Greetings All,
I just bought a floor model, Dark Terror in a music store in Peru and living in Ecuador I have no warranty.
Long story short:
After getting back home to Ecuador and having the amp plugged into my Laney LH212H (8ohm) and playing for a short bit, I noticed that a hum developed even when there is nothing plugged in and all knobs are fully counter-clockwise. It is much louder than the typical hiss I'd expect from an amp. Switching the amp tp 15w, the hum changes a little and ever so slightly, louder. I can raise the volume while playing to drown out the hum and it sounds fine except for the low-level hum.
Things I checked:
Line Selector correctly set to 110v (originally it was set to 220V)
Cables - all my cables have been cross-checked
AC Power - relatively clean and none of my other audio equipment exhibits electrical noise.
Reseated all the tubes (valves) I noticed that the 12AT7 was a different manufacturer and not JJ as all the other tubes.
Regardless, since tubes are not readily available in my area, I ordered a complete set of JJs thru Amazon and I should get them late January.
Could it be a faulty line filtering Capacitor or a bad 12AT7...
Any thoughts would greatly be appreciated.
Thank you,
George
New Dark Terror Hum with no signal
Moderator: bclaire
-
- Duke of Orange
- Posts: 6821
- Joined: Tue Aug 18, 2009 9:08 am
- Location: Derby, England
Re: New Dark Terror Hum with no signal
It could be anything.....
Has your guitar humbuckers or single coils? (Though i assume that isn't the issue?)
Valve is very possibly the issue, but it could be any of them. Any of the 12AX7, 12AT7 or EL84.
I would recommend you swap them all, but 1 by 1, so you can isolate the noisy one and discard it. If it's one of the EL84, it's preferable that you keep a matched pair in.
Has your guitar humbuckers or single coils? (Though i assume that isn't the issue?)
Valve is very possibly the issue, but it could be any of them. Any of the 12AX7, 12AT7 or EL84.
I would recommend you swap them all, but 1 by 1, so you can isolate the noisy one and discard it. If it's one of the EL84, it's preferable that you keep a matched pair in.
Ant
Orange Gear: RV50 MKI, R30, AD15, PPC212
And.... Genz Benz Black Pearl 30
Past Orange: AD30TC Combo, TT, AD5
Guitars: Gibson Les Paul Standard Faded, Vigier Expert Retro 54, Gibson SG 70s Tribute, Aria Pro II RS X80, G&L ASAT Special Tribute
Orange Gear: RV50 MKI, R30, AD15, PPC212
And.... Genz Benz Black Pearl 30
Past Orange: AD30TC Combo, TT, AD5
Guitars: Gibson Les Paul Standard Faded, Vigier Expert Retro 54, Gibson SG 70s Tribute, Aria Pro II RS X80, G&L ASAT Special Tribute
Re: New Dark Terror Hum with no signal
Thanks for the response:
@Les Paul Lover :
Has your guitar humbuckers or single coils?
It happens when there is nothing connected to the amp. No other guitar or amp I own hum.
@Les Paul Lover :
Valve is very possibly the issue, but it could be any of them. Any of the 12AX7, 12AT7 or EL84.
I figured as much...Hoping someone would suggest a filter cap....
Regardless, I have to wait until late January for my tubes to arrive.
Thank you
George
@Les Paul Lover :
Has your guitar humbuckers or single coils?
It happens when there is nothing connected to the amp. No other guitar or amp I own hum.
@Les Paul Lover :
Valve is very possibly the issue, but it could be any of them. Any of the 12AX7, 12AT7 or EL84.
I figured as much...Hoping someone would suggest a filter cap....
Regardless, I have to wait until late January for my tubes to arrive.
Thank you
George
Re: New Dark Terror Hum with no signal
Just wanted to follow-up in case someone else experiences this issue.
Finally received the replacement JJ 12AT7 tube and it took care of the issue. No more hum.
I went ahead and replaced all the tubes with JJ's and the amp never sounder better, quieter and louder.
Finally received the replacement JJ 12AT7 tube and it took care of the issue. No more hum.
I went ahead and replaced all the tubes with JJ's and the amp never sounder better, quieter and louder.
Who is online
Users browsing this forum: No registered users and 229 guests