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Reviews Categories | Amplifiers: RF Power - HF & HF+6M | Dentron MLA 2500B Help

Reviews Summary for Dentron MLA 2500B
Dentron MLA 2500B Reviews: 29 Average rating: 4.8/5 MSRP: $1200.00
Description: 2 KW PEP Amp 160 80 40 20 15 10 m
Product is not in production.
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JUNKMAN Rating: 5/5 Feb 20, 2011 03:36 Send this review to a friend
Worth every penny  Time owned: more than 12 months
I've owned several of these amps over the past few years and I just acquired another one last week. This one is the MLA-2500 non B model and is in like new condition inside and out. Even the tubes still look new. 50 watts will produce about 1100 out and 80 watts will produce 1500 watts out. A full 100 watts in will get you 1800+ out! I just ordered the soft start kit from Harbach to make it easier on the tubes at start-up. Considering the ever increasing prices of the new amps these older amps are looking better and better. A simple upgrade to the power supply board with new caps and diodes is all that is needed to make these amps last for many more years of service. I know of no new amps that cost less than $600 and puts out 1500+ watts to the antenna. In my opinion these are a smart buy and worth every penny that they cost now.
N4EDX Rating: 5/5 Dec 30, 2009 19:03 Send this review to a friend
Great service  Time owned: more than 12 months
I bought one at the Asheville, NC (Waynesville NC)Hamfest from a private owner, it was a great buy. It has provided a couple years service with no problems. I know the tubes are original but its been a well cared for unit. 1800 out on 80 meters down to 1200 on 10 meters. Best purchase I've made at a hamfest!
Ed (N4EDX)
KG8DP Rating: 5/5 Feb 13, 2009 07:29 Send this review to a friend
Great Amp.  Time owned: more than 12 months
For a number of reasons I made swing from Commander amps back to the Dentron. I now within 2 months own 2 of them plus a WP-1 watt meter and MT-3000A. match a 2500 and a 3000a and load up the box spring in your mattress just dont lay on it. LOL. To top it off, i have found 2 people that work on the stuff locally. One of the dentrons I purchased I sold to a guy back in the arly 90's and he did not use it anymore. thats why I marked it longer than 12 months. they are on e-bay all the time. good amp and good buy beats paying thousands for the 1.5 kw amps. Mark
ZL4TGH Rating: 5/5 Jan 5, 2009 00:52 Send this review to a friend
Bang for the bucks  Time owned: more than 12 months
15 years ago I swapped a TNC for the non-working amp. It came with 2 new valves and the originals also like new. A quick tweak on the voltage relay (about 5 minutes work) and in business. Put it in storage for 5 years and when I turned it on, bang! HT cap blew. Well tonight I replaced them all and with extra 0.01uF across them and 10 ohm on the HV B+ in case of arcing. Removed my GLA-1000B and put my sweetheart back in line. First contact with the repaired amp, over the south pole long path to Germany on 40! The guy was so excited it gave me a buzz also. Other ZL4's tried but he just could not hear them. My FT-2000D was only putting out 30w. What a great amp, before it's time.
KA9TZU Rating: 5/5 Nov 21, 2008 18:56 Send this review to a friend
Best amp I have owned  Time owned: more than 12 months
An extra class friend of mine bought this amp new in the mid 80's. I always thought is was great. When he moved he sold it to me for a song.

It sat on my shelf for over 5 years before I used it. Worked like a charm even though the caps arced now and then. The problem stopped on it's own, so I never replaced them. Put it away when I moved a year later and brought it back out 12 years later. Still worked great.

