Music Fanatic
Headphoneus Supremus
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Please keep us posted as your adventures with this amp continue.
AKG SAC K1000 Amp Polarity?
- Thread starter Edwood
- Start date
Count on it.
I have to buy smaller test leads for my DMM, or get some wire, I can put into the little sockets for the front outputs. My test leads are too big to test the output pins 2 and 3.
-Ed
I have to buy smaller test leads for my DMM, or get some wire, I can put into the little sockets for the front outputs. My test leads are too big to test the output pins 2 and 3.
-Ed
Orpheus
Headphoneus Supremus
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you can buy the leads... or i usually just cut a piece of my solder to test stuff really fast. just cut a 1.5" chunk and clamp it with your normal lead. it goes into those female XLR's fine. i mean, you don't need perfect measurements.... you're just determining if your polarity is backwards.
I was trying to use wires, and it was either too big or small to fit.
(female XLR)
Solder sounds like a great idea. Thanks.
I guess I can use 60/40 solder for something.
-Ed
(female XLR)
Solder sounds like a great idea. Thanks.
I guess I can use 60/40 solder for something.
-Ed
Between pin 2 and 3 = 1.0 ohm
Trying all other pin combination does not give any readings when the amp is plugged in, and the power switch is off.
-Ed
> Okay, this indicates that the impedance is out of
> range (>>
> upper limit).
>
> Could you please check the impedances between
>
> pin 2 and 3
>
> pin 1 and 4
>
> ?
>
> Jan
I wonder what this means?
Trying all other pin combination does not give any readings when the amp is plugged in, and the power switch is off.
-Ed
> Okay, this indicates that the impedance is out of
> range (>>
> upper limit).
>
> Could you please check the impedances between
>
> pin 2 and 3
>
> pin 1 and 4
>
> ?
>
> Jan
I wonder what this means?
Music Fanatic
Headphoneus Supremus
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I'm so glad you are following up on this. I've met several people with bad experiences with this amp, although it has near legendary status.
No wonder this amp disappeared into obscurity. This is really crappy quality control. Unless AKG changed the polarity of the K1000's somewhere down the line. But that's doubtful, because I never heard anyone complain about that.
I won't even go there about the big ass power brick that won't fit anywhere.
-Ed
I won't even go there about the big ass power brick that won't fit anywhere.
-Ed
Music Fanatic
Headphoneus Supremus
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And it runs hot too, I bet. Unlike the Grace!
Dear Ed,
> Between pin 2 and 3 = 1.0 ohm
> Trying all other pin combination does not give any
> readings when the amp is plugged in, and the power
> switch is off.
Okay, this indicates that pins 2 and 3 are the ones that are
connected to ground.
It seems that the connections to pins 3 and 4 have been
switched.
If you have some soldering skills:
1. Remove the screws of the right connector.
2. Pull the connector out.
3. Internally each pin is connected to 2 wires. One wire goes to
the left connector and one wire is connected to the electronics
inside. The wires of pins 3 and 4 that connect to the
electronics should be switched.
4. Reassemble the amp and enjoy!
Success!
Jan
> Between pin 2 and 3 = 1.0 ohm
> Trying all other pin combination does not give any
> readings when the amp is plugged in, and the power
> switch is off.
Okay, this indicates that pins 2 and 3 are the ones that are
connected to ground.
It seems that the connections to pins 3 and 4 have been
switched.
If you have some soldering skills:
1. Remove the screws of the right connector.
2. Pull the connector out.
3. Internally each pin is connected to 2 wires. One wire goes to
the left connector and one wire is connected to the electronics
inside. The wires of pins 3 and 4 that connect to the
electronics should be switched.
4. Reassemble the amp and enjoy!
Success!
Jan
Quote:
Yeah, THe SAC gets pretty hot. Not painfully so, but not something you'd want to hold onto for along time.
The Grace get warm. But that's it.
Does this mean that the Grace is running in Class AB operation?
-Ed
| Originally posted by Music Fanatic And it runs hot too, I bet. Unlike the Grace! |
Yeah, THe SAC gets pretty hot. Not painfully so, but not something you'd want to hold onto for along time.
The Grace get warm. But that's it.
Does this mean that the Grace is running in Class AB operation?
-Ed
So according to Jan, I Just swap the Green (Pin3) and Yellow (Pin 4) wires?
Since it appears that both the outputs are wired in parallel, wouldn't I need to swap the same wires on the other output(Left one) too?
-Ed
Music Fanatic
Headphoneus Supremus
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Quote:
It would seem so -- you notice the bad audio on both connectors, right?
| Originally posted by Edwood Since it appears that both the outputs are wired in parallel, wouldn't I need to swap the same wires on the other output(Left one) too? |
It would seem so -- you notice the bad audio on both connectors, right?
Well, Jan's advice worked.
I swapped the pins 3 and 4 on the left connector.
Oh boy what a difference it makes.
They are indeed wired in parallel, so both would need the swap to have the same polarity. I'm leaving the right output in the "reversed" position for now. Maybe there are a few K1000's that have them reversed. I don't know. It just looked too difficult to swap the doubled up wires, so I opted to do the left connector.
Letting the SAC warm up. It takes nearly two hours to fully warm up.
Right now it sounds very similar to the Grace, but with more power.
-Ed
I swapped the pins 3 and 4 on the left connector.
Oh boy what a difference it makes.
They are indeed wired in parallel, so both would need the swap to have the same polarity. I'm leaving the right output in the "reversed" position for now. Maybe there are a few K1000's that have them reversed. I don't know. It just looked too difficult to swap the doubled up wires, so I opted to do the left connector.
Letting the SAC warm up. It takes nearly two hours to fully warm up.
Right now it sounds very similar to the Grace, but with more power.
-Ed
Music Fanatic
Headphoneus Supremus
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Glad you got it working. I hope you'll post a detailed review soon.
Have you thought about converting one of the connectors to be a standard headphone jack?
Have you thought about converting one of the connectors to be a standard headphone jack?
gerG
Headphoneus Supremus
Yeah, as long as you have the iron hot:
The SAC runs warm for 2 reasons:
1) it is a high output amp running in class A. That will generate heat!
2) the internals are actually heat sinked to outside. The heat is being rejected as it should be. Owners of class A amps should check to make sure that the internal components aren't running hot enough to boil water.
Right now my SAC is idling along plugged into a pair of HD650 with one of Jan's new headphone cables. Absolutely wonderful!
gerG
The SAC runs warm for 2 reasons:
1) it is a high output amp running in class A. That will generate heat!
2) the internals are actually heat sinked to outside. The heat is being rejected as it should be. Owners of class A amps should check to make sure that the internal components aren't running hot enough to boil water.
Right now my SAC is idling along plugged into a pair of HD650 with one of Jan's new headphone cables. Absolutely wonderful!
gerG
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