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A WE-91B project
A WE-91B project
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Old 10th January 2018, 01:16 PM   #1
jerrylong is offline jerrylong  China
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Default A WE-91B project

Hi guys, a friend ask me to make a valve amp for him, I want to use WE-91B, since his speaker is TAD2402(sensitivity:93dB). He want to use 300B, so I think WE-91B is a good choice
1.jpg

this is the circuit I draw in Altium Designer, because I want to make it into PCB
2.JPG
some of the components has been set to 91B accroding the original schematic

It is impossible for to collect the original WE components to make this amp, so I deceided to use morden components to make it.
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Old 10th January 2018, 01:19 PM   #2
kstagger is offline kstagger  United States
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Like most of the DIY 91A builds, you won't need the input transformer or the first 310A. A single 6J7/6C6/310A will drive a 300B.
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Old 10th January 2018, 01:22 PM   #3
jerrylong is offline jerrylong  China
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The WE-91B is used in excitation speaker system, so there is no choke in the schamatic, I have read some article said the excitaion speaker system will consume about 100V of the power source
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Old 10th January 2018, 01:24 PM   #4
jerrylong is offline jerrylong  China
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Quote:
Originally Posted by kstagger View Post
Like most of the DIY 91A builds, you won't need the input transformer or the first 310A. A single 6J7/6C6/310A will drive a 300B.
I want to keep the first 310A to keep the original circuit as possible, and add a attenuator between the pre and 91B
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Old 10th January 2018, 01:38 PM   #5
jerrylong is offline jerrylong  China
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first of all, deceided the power trans T3(359A)
3.JPG

the WE documents of 359A
4.jpg

prim: 110V+120V
sec:492.5+492.5/130mA
10V/1.2A(for 310A*2)
5V/2A(for 274B)
5V/2.4A(for 300B)

since I will not use 91B in excitaion speaker system, it is not necessary to keep 492.5+492.5

my design is
prim:220V
sec:400V+400V/130mA
10V/1.2A(for 310A*2)
5V/2A(for 274B)
5V/2.4A(for 300B)
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Old 10th January 2018, 01:42 PM   #6
jerrylong is offline jerrylong  China
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then the input trans T1(285A)
it is a 30:200K input trans, it is not gonna uesed in my project
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Old 10th January 2018, 01:47 PM   #7
jerrylong is offline jerrylong  China
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finally the T2(171A)
5.jpg

my design is 3.5K:4,8
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Old 10th January 2018, 01:55 PM   #8
jerrylong is offline jerrylong  China
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this is the final schamatic, ready for simulation.
I used the ayumi's SPICE model of 310A and 300B, it is quite accurate
6.JPG
WE-91B.zip
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Old 10th January 2018, 02:00 PM   #9
jerrylong is offline jerrylong  China
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testing the first stage 310V
Input: Vpp=0.2V, sine,1KHz
7.JPG
9.JPG

and test the output from first 310A
9.JPG

the wave is strange, is there anything wrong?
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Old 10th January 2018, 04:24 PM   #10
jazbo8 is offline jazbo8
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A WE-91B project
Get rid of the PFB loop from the 300B and try again.
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