I have 2 sets of 8875 tubes I had bought back then in case I needed them. Not so far, originals are still at full power. I can easily get 1400 pep on 80 meters with a 40-50 watt drive. The swamping resistor is still in place. I have used this amp with numerous radios and it always has preformed for me. I am currently using it with an Yeasu 897D

I am converting a solid state medical research amp for amateur radio use. The amplifier uses 16 MRF150 MOS FETs in 8 push-pull output stages, which are driven by a push-pull stage using two additional MRF150s. Even when this amp is up and running, I will never part with my Dentron!!!!
W5VIN Rating: 5/5 Mar 11, 2008 10:48 Send this review to a friend
Retube  Time owned: more than 12 months
I just finished doing a retube on this great amplifier using the GI7B Russian triodes and W4ZT sockets. It will crank out well in excess of 1300 watts of power with less than 100 watts of drive power. To those that have this amplifier and it's tubes are going south this is a working modification that is not all that hard to do. It gives the MLA-2500 amplifier a new lease on life.
Charlie W5VIN
WA4RVB Rating: 4/5 Jan 28, 2008 07:50 Send this review to a friend
STILL GOING STRONG  Time owned: more than 12 months
AH6RR Rating: 5/5 Jun 9, 2007 20:02 Send this review to a friend
Rock Solid Amp  Time owned: more than 12 months
I bought my MLA-2500 at a local swapmeet for $85.00 it had 1 bad tube and the power supply had 2 bad filter caps and some blown diodes in the doubler. Well I could not find a 8875 that I could afford so I sold the good tube and bought 4 GI-7B tubes and all the parts I needed for the conversion plus a New Kenwood TM-271. So 2 months later and a little tweeking hear and there I now have an excellent amp with anywhere between 1300 and 1500 watts out with 2 of the GI-7B tubes. Great Amp.
W5VIN Rating: 5/5 May 19, 2007 18:42 Send this review to a friend
MLA-2500 Retube  Time owned: 0 to 3 months
I purchased a Dentron MLA-2500 with bad tubes. I replaced them with three 4CX-250B operating in modified grounded grid with screen and grid bias voltages. Both grids are at RF ground through coupling capacitors. I sort of followed the old QST article which used a Russian GU74-B. It was my initial choice but produced a less than stellar output. I redid the bias supplies using an LM431 and series zener for the negative bias. The screen bias uses an LR8N3-G high voltage regulator feeding a high voltage MOS transistor. For input matching I use an LDG 100Z Ultra externally between the antenna switching relay and the tube cathodes. It simplified impedance matching and is battery powered with memories. The amplifier will load to 1200 watts output and is quite comfortable at 1 KW out. There are several mistakes in the QST retube article article both in design and on the schematic.
Charlie W5VIN
AA8X Rating: 5/5 Feb 28, 2007 08:48 Send this review to a friend
30 years and still going strong!  Time owned: more than 12 months
Back in 1978, while living in Ohio, I purchased a new MLA-2500 from AES and for 30 years I have been very happy with this amplifier. This is an incredible amp and came with outstanding support from the staff of Denny Had, owner of the Dentron Company in Twinsburg, OH.

After having the original unit for a few months, Denton introduced the MLA-2500B that was an improved version. I called Dentron regarding the changes and they said to drop it off (I lived in the area) and they would update the unit to the full B version. This was a major undertaking, they replaced the power transformer to a new design that provided a tapped secondary winding for the high voltage, which would provide consistent efficiency at both the 1KW and 2KW power levels. They also replaced the 6 electrolytic capacitors to insure improved reliability as well as other minor upgrades. Although the front panel is original and still says MLA-2500, the factory added a labeled metal plate over the 5 push buttons to indicate the switches provide a different function on the B version.

Dentron completed the total upgrade and improvements at No Charge to me. Now that was a company that valued their customers. Too bad Icom wouldn’t do the same for the first 706 users. The American companies were still the best in providing support for their products.

My 30-year-old rig still has the original 8875 tubes and they still put out the legal limit. 3 years ago I replaced the 6 capacitors to insure continued reliability. I ordered replacement 100mf at 500-volt capacitors from Digi-Key and they are about the size of my thumb, very small compared to the original tall metal can ones that came with the amp. They were so small I had to mount them on a fiberglass pc board mounted to the chassis of the amp. I have never done any other modifications or other changes to the amp.

Too bad Dentron is no longer in business as they were a company that provided a first-class product with outstanding service and support.

This is a workhorse amplifier and should you have an opportunity to acquire one; I suggest you don’t hesitate to add one to your station.
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