :400 (gram/pair)
Brand : Shuguang

Tube Sophia Electric 2A3 Mesh Plate  embase céramique vendue par paire  appairées

Sophia Electric™ 2A3 Vacuum Tube Mesh Plate Tubes Specification

Filament voltage *2.5V
Nominal filament current 2.5A
Plate voltage 250V
Grid voltage (AC filament) -45V
Plate current 60mA
Plate current 62.5 mA
Amplification factor 4.2
Grid current 0.05 µA
Plate resistance 800 ohms
load resistance 2500 ohms
Maximum plate voltage 300 volts
Maximum plate dissipation 15 watts

Vendu par paire Matched

Copper base

Stronger internal support

Excellent packing

Tested and Matched pair

Much more details than the cheap one

Still much cheaper than most 300B

Excellent quality

Highly Recommend

New design look like Amperex

Weight :900 (gram/Pair

Vendu a L'unitée

Custom made, limited supply

OEM by Shuguang

Ceramic base, blue glass

I feel it is the best current production 6SN7/CV181 or similar tube

Good NOS tube sky price already

Weight :100 (gram

Brand : Shuguang

Vendu par paire Matched

My favoriate low cost 300B

Excellent for entrance level and beginner

Weight :400 (gram/Pair)

 6L6 GC si vous prenez plusieurs tubes il vous seront livré appérez si vous le demandez pas de surcout pour cette option

Tesla is a world renowned name and was a state enterprise of Czechoslovakia covering a variety of electronic products as well as tubes (audio, transmitting and others). Now, since the country has divided, the audio tubes are manufactured in Slovakia and the manufacturers have changed their name to JJ Electronic.

QQE 0640 si vous prenez plusieurs tubes

il vous seront livré appérez

si vous le demandez pas de surcout pour cette option

Double tetrode

6C33 si vous prenez plusieurs tubes il vous seront livré appérez si vous le demandez pas de surcout pour cette option

Triode de forte puissance utilisée en amplification HiFi.
Tube militaire de fabrication russe, très robuste.
Bons résultats en configuration "OTL".

Triode amplificatrice , modulatrice , oscillatrice , dissipation plaque 100 watts max , 3000 volts max , 225 ma max , fréquence max 40 mhz , EIMAC

Triode de puissance utilisée comme amplificateur , oscillateur et modulateur ,dissipation plaque 250 watts , fréquence max 40 mhz , trés utilisée en audio, EIMAC

THOMSON CSF Diode

Cathode tungstène
30 kW
0.1A

GU81M

Name GU81M

Type pentode

Cathode typetugsten,carbidized,direct heating

Application fiel

 power amplification up to 50 MHz

Brief application amplification, oscillation

Envelope   glass

Cooling method air

Dimensions 260mmx202mm

Mass 1 kg

Filament voltage 12.6 V

Filament current at most 11 A

Mutual conductance  4.5 to 6.5 mA/V

Gain coefficient 2.5 to 4

Output power   0.45 kW

Maximum anode voltage   550 V

Maximum operating frequency 50MHz

After launching the 50 year anniversary Treasure series in 2008, Shuguang has been developing new additions to its high end tube line to include large power tubes and small preamp tubes. With venture capital from?UK?and countless testing by Shuguang's Treasure design team, a new series called Psvane(pronounced as 'Pavane' - the brand is created from the inspiration of the 17th century classic music dance) T-series has born in Aug 2010.The Pavane T-series now include the following models: 845, 805, 211, 12AX7, 12AU7, 12AT7 and EL84. They are great compliment to the hugely successful Treasure series which includes the common EL34, KT88, KT66, 300B, 2A3 and 6SN7.

EML 320B-XLS Filament Ratings

Filament Voltage  5 Volt (AC or DC) 

Tolerance on filament voltage  5%

Filament Current   1.7 Ampere

Older types have 1.9Ampere

EML 320B-XLS Maximum Conditions 

 (Voltage and current not possible simultaneously - not a recommended operating point)

Plate Voltage    550Volt 

Plate Current     160mA 

Power Output in Class A  23Watt 

Grid resistor     max.50k Ohm

 Description
The XLS Series tubes are based on an extra large size (XLS)  plate system.  This system is taken from earlier EML 52B tubes, and has proven to be ideal for high power applications. 

The EML 320B-XLS  tube is a stronger version of the 300B.  The difference between the 300B  and the EML 320B-XLS is  the higher filament current of the 320B-XLS.

PUSH-PULL special note:

Push pull with (any) DHT is much harder for the tubes than SE. You may easily see low quality 300B fail in PP amplifiers. The higher filament current of the 320B-XLS allows higher plate current peaks, and this makes the tube so well suited for Push-Pull amplifiers.

The EML 320B-XLS will bias  like a normal 300B tube,  when used in any 300B amplifier,  but it is important to be check if the higher  filament current can be supplied by the amplifier.   When used like this, due to the stronger electron emission, this tube  will develop the output signal with  more ease. 

When biased higher than a standard 300B,   the EML 320B-XLS will show more of  it's superior quality. It will show a better dynamic behavior, and lower distortion at all power levels. 

All critical parts, like filaments, grids and plates are constructed of hard metal for higher reliability and reproducible quality. 
Features
Gold plated, Wolfram Grid
Soft rubber suspended tube base
Center tapped filament
Slow Start filaments, for best lifetime
Double Mica tube top
Hard metal Construction (Note1)
 Two extra large getters
 Hand blown Glass bulb
 Anti-microphonic plate- and grid  suspension
 These tubes are shipped in a high quality dual box
 Tube printing with real gold (metal),  red color is glass burned into the glass
 Machined, solid tube base pins for highest contact precision. YAMAMOTO tube sockets highly recommended.
 Gold plated pins,  black ceramic socket.  (White bottom.)