Advice needed

[rosco]

I recently picked up an older Mitsubishi DA-R25 to power 2 pairs of speakers for my home video system, (i.e.) tv set dvd player, ect.

My question is whats the best input to use to hook all these things up.

It has various inputs such as phono,tape deck, aux, including preamp in and out.

My biggest concern is to not cause damage to this unit.

Any advice is appreciated.

Rosco

 

[TLS Guy]

I recently picked up an older Mitsubishi DA-R25 to power 2 pairs of speakers for my home video system, (i.e.) tv set dvd player, ect.

My question is whats the best input to use to hook all these things up.

It has various inputs such as phono,tape deck, aux, including preamp in and out.

My biggest concern is to not cause damage to this unit.

Any advice is appreciated.

Rosco

Your only line inputs are aux and tape. They are the only ones you can use. The phono will be a high gain RIAA equalized input for turntables.

 

[rosco]

advice

What are the preamp in and outs for?

 

[Adam]

First, I'd like to welcome you to the forum, Rosco!

I would think that the preamp inputs would act like an aux input, but perhaps they bypass any of the tone controls? I'll wait and see what TLS says on the matter - he knows about those older receivers, and I couldn't find much info on that unit. Preamp outputs would just send an audio signal to an external amplifier, which would in turn be used to power your speakers.

If you would attach a photo that shows the inputs/outputs, that would help out (at least, would help me out).

You say that you want to drive two pairs of speakers with this receiver. Most receivers of that vintage that I'm familiar with can only send the same signal to both pairs. Maybe yours can send two different signals, but I wanted to mention it.

Adam

 

[rosco]

another problem

I cant find jack about this unit.

Another vintage audio site which will remain nameless has yet to send an email to activate my account.... AK ..hint hint.

I guess they have more folks that deal with vintage units like this, and every search ive done comes up null on specs or documents for this receiver.

However I appreciate all the input ive been getting here thus far.

If anyone has had this receiver or can come up some info on it, I'd love to see it.

Thanks to anyone who contributes to my cause.

Rosco (a.k.a Mike)

 

[TLS Guy]

First, I'd like to welcome you to the forum, Rosco!

I would think that the preamp inputs would act like an aux input, but perhaps they bypass any of the tone controls? I'll wait and see what TLS says on the matter - he knows about those older receivers, and I couldn't find much info on that unit. Preamp outputs would just send an audio signal to an external amplifier, which would in turn be used to power your speakers.

If you would attach a photo that shows the inputs/outputs, that would help out (at least, would help me out).

You say that you want to drive two pairs of speakers with this receiver. Most receivers of that vintage that I'm familiar with can only send the same signal to both pairs. Maybe yours can send two different signals, but I wanted to mention it.

Adam

Yes, the pre out is the feed from the pre amp section. The pre in gives access to the power amps bypassing the controls. To get any sound out these have to be jumped (connected).

The pre outs could be connected to external power amps, and then only the radio and control functions of your unit would be operative. On the other hand, if you had an external pre amp and connected to the pre ins, your radio and control function would be inoperative, but the power amps of your unit would be operative driving the speakers, and control would be from the external unit.

I assume you are going to use the units control, radio and amp functions. In that case pre ins and outs must be jumped, or you will have no sound. The only inputs you can use are the tape and aux. Make sure you do not have the tape monitor loop engaged otherwise you will only get signal from the tape input.

 

[rosco]

This receiver is a bit older than the one I currently own.
http://cgi.ebay.com/Vintage-Mitsubishi-DA-R20-Stereo-Tuner-Reciever-AS-IS_W0QQitemZ190245962875QQihZ009QQcategoryZ50596QQrdZ1QQssPageNameZWD4VQQcmdZViewItem

All the ins and outs are the same, however the front is digital and has a few push puttons and less knobs.

I also have a Pioneer 950 and it has a pair of small bridges that connect the power in to the pre out.
Is this anything I could use with this receiver?

 

[TLS Guy]

This receiver is a bit older than the one I currently own.
http://cgi.ebay.com/Vintage-Mitsubishi-DA-R20-Stereo-Tuner-Reciever-AS-IS_W0QQitemZ190245962875QQihZ009QQcategoryZ50596QQrdZ1QQssPageNameZWD4VQQcmdZViewItem

All the ins and outs are the same, however the front is digital and has a few push puttons and less knobs.

