View Full Version : Mitsubishi DA-A10DC Stereo Power Amplifier


don20032004
01-17-2009, 10:10 PM
Anyone have any experience with Mitsubishi amps? Aesthetically speaking they look great to me, but how do they perform?:scratch2:

EchoWars
01-17-2009, 10:16 PM
Excellent performing, somewhat cheaply built IMHO.

Lain
01-18-2009, 02:51 AM
Hah, I bought one rather recently.

After a quick google, a copy/paste of the stats:

Power output: 100W continuous power per channel (8 ohms from 15Hz-30kHz, with 0.01% THD)
Total harmonic distortion: 0.005% at 50W per channel,
Intermodulation distortion: 0.008% at rated power, 8 ohms
(70Hz and 7kHz 4:1): 0.01% at 1W per channel, 8 ohms
Power bandwidth (IHF): 10Hz to 100kHz at 0.1% THD, 8 ohms
Frequency response: 0.1 dB from 20Hz to 20kHz at rated power,
Input sensitivity/impedance: 1V (variable)/50k ohms
Damping factor: 100 from 20Hz to 20kHz, 8 ohms
Channel separation: 100dBat 1kHz; 80dB at 20kHz
Hum and noise: 0.12mV (unweighted, closed circuit)
Signal to noise ratio:
107dB (unweighted, closed circuit)
122dB (IHF, A network, closed circuit);
118dB (DIN, closed circuit);
109dB (DIN, 47k ohms//250pF terminated)
Slew rate: 30V//iS at 50V peak to peak, 8 ohms
Power: 600W (IEC nominal); 390W at rated power, 8 ohms; 240W (UL nominal)
Dimensions (WxHxD): 425x170x285mm
Weight: 16kg

The design is basically two mono-blocks in the same box.

I am not sure what EchoWars is talking about when he states "somewhat cheaply built". From what I have seen on the insides it looks very well put together (a little snug however). My unit has some very small rusting lines on the outer parts and four broken heat-sink fins, so I can only assume that it was not taken care of or stored properly.
However, the insides look quite up to par, and has taken no damage in the least (it's a tank basically).

Post some pics when you get the time :D

don20032004
01-18-2009, 08:55 AM
"Hah, I bought one rather recently."

Soooooooooo it was you that I was battling on eboy! LOL

Ya, They do look like there built like a tank. Did you get the meters with yours? Do the broken heat sinks hurt the performance?

I know about the stats, How do they perform? Sound?

stereo_dog
01-18-2009, 09:04 AM
I have a DA-A15DC amp & meters. It sounds very good. It has always had plenty of power for my needs. The preamp and tuner are constructed of thinner metal than most vintage equip. Maybe that's what EW was referring to. I've also seen alot of the amps with one or two broken speaker posts.

thedelihaus
01-18-2009, 02:04 PM
I like them- but here's a little secret-

Those big power caps? Actually two smaller caps hidden under a larger "lid" made to look like one big cap.

I've heard this amp at my house (friend owns one) and it sounds really nice. Plenty of gusto for most applications...

don20032004
01-18-2009, 03:24 PM
That sounds like something I would be interested in. This web site is great for getting good honest information that you can use.

Brian
01-18-2009, 04:22 PM
If that is the one that you can plug a tuner or tuner preamp onto the front then there is a tuner for sale on the Toronto CL.

thedelihaus
01-18-2009, 04:52 PM
Brian,

Usually you mount a meter set in front of the amp- that meter set may be a pre-amp as well-I can't honestly recall.

But yes- these are modular, stackable, kinda like playing with hi-fi adult legos.

Very cool stuff.

don20032004
01-18-2009, 05:04 PM
Ya, they sell a seperate tuner and pre-amp. The meters attach to the face of the amp. Really cool stuff!

Brian
01-18-2009, 05:50 PM
Was not sure of the model # of the series but saw the tuner for sale last week in doing a search on the site. I do not fully the brand so was not sure.

There seeme to be some mixed reviews about the group but mostly favorable for the going prices. The power amp look impressive.

Lain
01-18-2009, 06:48 PM
"Hah, I bought one rather recently."

Soooooooooo it was you that I was battling on eboy! LOL

Ya, They do look like there built like a tank. Did you get the meters with yours? Do the broken heat sinks hurt the performance?

I know about the stats, How do they perform? Sound?

Nah I bought mine via Craigslist.
No meters with mine.
And no it hasn't effected the performance to my knowledge. Hell the sinks never get hot.

As for the sound, well I use it for home theatre, and I do not have a dictionary of audio abstractions, but I will report it provides a full sound. Lots of headroom (with my speakers at least).

I am having a problem with mine though. The speakers seem to cut out when the amp is powered to a certain db level. I think it might be the power caps, or another cap.
Not a "problem" with the amp per say, as the caps only have a limited life span.

I like them- but here's a little secret-

Those big power caps? Actually two smaller caps hidden under a larger "lid" made to look like one big cap.

Only half right.

It uses two caps in one cap (which is 10,000uf). A dual cap of sorts. It's not as big as the cover sure, but it is still a good size. One dual cap per channel.

