PSVANE WE300B PLUS vacuum tubes Western Electric replica Valve 300B
Best Matched Pair brand new
The price is for a pair of PSVANE WE300B PLUS vacuum tubes Western Electric replica. PSVANE WE300B PLUS can place with the tube 300B perfectly.
If you buy 2pair(4 pcs), we will send the Factory full matched tubes to you.
Declaration
Features：
a) PSVANE WE300B PLUS, strictly follows the American Western Electric 1960s traditional craft meticulous build, whether sound or quality of any non-modern engraved 300B comparable.
b) The perfect combination of modern technology and antique materials, every detail with great accuracy, no compromise.
c) The design team from the United States and Europe, followed a large number of original drawings on the premise of combining the depth of refining school sound way electronics and sound aesthetics.
Specifications:
Filament heating
Uf (DC) .................. 5V
If (DC) ............... 1.2A
Static parameters
Ua ........................ 300V
-Ug ..................... 60V
Ia ........................ 60mA
Gm ........................ 5.5mA / V
ri ........................ 0.7 KΩ
u ........................ 3.85
Pout ..................... 6.6W
Limit Ratings
Anode voltage ............... 480V
Anode dissipation power ......... 40W
Cathode current
Self-bias .................. 100 mA
Fixed bias ............... 70 mA
Capacitances
Input capacitance ............... 9PF
Output capacitor ............... 4.3PF
Cross Road capacitor ............... 15PF
Typical operating parameters
Audio Amplifier
Class A1 enlarge :
Ua -Ug Ia RL Pout 2nd
V V mA Ω W db
200 42 30 2000 3 20
200 39 40 2500 2.6 26
250 55 30 2000 4.9 18
250 52 40 3000 4.0 26
250 50 50 2500 4.4 26
250 48 60 2000 4.7 26
250 48 60 2700 4.1 30
250 45 80 1500 5.0 26
300 65 40 2500 6.7 20
300 63 50 2000 7.2 21
300 63 50 3000 6.1 26
300 61 60 2400 6.6 26
300 58 80 1700 7.5 26
350 76 50 3600 7.8 26
350 74 60 2000 10.2 21
350 74 60 3000 8.3 26
350 74 60 4000 7.0 30
350 71 80 2200 9.6 26
400 91 40 5000 8.4 26
400 89 50 1000 11.5 21
400 89 50 4000 9.4 25
400 87 60 3500 10.5 26
400 84 80 2500 12.5 25
450 104 40 6000 9.5 26
450 102 50 5000 10.7
Some precautions about using high voltage power tubes:
Unlike other vacuum tubes such as KT88 or EL34, which typically run at 450V plate voltage, high voltage power tubes such as 845, 805 and 211 run at plate voltage 900V or even higher depending on your amp design. Due to the high voltage in the circuit, biasing an 845 / 805 or 211 amp improperly may expose you to lethal high voltage causing instant death. If you haven’t owned any tube before, we recommend you not to start with a 845 /805/211 tube amps until you get comfortable with maintaining a lower voltage tube amp such as EL34 / KT88 or 300B amps.
Always bias your amplifier by strictly following your amp manufacturer’s instructions. Do not bias the plate current over suggested reading (usually in mA) in any case. This will cause tube overheat, tube failure and burning out other parts inside your amp.
High voltage tube has maximum rating of plate heat dissipation (see specification link on each tube listing page). Do not run your amp at a plate current that could cause the tube plate turn red hot. When you start using a new tube, try it first in a room with dark light so that you can observe the plate color closely. If the plate turns red hot, turn down your amp bias immediately until the plate no longer show overheat symptom. Bias the two channel’s plate current readings to the same safe level for both. It’s not recommended to have two channels biased at different level.
Plate heat dissipation (measured in watts) = plate voltage (in Volt) x plate current (in mA) / 1000
For example, if a tube amp has plate voltage of 960V on the 845 tube by design, and the 845 tube has max plate heat dissipation rating of 75w, your maximum plate current bias reading should be 78mA. If the amp has plate voltage of 910V by design, your maximum plate current bias reading should be 82mA. It is not recommended run a tube constantly at its peak rating so ideally you should set your plate current bias at about 10% below the maximum. This will prolong your tube life and ensure a safe and long term enjoyment of your amp.
Although each tube amp has its designed plate voltage for tubes at a fixed input power voltage, a variation of more than 5% of your input power voltage will cause the plate voltage for tubes vary greatly (for example, swing from designed 910V to 950V or even higher). In such a case, your tube could be overheated and fail in a very short time. It’s strongly recommended to use a power conditioner properly designed for audio with your tube amp to reduce the possibility of such an accident and financial loss.
An excellent tube amp design along with poor selection of parts and poor production quality control could also cause your amp to overheat a tube and cause it fail prematurely. Always choose amplifiers made properly for your local voltage from a reputable reseller. In the past, we have seen many after-market modified Chinese tube amps which have been sold into North America with main transformers not designed for the right voltage, and cause not only inferior performance, but also tube failure or burning up components.
Last but not least, never leave your tube amp unattended for extended period of time. Never leave a 845/805/211 high voltage tube amp on without anyone in the room.
Due to the complicated feature of a tube amp’s design and user’s settings and maintenance vary greatly, tube manufacturer only warrant a vacuum tube for 30 days. If a tube has inherent manufacturer defect, it will show in the first 30 days of normal use and it will be covered by warranty. Improper usage including using in an amp not suitable for the tube or set bias too high or too low, input power spikes etc will result in tube failure prematurely – such incidence will not be covered by tube manufacturer’s warranty.
