Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
I have a couple of Studio Projects VTB1 mic pre's. They don't have an
on/off switch, you plug them in and they're on. However, when turning them off i.e. turning off the power strip they're plugged into, I notice that the level meter slams into the full/max red zone. It doesn't matter where the input/output gain controls are set, does this every time. Is there any reason to be concerned about this? They seem to work fine so far, but I cringe every time this happens. Obviously I have to be able to turn them off and the manufacturer hasn't provided any other way to do it. Is this normal and nothing to be concerned about? Thanks for all shared wisdom. |
#2
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
|
#3
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
wrote:
However, when turning them off i.e. turning off the power strip they're plugged into, I notice that the level meter slams into the full/max red zone. It doesn't matter where the input/output gain controls are set, does this every time. Yes, all equipment with single-ended electronics do this. You're seeing the capacitors discharging unequally. Some give a similar thump on power up. You worry too much. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
However, when turning them off, I notice the level meter
slams into the full/max red zone. Slams into the zone, or slams into the peg stop? The former is harmless. The latter is potentially damaging to the meter, if it happens over and over. |
#5
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
Mike Rivers wrote:
However, when turning them off i.e. turning off the power strip they're plugged into, I notice that the level meter slams into the full/max red zone. It doesn't matter where the input/output gain controls are set, does this every time. Is there any reason to be concerned about this? No. And if it had a power switch, you'd see the same thing. Put a piece of duct tape over the meters if it bothers you. Feisty, huh Mike? But yes, I notice this happening with all my meters. Mic pre's, mixers, effects processors, you name it. Since I have been observing this happening for several decades, I assume it is probably safe. |
#6
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
"William Sommerwerck" wrote in message ... However, when turning them off, I notice the level meter slams into the full/max red zone. Slams into the zone, or slams into the peg stop? The former is harmless. The latter is potentially damaging to the meter, if it happens over and over. They're green/amber/red lights. |
#7
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
|
#8
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
"Doc" wrote in message nk.net... "William Sommerwerck" wrote in message ... However, when turning them off, I notice the level meter slams into the full/max red zone. Slams into the zone, or slams into the peg stop? The former is harmless. The latter is potentially damaging to the meter, if it happens over and over. They're green/amber/red lights. Doesn't even make the top 500 list of things to be concerned about. |
#9
Posted to sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
"Richard Crowley" bravely wrote to "All" (17 Dec 05 23:30:25)
--- on the heady topic of " Concerned about damaging preamp on turnoff" RC From: "Richard Crowley" RC Xref: core-easynews rec.audio.pro:1060288 RC sci.electronics.repair:351810 RC "Doc" wrote in message RC nk.net... "William Sommerwerck" wrote in message ... However, when turning them off, I notice the level meter slams into the full/max red zone. Slams into the zone, or slams into the peg stop? The former is harmless. The latter is potentially damaging to the meter, if it happens over and over. They're green/amber/red lights. RC Doesn't even make the top 500 list of things to be concerned RC about. Indeed, never mind about the lights and meter needles... The main thing I'd really be concerned about is damaging junctions. The reason is that each time a junction carries a substantial reverse current it might cause some ionization in the semiconductor material. The consequence of this is a permament shift in the characteristics such as lower gain and increased noise. So there is some advantage in protecting junctions likely to encounter such transient spikes. A*s*i*m*o*v .... All the world's an analog stage & digital circuits play only bit parts |
#10
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
|
#11
Posted to rec.audio.pro,sci.electronics.repair
|
|||
|
|||
Concerned about damaging preamp on turnoff
"Bill Lorentzen" wrote in message news:tGipf.4705$7f3.1248@trnddc01... Or just get a Clapper. heh heh... |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Preamp problems on a guitar amp | Electronics Repair | |||
Phono Preamp | Electronics Repair |