73 - David, AG4F
I would have to say that overall the best 12vdc power supply value is an Astron liner supply, The 35M or 50M would be the best choice for the shack.
Although there are some very good Switching supply available none are as quiet across the HF/VHF/UHF spectrum as a Liner Power Supply.A few reasons to choose an Astron is that they have been in business for over 40 years and have great customer service and very simple clean design, Easy to service and most important No RF Hash!
And when you just spent thousand of dollars on a state of the art SDR the last thing you want is a power supply detracting from the radios performance.
I tried an MFJ-4245mv 45 amp supply someone suggested. Fan noise was very loud. Louder than the Power Genius XL amp. There are two fans inside that are 12 volt fans tied to the output of the supply. I run the output at 14.4 volts so the supply was screaming! A fix was a 51 Ohm 2 watt resistor in series with the red lead on each fan. Air flow still keeps it cool but barely audible. One ding against the amp is the binding posts for the 45 amp connection have caps that do not unscrew all the way. This makes it impossible to use ring lugs on the power cables.
Switching supplies ALL generate RFI somewhere. The better ones allow you to tune the RFI frequency out of the ham bands. But it’s still RFI and will get into something or beat against something. Better just not to have it. I think of Switching Supplies as giant Wall Warts.
The vibration started on day one, a small paper wedge in a strategic spot cured it on day two quiet ever since.
A couple years back I added a cheap Chinese 3 digit (blue) LED voltage readout outboard for my own peace of mind.
I bought an Astron 30SS about 15 years back for a backup, have never needed it.
Wouldn't you want to be able to operate when there is a power outage?
While you're at it, choose a car battery that also fits your car, and now you have a backup battery you can use in case your car's dies.
I should add that my 3 different Astron RM-50 Each Feed a PowerGate PG-40S to charge big AGM batteries. Then 12V DC Buses are on the battery side and the Astrons mainly acts as a charger for the batteries. Virtually eliminates any noise from the power supply and provides clean power to all my 12V devices.
I might add I also have a 5VDC Bus that feeds off one of the 12V DC Buses.