I have a pair of 8008BBs and a pair of 4004s that power my 7.0 HT. (No subwoofer...yet)
This required running four 10-gauge power wires from four new circuit breakers into four new duplex outlets (the $3.00 kind, not the $50.00 kind.) Since I have plenty of open sockets in my breaker panel, easy access to the wall of the media room to string the power and install the outlets, and I did it myself WITHOUT killing me, small children, or setting the house on fire, this cost about $70 and a few hours.
The 8008BBs run significantly warmer than the 4004s. In 15 minutes, they are up to temp (I have a thermometer on one of them, was concerned about overheating--turned out that 105-120 degrees F is perfectly normal for them. My understanding (and I could be wrong) is that an 8008BB is class A up to 25(!!!) watts, and A/B after that. The 4004 is class A up to 15 or so watts. Krell may be Class A for total rated power (Which is why they are all heat sink, and a couple hundred pounds), but most amps are out of class A after a couple of watts.
The saner solution is to buy the 8008X5 that is currently listed on A-gon. Doesn't use much more current than one 8008BB/ST, but split among the 5 channels that probably won't be too demanding anyway. A good compromise.
This required running four 10-gauge power wires from four new circuit breakers into four new duplex outlets (the $3.00 kind, not the $50.00 kind.) Since I have plenty of open sockets in my breaker panel, easy access to the wall of the media room to string the power and install the outlets, and I did it myself WITHOUT killing me, small children, or setting the house on fire, this cost about $70 and a few hours.
The 8008BBs run significantly warmer than the 4004s. In 15 minutes, they are up to temp (I have a thermometer on one of them, was concerned about overheating--turned out that 105-120 degrees F is perfectly normal for them. My understanding (and I could be wrong) is that an 8008BB is class A up to 25(!!!) watts, and A/B after that. The 4004 is class A up to 15 or so watts. Krell may be Class A for total rated power (Which is why they are all heat sink, and a couple hundred pounds), but most amps are out of class A after a couple of watts.
The saner solution is to buy the 8008X5 that is currently listed on A-gon. Doesn't use much more current than one 8008BB/ST, but split among the 5 channels that probably won't be too demanding anyway. A good compromise.