AV300B Datasheet. http://elektronenroehren.de/avvt

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AV 300B / 300M datasheet

We have two versions: The standard tube, called 300B, and a special version with mesh plates, called 300M.

The AV 300B is a direct replacement for the WE300B. The AV300M can also replace the WE300B, but only in amplifiers that work with a lower dissipation. There are two versions of the 300M. The first type 300M can work up to a plate dissipation of 17Watt. The second generation AV300M can work up to 27Watt.

Features

This tube uses AVVT's unique Super-Linear Patent (Note1)
AVVT's patented ribbon filaments with 16 flat Surfaces, for more linearity
Two extra large getters
Unbreakable Hard-Glass / Globe Glass / C37 Glass
Anti-microphonic Suspension in Tube Top (not with Globe tubes)
Unbreakable hard-metal filaments. (Note2)
Ceramic UX4 Socket with Gold Plated pins


300M-GL 17Watt or 27Watt Mesh Version Pic1 - Pic2 Attention: NEVER put this is a standard 300B amplifier without first checking the plate dissipation!	GL Glass globe bulb for pure vintage sound	C37 Glass. Designed by Dieter Ennemoser, for natural sound.

There is a noticable sound difference between C37 glass and Globe glass, because of the different way the tube system is contacted to the glass. The GL Globe Glass is a retro design, back to the origin of the great triodes, still valued 65 years later. It has almost no interaction between the glass and the tube, and you can hear the triode sound in it's purest way. The C37 design has larger mechanical damping of the inner tube system, and produces a very natural sound. This design is made by Dieter Ennemoser, who is a violin builder, who has done works for well known brands, including Sony. We build the C37 glass shape in licence. The difference in sound is small, but can be very clearly heard when comparing both tubes.

Clicke here for Plate Curves

AV 300B / 300M Filament Ratings
Filament Voltage	5 Volt
Filament Current	1.3 Ampere

AV 300B / 300M Maximum Conditions (See also Note 3)	300B	300M until May2001	300M from June2001
Plate Voltage	550Volt	400Volt	450Volt
Plate Current	200mA	100mA	150mA
Plate Dissipation	40Watt	17Watt	27Watt
Power Output in Class A	14Watt	6Watt	9Watt

AV 300B / 300M Typical Data
Plate Voltage	300V
Plate Dissipation	18 Watt
Plate Current	60mA
Grid Voltage	-60Volt
Plate Impedance	640 Ohm
Amplification Factor	3,9
Transconductance	6.1 mA/V
Load Impedance	1500 - 3500 Ohm
Operating Lifetime	40.000 hours
Grid resistor	100k Ohm

AV 300B / 300M Mechanical Data
Size	170 x 65mm (Includes Socket)
Weight Standard Version	142 Grams
Weight C37 Version	135 Grams

For further information about our products, please visit http://www.jacmusic.com

Note 1) Super Linear Plates are based on an exclusive AVVT patent. The cold ends of the filaments do not have a very good function, and cause distortion. This tube has four cavities inside the plate, that cover the cold ends of the filaments. These cavities are covered by four nickel plates, that you can see from the outside. Within these cavities, anode current will not be able to flow, and this disables the emission of the cold end of the filaments.
Note 2) Hard-metal filaments are operated at much higher temperature than normal tubes. This tube will glow bright orange, instead of the dark orange color of nickel filament tubes.
Note 3) 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 has is numbered, inside the bulb with a metal Tag

Tube pictures with courtesy of VT-Components