PSVANE WE274B Vacuum Tube rectifier electron tube 5U4G/5Z3P/5R4GY/5AR Pair

Parameter： 
This Psvane HiFi Series 274B is an interim product for re-producing the legendary WE274B 1:1 replica. It doesn’t have 100% same appearance as the original WE274B but sound quality is probably the best among all current production rectifier tubes. (The final WE Replica series WE274B 1:1 will be available at future date upon factory notice) 

On some Chinese webpages, this tube is referred as WE274B Replica because some original WE filament materials are used in producing this tube. To avoid confusion with the future to-be-released WE Replica 1:1 274B, we have categorized this clear glass tube under the HiFi series (T-series are black bottle tubes). 

If you have been stuck with so-so quality 5U4G, 5AR4, 5Z3P and 274B rectifier tubes from other brands, this is the opportunity to get the newest current production rectifier tube without having to spend a small fortune. 

Rectifier tube’s life span in a tube amplifier is hard to predict – a power spike could easily kill a rectifier tube; but good rectifier tube will make your amp really sing. Use proper power conditioner with your tube amp to extend your tube life and protect your investment. 

Note: This rectifier tube may produce a power-on flash at amplifier’s start-up. The flash happens randomly with some tubes but not others. The power-on flash is in fact produced by the tube heater at high temperature and will disappear itself in less than a second. This flash does NOT indicate tube quality or life expectancy, and it is not a manufacturer defect. It will not hurt your amplifier by any means and will not damage your speakers. Some NOS tubes from 1940s have flashed over half a century and are still singing in some amplifiers. You may NOT request us to ship a tube WITHOUT flash because this is completely random and cannot be predicted, controlled or selected by manufacturer or tube seller. We also cannot accept warranty return request due to tube power-on flash. If you do not agree to this term, we respectfully ask you please do not place your order. 

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. 

T-Collection Grade is high-end tubes of brand PSVANE.