MFJ-4275MV 75 Amps Switching Power Supply Review

[cobranut]

Does anyone know where the internal voltage adjustment is on the MFJ-4275MW power supply? The voltage on mine is a bit low at 13.2 volts at the detent setting. When I put about 45 amp load the voltage drops to 12.9 to 13.volts.

 

[hotrod]

you shoukld have a external adjustment just turn it up to
14-14.5 volts. i gotta jetstream 75 amp same as mfj .that what i do

 

[Moleculo]

It's not that unusual for a little voltage drop on these supplies when under load. It's not ideal, but it doesn't hurt anything.

 

[RatsoW8]

Jetstream offers a product that looks essentially identical to this one.

Except for the power poles on the MFJ they look identical. More electronic industry mass production.

 

[Moleculo]

An update on this power supply: It's developed a strange problem where the output voltage is completely random and is dropping voltage pretty too much under load. It's become particularly annoying: one day the voltage output will be 15 volts; the next day it will be 12v without adjusting anything and without a change in load. I'm going to start moving stuff over the MegaWatt supplies and use this supply as a general garage unit.

 

[hotrod]

my jetstreame is doing similar . when i turn it on it reads differently than last time i used it. but when under load it doesnt move . those mega supplies i know nothing about other than pics on web. but got lotta quedtions
1/wheres power cord connection at for 110v
2/wheres power poles for hooking up devices to it

 

[Moleculo]

those mega supplies i know nothing about other than pics on web. but got lotta quedtions
1/wheres power cord connection at for 110v
2/wheres power poles for hooking up devices to it

Here's a thread about them: http://www.worldwidedx.com/threads/...amp-switching-power-supply-comparison.182976/

Or feel free to start a new thread. The owner of MegaWatt is a member here and will be happy to respond to questions

 

[Megawatt]

my jetstreame is doing similar . when i turn it on it reads differently than last time i used it. but when under load it doesnt move . those mega supplies i know nothing about other than pics on web. but got lotta quedtions
1/wheres power cord connection at for 110v
2/wheres power poles for hooking up devices to it

There is good information on this site about the Megawatts and you can do a Google search as well or start a thread.

 

[Robalo]

on my the current meter stop working any one know the fix please or should i get new power supply. 73's