Question for Onkyo Amp owners
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bluescat
Well-Known Member
Thank you, Sir!!!
External Processor Switch. I own an A7090 since new over 30 years ago and it is a fine integrad. This switch routes the signal coming out of the pre to whatever is connected to the jacks in the back and back to the main amp. Back in the day, people connected mostly equalizers and some reverberation amps. When not depressed, the signal goes from the pre to the main internally. That is why you do not have jumpers in the back as some amps had at the time. If you send me a PM with you e-mail and I will be glad to scan the original owners manual and send it to you. Just give me a couple of days. Now. if you could get your hands in a pair of Onkyo SC90MKII which I also got with my 7090 you will be set. The problem is that they are practically non-existing. Not many were brought to the US and they were kind of expensive, $499 each. If you try a Goggle search for them all you get is a post here where I name what Onkyo gear I have, and a whole bunch of links in Germany and Italy. At the time, around 1980 Onkyo was very strong in Germany.
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bluescat
Well-Known Member
Thank you Sir, that really helps! If I wanted to connect another pre-amp, this is what I would use, correct??? I have found the service manual online, but have been unable to find the user manual. I will PM you, as suggested.
bowtie427ss
Lunatic Member
+1 to everything in this post.:yes:
One word of caution with these older Onk's, the faceplate lettering is nearly as delicate as that on vacuum tubes.
oblomov
Well-Known Member
Mmmm, not sure about that. Seems to me that if this works like a typical tape or EQ loop, you would then have two active pre-amps in the chain. Kind of wonky. And complicated and noisier.
To utilize another pre-amp and actually bypass the one existing in the Onkyo, you need the "pre-out" and "main in" (or vice versa?) connections, if not in use connected together with a jumper of some sort.
bluescat
Well-Known Member
Yea, this unit doesn't have pre in/out jumpers. After looking at the block diagram in the service manual, I can see that the eps is after the pre amp, so you would be correct about the conflict. What I was thinking about doing was using one of my Marantz receivers as a tuner, but the only way to do that is thru the pre out jumpers. I guess I'll just have to get my T4040 tuner fixed. Thanks for your input!!
Yes, if you want to use another pre-amp you have to connect all your sources to the new pre-amp and connect the new pre-amp out to the main-in in the 7090. To listen to the sources you would need to have the EPS switch on. That way will be using the outside pre-amp and the 7090's amp. You can also use the 7090's pre-amp and an outside amp. To do this you would have to connect all your sources to the 7090 and connect the 7090's pre-out to the outside amp's in, and all your speakers connected to the outside amp. Also depress the EPS switch. If you also want to have an equalizer, or any other sound processor, you can connect it between the pre-amp you are using and the amp. If you want to complicate things you can also have an outside pre and an outside amp conected to it and choose which ones to use, thanks to the EPS switch and not having jumpers in the back. This is a bit more complicated and if you are interested I can tell you how to do it. This is a very versatile integrad. Did you notice you can connect 3 phonos, 2 MM and 1 MC, 2 tape decks with monitoring for both and dubbing from tape 1 to tape 2 or from tape 2 to tape 1, 3 sets of speakers from 4 to 16 ohms, and 3 way adjustable power indicators. Very high power (it is underrated) and low THD and Intermodulation (which nobody is talking about these days but is very important I believe). As for the manual, I'll scan it tonight when I get home and send it to you. If not able to do it tonight I'll do it tomorow. The only thing left is that I hope you don't like it and even hate it. Then I'll be glad to get it off your hands.
It has pre-out, main-in, plus 2 of what is called tape loops, or tape monitors.
bluescat
Well-Known Member
Hi: Last things first, sorry I wouldn't think of parting with it! Other than having to de-oxit the switches periodically I have done nothing to it in the 3 or so years that I've owned it. It's kind of a shame that with all the features the 7090 has, I have so far only used the aux and phono inputs.
When you speak of the "main in on the 7090", are you refering to the EPS in? I don't see a main in as on my Marantz. I have a Yamaha that has a "main in" RCA input on the back with a switch on the front. I finally have all my units working and don't want to cause any problems with the 7090.
There is absolutely no hurry on the scans, and again I thank you for copying them for me!!
bluescat
Well-Known Member
I must be blind, I don't see the main in/pre out??? Right next to the tape in/out jacks are the EPSin/out jacks.
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They are there. Maybe, since these things are about 35 years old, the lettering is no longer readable, but you will be able to locate them once I send you the manual. Or maybe, like me, you need new glasses (just a joke). That's the beauty of EPS, you don't need jumper cables, or change cables for different options. Just push a button and you are done. Now, are you sure it is a 7090? It had 2 smaller brothers, the 7070 and the 7040, and I can't remember if they has the EPS switch and pre-out main-in jacks.
bluescat
Well-Known Member
It's an A7090, but it doesn't have main/pre in/out jacks labeled as such, just the EPS Jack's. Being an old guy, I double and tripple check things before I make a move. That's why I went back and quadruple checked and edited my last post. Yea, I'll be able to figure it out with the manual!
bluescat
Well-Known Member
Yep, that's them! I suspected we were talking about the same thing, just using differen't nomenclature! Glad we got that cleared up. Take care!!
Oh, yes, the lettering. When I bought my 7090 I also bought a T4090 tuner, TA2040 casette deck, AT5 timer and a pair of SC90MKII speakers. A couple of years ago I wanted to clean the front plates, and good thing I started with the tuner. I can't remember what I used, but it wasn't anything too strong, and when I wiped it the lettering was gone. No matter how dirty it is, wipe with a clean cloth, and if needed, just wet it lightly.
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