I also have a Pioneer 950 and it has a pair of small bridges that connect the power in to the pre out.
Is this anything I could use with this receiver?

Those bridges are the jumpers, that connect the pre amps outputs to the power amps. If yours is missing them, you can use a short stereo audio RCA to RCA cable instead.

One other thing. The A & B speaker outputs will output the same signal. Make sure if you play both at once, both sets of speakers are 8 Ohms. If you do play both keep the volume down. With two sets of 8 ohm speakers each amp will see 4 ohms. Those old receivers do not like being pushed hard into four ohm loads, and nor do a lot of new ones. If you go below four ohms you will blow it. There is no protection mode on those old receivers, they just blow. The best advice was always to play A or B speakers but not both, and that is still good advice.

 

[Adam]

Mike,

You can power two pairs of speakers with it, but they will output the same audio. In other words, if you are trying to do surround sound, the rear speakers would be playing the same thing as the front speakers.

If the inputs are identical, then you can hook up three components that are not a turntable into the following inputs: (1) AUX, (2) TAPE1 PLAY1, and (3) TAPE2 PLAY2. Like TLS said, the phono input has a different (higher) level of amplification performed on the input signal, so you don't want to plug anything but a turntable into the phono input. If you did, the result would be that the sound coming out would be really loud.

So, you could hook up anything that has the two-channel left/right RCA analog outputs to this, such as your TV and DVD player.

As for using the Pioneer 950 bridges, I would expect that those would work as long as they fit between the PREOUT and MAIN IN jacks. Otherwise, I would think that any cable would work as a connection. If I understand TLS correctly, you just need those jacks to be electrically connected - which you could do with any cables with RCA jacks on the ends. The bridge connectors are probably just more handy because they are compact. I'm sure that I'll be corrected if that's wrong.

Adam

EDIT: I took too long to type. I see that TLS has already given an answer on the jumpers, which (lucky for me) agreed with mine.

 

[rosco]

Yet another question...sorry I dont want bad things to happen to ths new receiver that hapened to my Pioneer.

If I'm connecting a tv or and ipod to the aux or tape input, and the tv or ipod has its own volume control, will turning the volume up on either one end up harming this receiver?

 

[Adam]

That shouldn't hurt it. I'd recommend that you start with the volume on the receiver turned down, and then adjust the volume on the TV or iPod to see just how loud it makes things...then increase the volume on the receiver to where you want it. After the first few times, you'll know a good place to set the volumes on each. Except for possible distortion of the signal caused by the output amplifiers in the TV or the iPod (which shouldn't be noticeable unless you crank the volume up on the TV or iPod), changing the volume on those components shouldn't do anything bad at all to the receiver. I have my TV hooked up to my receiver, and I change the volume using the control on the TV all the time.

 

[rosco]

with that said

Those bridges are the jumpers, that connect the pre amps outputs to the power amps. If yours is missing them, you can use a short stereo audio RCA to RCA cable instead.

One other thing. The A & B speaker outputs will output the same signal. Make sure if you play both at once, both sets of speakers are 8 Ohms. If you do play both keep the volume down. With two sets of 8 ohm speakers each amp will see 4 ohms. Those old receivers do not like being pushed hard into four ohm loads, and nor do a lot of new ones. If you go below four ohms you will blow it. There is no protection mode on those old receivers, they just blow. The best advice was always to play A or B speakers but not both, and that is still good advice.

The pair of 4 ohm bose 101s and the pair of 6 ohm sony ss j50s will do some harm over time and I should get different speakers if I plan to run two sets.

 

[rosco]

Thanks to everyone for putting up with all my questions.

Mike

 

[Adam]

Thanks to everyone for putting up with all my questions.

Mike

Hey, Mike, we're happy to try and help! Feel free to ask as many questions as you like. It was nice to do some searching and see some pictures of those older receivers. They remind me of when I was younger.

 

[rosco]

Price for this unit?

This receiver is in great shape and fully functional.

Any idea what it may be worth?

Rosco