Installing Power Switch on Phase Linear 400 Power Amp

[scott2000]

Thanks! Is that the resistors? Is the one a thermistor?

 

[PRR]

> the first solid state amp i have seen with output transformers!
> kind of. they are auto transformers for impedance matching.

Mac's early tranny amps had iron output. (Not to mention many PA amps.)

This one (like Mac's) is actually to reduce voltage stress on older devices. Working into 2 Ohm load is half the voltage. You could get current in one device and big current with simple paralleling. You can stack to split voltage but there are more pitfalls and annoying details.

 

[moamps]

Is the actual switch in that photo really rated at 16 amps?

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If you click on the picture, you will see some numbers and letters on the body.

It sure doesn't look like a 16 amp switch to me.

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But even if it's rated

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(or claimed, depending on how much we trust the manufacturer)

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the construction looks very wimpy and I wouldn't use it for any sort of high power application

PL400  isn't  "high power" amp.

Most power amps use power switches with much more robust construction

You're plain wrong here. Most power amps use ordinary power switches and  some sort of inrush current limiters (NTCs,  high power resistors) and/or low power controlled chunky relays and solid state switches.

 

[moamps]

Thanks! Is that the resistors? Is the one a thermistor?

NTC R37 sg150
https://www.mouser.de/Circuit-Protection/Thermistors/Inrush-Current-Limiters/_/N-axfxj?P=1z0x8fvZ1z0x6umZ1yzxkbc

 

[David Kulka]

Or a relay.