In any case, I priced getting them replaced. It would involve 4 caps, and custom PCB board. About 170 for caps, shipping, and labor.
About how much I paid for the amp in the first place D:

xoaphexox
01-18-2009, 06:56 PM
I have owned and restored two of these DA-A10DC amps, along with the DA-M10 meters and a DA-P10 preamp.

I think they sound great and I would not hesitate to pick up more at a decent price.

To "echo" what echo said they are a bit cheaply built - the "bumper" fins on the back of one of mine cracked and boy are they a pain to clean if they get dusty! Getting between those heat fins is a royal pain.

The power amnp is very straightforward under the hood though, and easy to restore. The preamp not so much. A lot of dis assembly required.

xoaphexox
01-18-2009, 06:57 PM
In any case, I priced getting them replaced. It would involve 4 caps, and custom PCB board. About 170 for caps, shipping, and labor.


Do you have any more information about this? I am curious about the custom PCB as opposed to point-to-point wiring of two capacitors, kind of like LBPete did for his oval caps in a G-9000 or AU-919 (I forget)

Edit: not LBPete, CDfixer. Sorry.

Lain
01-18-2009, 07:04 PM
I contacted Curt June after reading this page on his website: http://www.geocities.com/cdkands/mrntz170DC/mntz170_4.html

Columbo
01-18-2009, 07:08 PM
I've got a DA-C20 and DA-A10DC that works, but has busted speaker terminals. A poor design, and old plastic. Does anyone know of a good update for this so I can run the thing and evaluate it better?

xoaphexox
01-18-2009, 07:10 PM
Actually now that you mention it I hate the speaker posts on the DA-A10DC. I have seen one sell on eBay recently in which the owner 'upgraded' to spade jacks. I haven't changed them out.

magmod93
01-18-2009, 07:45 PM
Someone left a DA-A10DC on the front steps of my shop a few years ago, along with other stuff including a Teac reel to reel.

Abandoned.... So I took it in.
After some cleaning, a few new caps, and balancing the voltages, it cranked!
Excellent power, stability, and clean sound! And the sucker weighs like 37 pounds! A real tank!
I used it for a few years until I found the love of my life, my Maggie 9304-20(see tube amp threads)
Now the Misubishi sits, alone, on a shelf in my basement. Trust me, it's a great amp, but I love that tube sound better.
See how us men are?.... we'll dump your ass for something else!

Lain
01-18-2009, 07:55 PM
Now the Misubishi sits, alone, on a shelf in my basement. Trust me, it's a great amp, but I love that tube sound better.
See how us men are?.... we'll dump your ass for something else!

...

You are quite the scoundrel yes?
Leaving a restored amp of that caliber alone in a basement D:

don20032004
01-18-2009, 07:57 PM
Someone left a DA-A10DC on the front steps of my shop a few years ago, along with other stuff including a Teac reel to reel.

Abandoned.... So I took it in.
After some cleaning, a few new caps, and balancing the voltages, it cranked!
Excellent power, stability, and clean sound! And the sucker weighs like 37 pounds! A real tank!
I used it for a few years until I found the love of my life, my Maggie 9304-20(see tube amp threads)
Now the Misubishi sits, alone, on a shelf in my basement. Trust me, it's a great amp, but I love that tube sound better.
See how us men are?.... we'll dump your ass for something else!

Totally understand the dumping for something else,but Maggie's out of my price range!:tears:

don20032004
01-18-2009, 07:59 PM
I contacted Curt June after reading this page on his website: http://www.geocities.com/cdkands/mrntz170DC/mntz170_4.html

Looks like nice work!

magmod93
01-18-2009, 09:05 PM
Totally understand the dumping for something else,but Maggie's out of my price range!:tears:

Oh?...... didn't I tell you?
The Maggie was handed to me for FREE too, right out of the back of a 1962 console Magnavox. Tee Hee Hee! :music:
A few tubes and caps and mods...... voila! Tis LOVE!:banana:

thedelihaus
01-19-2009, 05:12 AM
...Only half right.

It uses two 10,000uf caps in one cap. A dual cap of sorts. It's not as big as the cover sure, but it is still a good size. One dual cap per channel...


I think I got it correct- I stated two caps- and that breaks down to twin smaller caps inside the larger cap- and being stereo, that would be four total- two inside each large cap- and two of those "large" caps.

Correct?

I don't know much about the boards- could it be something straightforward to rig up? Or is there some sort of proprietary schematic/application involved?

Mitsubishi is not the only one to use this "dress-up". I have seen "oval" (actually elongated "0" shaped) caps that hide two round caps underneath.

Sansui used "0" shaped caps in the 719 or 919 or one of their models- I can't recall exactly- I wonder if this was also a cap "dress-up" or in fact an odd-shaped (singular) cap.... (???)

EchoWars
01-19-2009, 06:40 AM
919 and G-9000.

thedelihaus
01-19-2009, 06:47 AM
Thank you Glen.

