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09-18-2026, 04:08 PM
Hi Kevin,
Using your Va/Vs terminology, my latest full-PS loaded readings are:
1. W1-1 = Va input = B+ from standby: 331 V
2. W2-1 = Vs input = B2: 321 V
3. W1-2 = Va output = OT centre tap: ~325.6 V
Direct measured W1-1 → W1-2 loss = 5.37 V
4. W2-2 = Vs output = second scaled rail: ~317 V
So the input difference Va − Vs is about 10 V, while at full PS the two regulator losses are approximately:
Va side: 5.4 V
Vs side: 4 V
Output valve plates are then about 322 V and screens about 314 V after their respective winding/resistor drops.
I have not replaced M2 on this SV2. The earlier large loss disappeared after reducing R5 to about 270 kΩ as you suggested.
Best,
Steve
Using your Va/Vs terminology, my latest full-PS loaded readings are:
1. W1-1 = Va input = B+ from standby: 331 V
2. W2-1 = Vs input = B2: 321 V
3. W1-2 = Va output = OT centre tap: ~325.6 V
Direct measured W1-1 → W1-2 loss = 5.37 V
4. W2-2 = Vs output = second scaled rail: ~317 V
So the input difference Va − Vs is about 10 V, while at full PS the two regulator losses are approximately:
Va side: 5.4 V
Vs side: 4 V
Output valve plates are then about 322 V and screens about 314 V after their respective winding/resistor drops.
I have not replaced M2 on this SV2. The earlier large loss disappeared after reducing R5 to about 270 kΩ as you suggested.
Best,
Steve
