Is it correct that a solid state amp like the ALS-600
is safer to work on because once you have it
unplugged for awhile you don't have to worry about
massive capacitor build up of voltage that can
Do you have to chickenstick everything?
I would not chicken stick a tube amp unless the chicken stick had a proper resistor. Just dumping the B+ to ground can damage parts.
All of the Ameritron amps have suitable bleeders. If you unplug the amp and start taking screws out, by the time you have it open the HV will be down. In the rare case there is an open bleeder you should be able to see the HV stay up a bit on the HV metering. After the cover is off you can ground the HV through a suitable 50-500 ohm resistance with a metal composition or some other high joule capacity resistor. NEVER dump HV to ground with a dead short.
As for the ALS-600 specifically, it comes with two different supplies. A switcher than can have up to 300 volts dc in the switching supply, and a transformer type that only can have 50-60 volts dc after unplugged. Both reach zero volts on the output line in a few seconds so the amp itself is dead very quickly, although the switcher bleeds the 300 volts that is stored inside the power supply over several seconds.
With FET's the very last thing you want to do is go poking around with a shorting stick. That would be pretty dumb. The proper procedure would be to unplug and wait a few seconds and watch the HV disappear on the meter. If you see the HV meter go from operating voltage down to zero as you power it down while watching the meter, it will be safe.
I generally never crowbar anything that has a working HV meter. I watch the HV meter to be sure it is working, and wait for it to reach zero. Then I remove the cover and clip a 51 ohm 2 watt metal composition between HV and ground.
There can be a rare case where a bleeder is open, but it always shows on the working HV meter. The voltage will quickly sag to the voltage of one electrolytic (around 400-450 volts) or more and then park there for a LONG time without decreasing. If you ground the HV line with a 51 ohm high surge energy rated resistor, it will quickly sink to zero volts without blowing up semiconductors. Normally the amp would have a loud "popping" noise in operation if it had an open bleeder, so it is pretty obvious
If you just use a screwdriver you can pop semiconductors. That's true in both tube and solid state amps.