But is it a proprietary "0" shaped cap, or two standard style cylindrical caps dressed in an "0" shaped "disquise", for lack of better wording?

don20032004
01-19-2009, 08:57 AM
Oh?...... didn't I tell you?
The Maggie was handed to me for FREE too, right out of the back of a 1962 console Magnavox. Tee Hee Hee! :music:
A few tubes and caps and mods...... voila! Tis LOVE!:banana:

Got any more free stuff? I can take it off your hands!:deal:

Lain
01-19-2009, 11:31 AM
I think I got it correct- I stated two caps- and that breaks down to twin smaller caps inside the larger cap- and being stereo, that would be four total- two inside each large cap- and two of those "large" caps.

Correct?

Ah right you were correct. I guess I misunderstood what you were getting at.

TOO LOUD???
01-19-2009, 11:38 AM
I have one and use it on a daily basis, I like it a lot, although I'm always on the lookout for something else to play with. When I find another amp I like I'm gonna pull this one out and go through it I think it could use a good recap and tune up, kinda lacking on the top end.

magmod93
01-19-2009, 12:10 PM
Unless there's hum and the +/- volts are off by more then a volt, I'd suggest swinging out the main board and going for the caps on it. Stick to the original values. Check for any ring-joints on the board. And also, those bias pots/input level pots get dirty/unstable. Replace them. But have the Service Manual handy to set bias/balance properly. The speaker/relay switch also gets corrosion.

EchoWars
01-19-2009, 06:42 PM
Thank you Glen.

But is it a proprietary "0" shaped cap, or two standard style cylindrical caps dressed in an "0" shaped "disquise", for lack of better wording?CD Fixer took one apart, with pics. Search (http://www.audiokarma.org/forums/search.php)...

autoteck1
01-24-2009, 10:30 AM
looking for service manual for mitsubishi da-a15 or da-a10, allso da-a15dc

totem
01-24-2009, 10:51 AM
thedelihaus
Mitsubishi is not the only one to use this "dress-up". I have seen "oval" (actually elongated "0" shaped) caps that hide two round caps underneath.

Open up some of the off shore tube gear covers, and you find nothing.

autoteck1
01-24-2009, 02:09 PM
Anyone have a copy of a service manual for the da-a10 or da-a15,, or da a10dc
that they could send e-mail ???
Jim

autoteck1
01-24-2009, 02:53 PM
Mitsubishi audio components are known in europe as "Diatone", from what i could find out they are still making the da-a10dc, but can't find anything on Mitsubishi websight.

gary7
02-02-2009, 09:57 PM
I am having a problem with mine though. The speakers seem to cut out when the amp is powered to a certain db level. I think it might be the power caps, or another cap.
Not a "problem" with the amp per say, as the caps only have a limited life span. D:
I recently acquired a Mitsubishi DA-A15DC (rated 150 WPC) amp & meter set & DA-C20 Preamp/tuner. The C20 Is definitely the weak link. The case is narrower than more common audio components & very crowded inside. My C20 also has a problem in that it keeps cutting out the right channel when I first switch it on. I have to switch the speaker buttons off & on several times to get the right channel to stay playing. I tried Deox spray, but it did not help. They are nice units, however. Very retro seventies. The tuner dial is very cool, although a pain to tune when stations are at opposite ends of the dial. They sound very pleasing though.

sloop
11-13-2010, 03:57 AM
looking for service manual for mitsubishi da-a15 or da-a10, allso da-a15dc

it is free here:

http://www.eserviceinfo.com/downloadsm/48784/Mitsubishi_DAA10DC,%20DAA15DC.html

Montycat
11-16-2010, 12:55 AM
it is free here:

http://www.eserviceinfo.com/downloadsm/48784/Mitsubishi_DAA10DC,%20DAA15DC.html

Hi Sloop,

You have resurrected an 18 month old topic...but thanks for the link as it might help with a Mitsubishi DA R25 I have that has a short or something causing the protection relay to trip.

Mid-Fi
12-18-2011, 08:05 AM
I woke up one morning to see sparks literally dripping out of the bottom of my amp. After I finished watching the light show (coffee was still brewing) I quickly killed to power. The right side main power cap had given up and spilled lytic juice down on the main board causing sparks and a bit of damage but not much.

Bob Booker is a friend of mine and came by for dinner and to help me out. The big caps are under decorative plastic lids and are dual section 10000 mfd 63v Nichicons that are secured with a steel bracket and some sticky foam that had turned to goo years ago. Bob changed out 2 caps per side with ones of the same rating that measure 1.2" dia. and 2.5" high. He strapped 1 + and - terminal from each cap together and connected the remaining + and - back to the rails. Essentially re-soldering the wires back into their original positions. Bob also moved rail wires from their original spots on the board as the traces were lifting because of the lytic juice. They got re-soldered directly to the rectifier. I then used black RTV to secure the caps inside the cosmetic cans and put it back together.


http://www.audiokarma.org/forums/attachment.php?attachmentid=317906&stc=1&d=1324216840

http://www.audiokarma.org/forums/attachment.php?attachmentid=317907&stc=1&d=1324216840


So you do not need to buy expensive boutique caps on special boards to do your rebuilds. What I learned is that modern caps are typically much smaller and may even fit inside cans from trashed caps in our older equipment.

By the way, the service manual from HFE is in Danish and I need to re-bias this amp. Anyone read Danish? :D