2A3-Mesh Datasheet. Emission Labs.

Not just an replacement, but an improvement!

2A3-Mesh

Datasheet for new Type with Gray mesh wire

Date: 01-Oct-2007

Description

This tube is a plug & play, direct replacement for original the RCA 2A3 monoplate tube. It features a mesh window in the plates. This combines the electrical stability of solid plate tubes, with the non-resonance mesh material. We think this is the most ideal combination for a low power audio tube.

When a tube is given mesh plates, something magic happens to the sound. We believe this is caused by the high damping properties of the mesh material. When using mesh tubes, you will experience what people call a more "transparent" sound stage, meaning a more realistic stereo reproduction of the original sound recording. With this quality product you will enjoy the very best of what small triodes have to offer.

The EML 2A3-Mesh tube is constructed for lowest microphonics. All critical parts, like filaments and grids are made of hard metal for higher reliability and reproducible quality. The tube base is now glued on the glass with anti-vibration rubber.

Features

Gold plated Grid
Gray Wire Mesh
Soft rubber suspended tube base
Center tapped filament
Fully compatible to solid plate 2A3
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.)

Type 2A3-Mesh
High. Res.Images:
Front - Side
Curves

2A3-Mesh Filament Ratings
Filament Voltage	2.5Volt (AC or DC)
Tolerance on filament voltage	4%
Filament Current	2.5Ampere

2A3-Mesh Maximum Conditions
Plate Voltage	350Volt
Plate Current	70mA
Plate Dissipation Continuous	17Watt
Highest possible Grid to ground resistor, Single Ended.	250kOhm
Highest possible Grid to ground resistor, Push-Pull.	50kOhm

2A3-Mesh Factory Test conditions
Plate Voltage	250V
Plate Current	60mA
Grid Voltage	matched
Transconductance	matched

2) Typical application Recommended operating point All bias methods are possible
Plate Voltage	250V
Plate Dissipation	15Watt
Plate Current	60mA
Grid Voltage	-45Volt
Plate Impedance (Rp)	800Ohms
Amplification Factor	4,1
Transconductance (Gm)	5,2mA/V
Load Impedance (Ra)	2500 Ohm
Power Output @ Ra = 2500k	3.5 Watt

2A3-Mesh Mechanical Data
	Size including Socket: 147 x 60 mm 5.8 x 2.7 Inch Attention: Series numbers below 860K have this glass size: Size including Socket: 175 x 60 mm 6.9 x 2.7 Inch This change is only for the glass bulb height
Single tube weight	140Gram
Shipped weight for double box with one pair	730Gram

Note 1)
Note 1) Hard metal has a higher melting point than classical nickel. Hard metal gives a more precise material shape, and does not change the shape when heated. This ensures reproducible tube parameters, and long term stability. Hard metals allow the most precise grid wire distance, and ensures better uniformity and linearity of the tube curves. With mesh tubes, we use a metal window of hard metal around the mesh wire.
Note 2) Individual Test data, such as: Matching Data, Grid Current, Vacuum, Filament Current, etc, are on the Certificate that comes with each individual Tube. Each tube is numbered, inside the bulb with a metal Tag
Note 3) Tube Curves: Made on the The Sofia Curve tracer, with courtesy of AMR, Wisconsin, USA.