Tips:
1. If there is no prompt, the default delivery is the gourd type, 5V, white porcelain seat
2. Model: 300B / n electron tube, white porcelain base, screen gold feet
3. Two shapes: eggplant type and DOME type (same price)
4. Two kinds of tube bases: black bakelite base and white porcelain base (same price)
5. The font color is shipped randomly (red or blue)
Features: It is a dome-shaped or eggplant-shaped glass bulb, four white ceramic bases with gold-plated legs, direct-heating oxide cathode, mesh plate electrode, graphite plate electrode triode.
Uses: used for audio amplifier, the output power is 8.5W
Standard working status and parameters:
Heating voltage * ........................................................................ 5V or 2.5V
Heating current ...................................................... 1.2A or 2.4A
Plate voltage ……………………………………………………………… 300V
Gate voltage ** ........................................................................- 58V
Plate resistance ..................................................................... 700ohms
Plate current ……………………………………………………………… 60mA
Magnification ........................................................................ 3.85
Transconductance .............................................................................. 5.7mA / V
Gate current ........................................................................ 0.05μA
* AC filament power supply or DC filament power supply
** The AC filament power supply grid or plate circuit is connected to the secondary center of the filament transformer, the DC filament power supply, the grid anode power supply circuit is connected to the filament negative terminal.
Limit working value:
Maximum plate voltage …………………………………………………… 450V
Maximum plate power consumption ............................................................ 40W
Maximum plate current (when fixed bias is used) .............................. 70mA
Maximum plate current (when using self-supporting bias) ……………………… 100mA
For large quantities, please contact EECTECH for a good price
For delivery time:
Generally, we will dispatch the items within 7 days upon order confirmation; some items may need 15~21 days to get ready for delivery, then we will try our best to dispatch as soon as possible, or we will contact you and offer advice.
For Bulk order:
If you would like to place a bulk order, please contact us for better price and better delivery cost.
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