Crack build resistance check
- Thread starter ekzotic
- Start date
0.5 Ohms is pretty close to 0 Ohms. What do you get when you just touch the probes together?
No measurement on the left RCA jack makes me suspicious that you might be missing the jumper that connects both terminals on the pot where black wires land.
-PB
No measurement on the left RCA jack makes me suspicious that you might be missing the jumper that connects both terminals on the pot where black wires land.
-PB
See page 21, first instruction, red and black arrows.
-PB
-PB
What does the meter actually say?ekzotic said:
Can you measure the resistance between the two white wires on the volume pot?
I would try reheating both solder joints with black wires on the pot.
-PB
-PB
Go ahead and fire up the amp with no 6080 and just a 12AU7. You either have a defective pot, a defective meeter, or a flaky solder joint. More information may be obtained from a voltage check.
ekzotic said:
The terminal with the black wire should show 0 ohms.
The middle terminal with the white wire should show 0-110K, depending on the position of the volume control.
The outside terminal with the white wire will show a static value somewhere between 90 and 100K.
-PB
Hi! So I did a voltage check (220v mains) and without 6080 tube:
1 86-87
2 215
3 0
4 215
5 83-84
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 215
14 0
15 220
20 0
21 222
A1 84
A2 0
A4 0
A5 0
A6 86
A7 0
A9 0
B1 86
B2 215
B3 0
B4 84
B5 215
B6 0
B7 0
B8 0
TRS
TOP 0
MID 0
Tube glows fine (as i think, never used tubes before), diodes glow fine too.
And I opened 6080 tube and it was looking old and rusty, is it fine? Can i clean it somehow?
Thanks for the help!
1 86-87
2 215
3 0
4 215
5 83-84
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 215
14 0
15 220
20 0
21 222
A1 84
A2 0
A4 0
A5 0
A6 86
A7 0
A9 0
B1 86
B2 215
B3 0
B4 84
B5 215
B6 0
B7 0
B8 0
TRS
TOP 0
MID 0
Tube glows fine (as i think, never used tubes before), diodes glow fine too.
And I opened 6080 tube and it was looking old and rusty, is it fine? Can i clean it somehow?
Thanks for the help!
I suspect that your pot is working OK, as the 12AU7 relies on the pot functioning to maintain proper biasing. Throw the 6080 in and repeat the voltage test.
-PB
-PB
Hi! Here are the results:
1 75
2 162
3 0
4 162
5 71
6 0
7 101
8 0
9 98
10 0
11 0
12 0
13 162
14 0
15 182
20 0
21 203
A1 71
A2 0
A4 0
A5 0
A6 74
A7 0
A9 0
B1 75
B2 162
B3 101
B4 70
B5 162
B6 98
B7 0
B8 0
TRS
TOP 5-0
MID 5-0
I went ahead and connected headphones (HD 600). I set the volume to zero on the amp and started the music and it was playing in my left ear. I decided to try the pot and it raised right headphone volume. Good is that i set my souce to low volume .. So I'm happy that it works but what's wrong with it?
Also do you know what brand is 12AU7A is used and how old is 6080?
Thank you!
1 75
2 162
3 0
4 162
5 71
6 0
7 101
8 0
9 98
10 0
11 0
12 0
13 162
14 0
15 182
20 0
21 203
A1 71
A2 0
A4 0
A5 0
A6 74
A7 0
A9 0
B1 75
B2 162
B3 101
B4 70
B5 162
B6 98
B7 0
B8 0
TRS
TOP 5-0
MID 5-0
I went ahead and connected headphones (HD 600). I set the volume to zero on the amp and started the music and it was playing in my left ear. I decided to try the pot and it raised right headphone volume. Good is that i set my souce to low volume .. So I'm happy that it works but what's wrong with it?
Also do you know what brand is 12AU7A is used and how old is 6080?
Thank you!
It might suffice to just replace the pot, as everything else looks A-OK in on your voltage checks.
-PB
-PB
Strikkflypilot
New member
If You want to know what 12AU7 and 6080 You've got, post images of them.
All markings and design structures should be showm
All markings and design structures should be showm
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