Krell KSA100 MKI power consumption

I know for a fact that it consumes a lot of power at idle.

Why don't you ask the person who made the amp, i.e., Dan D'Agostino, instead of asking the question here?

Dan D'Agostino
Tel: 203-227-9099
petra@dagostinoinc.com

7 amps @ idle .................

Thanks for the inputs and thanks Raquel for the great tip about contacting the maker; I will certainly contact Mr. Krell.

7 amps at idle? That would be about 700 watts which is huge. My FPB300cx only uses 60W at idle, which seems more in line. Hope this helpes,
John

Jsd52756, 7 amps at idle for the KSA 100 seems about right. Dont't forget that the KSA 100 is class A all the way to 100 watts. The KSA series of amps did not have a sliding or sustained bias outputs as the newer models.

Jsd52756, the FPB300cx uses 60w on standby, 175 at idle and 1700w at full output.

guys, 7 amps at 220 volts converts to ~2000 watts. I don't think that makes sense.

The read on my meter is ~350 watts.

Mr. D'agostino (this amazing guy responded to my request immediatly!) says:
"The Ksa !00 did operate in pure class a. The top of the amplifier does not reflect the heat. After about 1 Hr of operation the bottom of the heat sink should be about 65 degrees c . I allways set the bias with a current prob. I could not tell you what voltage you should
measure across the emitter resisters. I no longer remember."

We assumed a North American Standard of 7amps x 110v = 770 watts. Take a look at another 100w amp and see what the current draw is at full output, because in Class A, your amp is at full output at idle...that is why it gets so hot because it need to dissipate all that power when not driving a load.

My old (100w Class A) ML 20.6 amps drew 500w each at idle for a total of almost 10 amp (1000w). Since the Krell KSA 100 is also 100w Class A, 700-800watts at idle does not seem that far off.

Real class A is about 25% efficient so 100 + 100 watts should require that amount x4 or 800 watts. Remember that true class A amps draw FULL current at idle. I use to sell the KSA 100s and they did draw a lot of current. Later Krell designs use a more efficient bias method in many cases.

it is 7 amps on a 120v circut on idle. But that is halved to about 3.5 amps on a uk 240v circuit. Amps are relative to voltage. 

Used to have (and loved) a pair of the KMA100s and they could certainly heat up a room-especially at idle or low volume. Would not be at all surprised if your KSA100 drew 7-8 amps at idle.

Fantastic amplifier the KSA100. 
I have mine hooked up to a dedicated 20amp line, and yes it draws 7-8amp at full power. 

I currently have a Krell KSA 50S with the sliding bias. The 50S was the baby of the line, 50 watts at 8 ohms. Class A and a wonderful amp. 

Mine runs as cool as a cucumber also.