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Reviews Categories | Power Supplies | MFJ-4035MV Help

Reviews Summary for MFJ-4035MV
MFJ-4035MV Reviews: 52 Average rating: 3.4/5 MSRP: $150.
Description: 35 Amp Adjustable Power Supply
Product is in production.
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K2LCN Rating: 4/5 Feb 17, 2014 10:29 Send this review to a friend
K2LCN  Time owned: more than 12 months
I recently overhauled my MFJ 4035mv. All the parts have NTE replacements. The circuits use op amps to control the supply. Wires on the circuit board are long enough to allow troubleshooting. I rate it number one for servicability.
KD5OM Rating: 1/5 May 17, 2013 12:12 Send this review to a friend
Piece of Crappolla  Time owned: 0 to 3 months
Right of the bat, the 35 amp terminals were never tightened down. Both post wiggled right out of the box brand new. Good thing I know how to use a wrench. Maybe Marvin needs to have a class over there in the proper use of tools. And yepper, my fan is LOUD too. I guess I'm going to have to do the series resistor n=modification to quieten it down. It is a sad state when you get home with a new item and I have to do bench repairs before the new smell wears off. Oh I agree, a 3 prong plug with a ground lug might have cost Mr. Jung a few more cents but it would have really been nice to have it electrically grounded.
KD6ET Rating: 5/5 Oct 12, 2012 10:57 Send this review to a friend
Works as described - low fan noise  Time owned: 0 to 3 months
I bought this one because it had a full size transformer rated way beyond any demand I had. I don't understand why it's listed as a switching supply (type-o maybe?). I have a switcher rated at 30 amps and I think I hear some noise from it on receive but nothing using the 4035. It contains a full wave bridge rectifier and an 18 pound transformer followed by extensive regulation equipment. This one meets the old time standard for a quality DC supply I'm used to and glad to see this type is still available but, getting a little hard to find. It's weight is no problem since it will set on the table end or floor. I do not understand the fan noise comments. Unless mine is different, the only time I hear it is when the radio audio is turned all the way down, otherwise it's a lot quieter than the base level radio audio. I'm use to full limit linears and yes they're too noise for in-shack use on SSB. Mine goes up in the attic near the antenna.
W4KVW Rating: 4/5 Aug 26, 2012 11:18 Send this review to a friend
Pretty good supply  Time owned: more than 12 months
I use this supply as my backup supply,test supply & too run my 6 meter FM rig.It works just fine but the fan is pretty loud & never turns off.I cut the power wire for the fan & am planning on adding a variable speed control since it stays pretty cool anyway & does NOT need the fan most of the time.I think it should have a temp setting like my ASTRON RS-70M but it does not.It was FREE so I am not complaining.May add some lights to the meters as well in the future for my OLD eyes! {:>)
K5YZS Rating: 4/5 May 2, 2012 08:07 Send this review to a friend
OK for me  Time owned: more than 12 months
I have owned the MFJ-4035MV for over 4 years and
the only troule was the noisy fan. I put a resistor in series with the fan positive lead and
reduced the noise quite a bit. Big and heavy and
no problems supplying my ICOM-756 and a couple of
other low current needs. I would have given it a
5 rating, if not for the fan noise.
73 Jim, retired engineer, K5YZS
W5WS Rating: 2/5 Mar 2, 2012 17:51 Send this review to a friend
LOUD!  Time owned: 0 to 3 months
This one is going right back to the dealer. The fans are too loud even when using headphones. The other issue is using a 2 wire power cord and not providing a grounding stud. How hard would it have been to use a 3 prong plug or providing an easy way to ground the case. Poor design and execution.
KB3FTE Rating: 3/5 Dec 16, 2011 15:24 Send this review to a friend
Noisy, but otherwise OK.  Time owned: more than 12 months
I purchased this power supply at the end of 2000 and have used it for the last 11 years (moderate to heavy use for the first 2 years and last 3 years, very light use in between.) The fan has always been very noisy.
This past year the supply started periodically making a loud buzzing sound not related to the fan. Powering off and on would stop that noise. When the supply starting providing inconsistent voltage several weeks ago I stopped using it and ordered a supply from a different manufacturer. This MFJ was not bad for the money, however, if I had to make the choice again I would spend a bit more and get a better made, quieter power supply.
KG4GYS Rating: 1/5 Nov 24, 2011 15:28 Send this review to a friend
Bad  Time owned: 6 to 12 months
>Wish I wouldn't have bought it. The cooling fan is too loud. I can't put the power supply on my desk because it is so loud. This makes the large meters irrelevant because I can't see them when the PS is under my desk. Even then, the PS is still too loud. MFJ sent me a replacement fan. It's just as loud. It was also hard to replace. The first turn of an allen wrench stripped two of the mounting screws.
AK4BL Rating: 1/5 Aug 22, 2011 12:23 Send this review to a friend
My last purchase from MFJ  Time owned: 6 to 12 months
My MFJ coffee cup works as advertised. Can't say that for this power supply.

I opened the box up and was surprised to see a two-prong power cord.

Opened the unit up to add a 3-prong cord. Found many cold solder joints. The internal mechanical layout was not professional.

Noisy with even a light load.
WA8JXM Rating: 0/5 Jun 29, 2011 14:04 Send this review to a friend
Way too noisy!  Time owned: 0 to 3 months
Seems like a good solid power supply with nice connection long as you can put it in another room! The fan noise, even just running 20 watts, is unbearable even while wearing headphones.

I called MFJ support about the noise and he admitted that their catalog claim about "whisper quiet" was "somewhat misleading".

I have replaced it with an Astron RS-35M which IS quiet!
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