Applemacman
New member
Hi one of my diodes has broken off the tube socket and the lead broke while try to resolder it, was wonder if i could use a different type of diode as a replacement or do i hv to use the same ones?
Diodes used on tube socket
- Thread starter Applemacman
- Start date
You can install a wire jumper between A3 and A8 instead of the second diode.
Applemacman
New member
Do u mean leaving the one diode i hv in pace then running the jumper between a3 and a8
Yes.
Applemacman
New member
I did that and got no sound whatsoever so guessing i need to trst the voltages
Applemacman
New member
I noticed the remaining diode is not lighting up
You need to measure your voltages and check your resistances. If you don't do this, you don't know if your amp is working properly and you can damage your headphones or harm yourself if the amp is not functioning properly.
Applemacman
New member
The issue is ive modified the amplifier and i just swapped out the original tube socket for a new one eveything was fine before the change of socket thats when the diode broke
You need to measure your voltages and check your resistances. If you don't do this, you don't know if your amp is working properly and you can damage your headphones or harm yourself if the amp is not functioning properly.
Applemacman
New member
My point being if ive modified my amp would the resistances still be as shown in the manual
Applemacman
New member
Voltages measured with amp powered on
1. 157
2. 163
3. 0
4. 163
5. 159.5
6.0
7. 157.6
8.0
9. 258.5
10. 0
Resistance measured with amp powered on
1. OL
2. OL
3. 0
4. OL
5. OL
6. 0
7. OL
8. 0.2
9.OL
12. -0.2
13. -0.2
14. -0.4
20. -0.6
22. 0.2
B3.OL
B6. OL
RCA 91.8 K
RCA 88.6 K
1. 157
2. 163
3. 0
4. 163
5. 159.5
6.0
7. 157.6
8.0
9. 258.5
10. 0
Resistance measured with amp powered on
1. OL
2. OL
3. 0
4. OL
5. OL
6. 0
7. OL
8. 0.2
9.OL
12. -0.2
13. -0.2
14. -0.4
20. -0.6
22. 0.2
B3.OL
B6. OL
RCA 91.8 K
RCA 88.6 K
Applemacman
New member
Sorry
9. 158.5 volts
9. 158.5 volts
Applemacman
New member
Oh i hv the speedball board also
Is the 12AU7 glowing?
What DC voltages do you get at A3 and A8?
What DC voltages do you get at A3 and A8?
Applemacman
New member
Yes its glowing i will check those other points tomorrow and let you know
Applemacman
New member
A3. 14.72 volts
A8. 14.92 volts
A8. 14.92 volts
Applemacman
New member
Anybody hv an answer
You need to replace both the LEDs. Be careful when you solder them, as it doesn't take a ton of heat to damage them.
Applemacman
New member
So wouñd that be the reason also why i get no sound?
Your amp is not working. You shouldn't be listening to it.
When you swap out a tube socket or other parts, you need to do a voltage check to be sure the amp isn't working, otherwise you may be sacrificing your headphones to learn whether or not the amp is safe to use.
You need to replace the LEDs and recheck the voltages and let us know if any are still not what they are supposed to be. If all the voltages check out OK, then you can listen to the amp.
When you swap out a tube socket or other parts, you need to do a voltage check to be sure the amp isn't working, otherwise you may be sacrificing your headphones to learn whether or not the amp is safe to use.
You need to replace the LEDs and recheck the voltages and let us know if any are still not what they are supposed to be. If all the voltages check out OK, then you can listen to the amp.
