Stereo Vacuum Tubes PSVANE WE845 audio DIY replica western electric
Valve Tube
Item specifics:
Type: Vacuum tube
Brand: PSVANE
Model: WE845
Country/Region of Manufacture: China
Description:
1. History of 845 tubes:
845 tubes were first introduced by RCA in early 1930s to compete
with then industry leader Western Electric. This is also the first
3-element vacuum tube to delivery 60 watts per channel power when
used in push-pull circuit design with a manageable physical size.
The RCA845 became a milestone of vacuum tube production.
2. In 1937, Western Electric responded to competition from RCA845
with their newly designed WE284A – which was considered by users to
deliver more lively sound than the RCA845 and with very similar
electric specifications. WE284A then became the new benchmark of
845 tubes for the entire industry.
However at that time the electronics industry didn’t have many
applications for this type of high output power tubes so demand was
very limited. Not many WE284A tubes were produced then and even
fewer are still around today.
3. Owning a pair of original Western Electric 284A is a dream for
many HiFi audiophiles who own 845 tubes amps, in order to
experience what the past glory of tube production could bring to
their music system today. However, the scarcity has driven the
price to very high level that many audiophiles cannot afford or
obtain.
4. Creation of Psvane WE845:
The Psvane WE845 is a hybrid creation by combining the
characteristics of both RCA845 and WE284A tubes. The first Psvane
WE845 prototype was sent to Japan in late 2012 for evaluation and
the reviewer commented: ‘It’s an ultimate pleasure to re-live the
RCA845 sound from Psvane WE845 and I hope you can improve the sound
to the WE284A level.’. Psvane design team took another 8 months to
improve on design then we come to have today’s final version of the
WE845 Replica.
Feature:
5. WE845 is direct-heated type thorium tungsten cathode triode,
class A1 and AB1
Heater
Uf---------------------------------------10 V
If----------------------------------------3.25 A
Maximum Rating
Ua----------------------------------1250 V
Pa-------------------------------75 W
Pout(max.sig)--------------------------150 W
Ia(max)------------------------------120 mA;
Direct Interelectrode Capacitances
input----------------------------------6 PF
output----------------------------------4.5 PF
grid to plate----------------------------------14.5 PF
Static parameter
Ua--------------------------------------1250 V
—Ug-------------------------------------200 V
Ia---------------------------------------80 mA
Gm--------------------------------------3 mA/V
ri----------------------------------------1.7 KΩ
u----------------------------------------5
RL---------------------------------------3.4 KΩ
Ug(pk)------------------------------------69 V
Pout-------------------------------------15 W
Recommended Operating Conditions(reference value
class A1 .single tube:
Ua-----1000 1000 1250 V
—Ug--- 145 155 209 V
RL-----6 9 16 KΩ
Ia------90 65 52 mA
Gm-----3.1 — — mA/V
Ug(pk)--— 110 148 V
ri------1.7 1.9 2.1 KΩ
Pout----24 21 24 W
Push-pull.class AB1:
Ua------------------ 800 1000 1000 1250 V
—Ug---------------- 125 170 175 225 V
RL------------------ 4.5 4.6 4.6 6.6 KΩ
Ia--------------------80 70 40 40 mA
Ug(pk)----------------177 240 — — V
Ia(mAx.sig)---------170 230 230 240 mA
Pout----------------40 75 75 115 W
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