Tweet
Hey all!
My SVT keeps buggin' me........
Fiend of me lend it from me, put it in a wrong cab (8 ohm instead of 4) and it caused the speaker ground connection (secondary OT) to break, it blew a tube (and it's screen resistor) and broke the hum pot (and melted some heater wire).
I fixed all but noticed only late the broken OT ground connection. Before I noticed that it caused the power tubes to run hot (> 200mA) every time I powered up. After I connected the ground again it worked flawlessly.......
Almost flawless......... I noticed that the HUM pot was broken. So I replaced it with:
A. two fixed 100 ohm resistors to ground
And after I got it not working
B. A new 100 ohm resistor pot with the middle grounded
When I turn the unit on now I get the same problem as mentioned before (tubes run hot (>200mA). If I remove this the amp works perfectly (only has a slight annoying hum).
What can I do???? Any thoughts???? I grounded the hum pot at the same line that grounds the rest of the amp!
Edit; also on another ground it keeps the problem
It is a V9 btw; it has part of the poweramp elevated with a 10 ohm resistor.
The heater transformer reads approx 2 ohm secondary. Grounding the hum balance knob to the elevated grounds does nothing
Hmmmm, I think I missed something because when I measure the heater to ground I get 1.8k (without the hum balance pot) so I guess that there is something bleeding!
My SVT keeps buggin' me........
Fiend of me lend it from me, put it in a wrong cab (8 ohm instead of 4) and it caused the speaker ground connection (secondary OT) to break, it blew a tube (and it's screen resistor) and broke the hum pot (and melted some heater wire).
I fixed all but noticed only late the broken OT ground connection. Before I noticed that it caused the power tubes to run hot (> 200mA) every time I powered up. After I connected the ground again it worked flawlessly.......
Almost flawless......... I noticed that the HUM pot was broken. So I replaced it with:
A. two fixed 100 ohm resistors to ground
And after I got it not working
B. A new 100 ohm resistor pot with the middle grounded
When I turn the unit on now I get the same problem as mentioned before (tubes run hot (>200mA). If I remove this the amp works perfectly (only has a slight annoying hum).
What can I do???? Any thoughts???? I grounded the hum pot at the same line that grounds the rest of the amp!
Edit; also on another ground it keeps the problem
It is a V9 btw; it has part of the poweramp elevated with a 10 ohm resistor.
The heater transformer reads approx 2 ohm secondary. Grounding the hum balance knob to the elevated grounds does nothing
Hmmmm, I think I missed something because when I measure the heater to ground I get 1.8k (without the hum balance pot) so I guess that there is something bleeding!
)
Comment