View Full Version : onkyo A-7090 vs onkyo A-10:nudies & impressions


gullaz
04-10-2007, 04:00 PM
I have recently acquired two big Onkyos from the mid/late 70s. The 7090 was the first to arrive. It's rated at 110 Wpc into 8 ohms with 0.018 thd.
The power supply is impressive with two massive transformers and 4x 15000 uF
caps.

gullaz
04-10-2007, 04:17 PM
The A-10 is a quite different beast; 85 wpc with higer thd (0.08). Also the power supply is different: it has dual transformers but only 2x 13000 uF capacitors.

zenith2134
04-10-2007, 04:20 PM
My impression is that any Onkyo from those years sounds excellent, especially considering the dual-mono and tone defeat options. I love my A-5 (45wpc @ 8 ohm 20-20k) and would think the A-10 is a killer amp. Congrats on your scores!

Personally, I would think the A-10 would have the better build quality considering its a tad bit older, but 7090 is very impressive.

IMO the higher THD on the A-10 is acceptable because it may use less negative feedback to reduce the distortion figures further. It may even sound better, but thats arguable. In any case, with those Hitachi output devices and the solid all-metal chassis, its no slouch. Both are beautiful Good luck, man!

gullaz
04-10-2007, 04:37 PM
The two amplifiers use different power transistors: A-7090 uses 4 couples of toshiba transistors 2sd551/2sb881; the A-10 4 couples of hitachi 2sd675/2sb655. Another difference is that the 7090 is servo-operated (not sure what this means, must be a sort of auto adjusting of bias voltage) while the A-10 is not.

gullaz
04-10-2007, 04:47 PM
My impression is that any Onkyo from those years sounds excellent, especially considering the dual-mono and tone defeat options. I love my A-5 (45wpc @ 8 ohm 20-20k) and would think the A-10 is a killer amp. Congrats on your scores!

Personally, I would think the A-10 would have the better build quality considering its a tad bit older, but 7090 is very impressive.

IMO the higher THD on the A-10 is acceptable because it may use less negative feedback to reduce the distortion figures further. It may even sound better, but thats arguable. In any case, with those Hitachi output devices and the solid all-metal chassis, its no slouch. Both are beautiful Good luck, man!

I was about to post my first impression on how they sound and I must (surprisingly) admit that I quite prefer the A-10 to the A-7090:I find it much warmer and smoother very open in the mid high but not lacking in the bass frequency. The 7090 is a real powerhouse with Very powerful bass performance (even too much imho, the kind of bass you'd call a punch in the stomach) but a bit too analitic and cold for my tastes.

zenith2134
04-10-2007, 04:48 PM
servo may refer to the biasing as you noted. I would prefer less automatic circuits for a minimalist/sound quality perspective

SoCal Sam
04-10-2007, 05:57 PM
Congrats on your Oinkers, they sure look nice. I like the power reserves dual trannies give.

bully
04-10-2007, 10:49 PM
I have had quite a number of Onkyo amps and receivers and I think they are some great gear.
From your description of the sound you hear, I think I might prefer the A-7090.

chicks
05-29-2011, 12:12 AM
The A-10 is a quite different beast; 85 wpc with higer thd (0.08). Also the power supply is different: it has dual transformers but only 2x 13000 uF capacitors.

A very old thread, but had to correct this inaccuracy. Just spotted one locally, and looked at the SM on hi-fi engine. There are actually two dual 13000 uF caps, which will be impossible to source, much like the ones in the Marantz 170DC (and probably others). Replacing them would require four 13000 uF (or thereabouts) caps and mods to the chassis to fit them in. I'm staying far away from the local one, even though it appears to be cheap, replacing the caps won't be.

mustang958
06-27-2011, 03:52 PM
A very old thread, but had to correct this inaccuracy. Just spotted one locally, and looked at the SM on hi-fi engine. There are actually two dual 13000 uF caps, which will be impossible to source, much like the ones in the Marantz 170DC (and probably others). Replacing them would require four 13000 uF (or thereabouts) caps and mods to the chassis to fit them in. I'm staying far away from the local one, even though it appears to be cheap, replacing the caps won't be.

Are you referring to the A-10 regarding the two dual 13000 uF caps? I'm a novice and was just wondering as I have the SM as well and was trying to locate the caps you were referring to.

audioholic2
11-20-2011, 12:44 AM
A very old thread, but had to correct this inaccuracy. Just spotted one locally, and looked at the SM on hi-fi engine. There are actually two dual 13000 uF caps, which will be impossible to source, much like the ones in the Marantz 170DC (and probably others). Replacing them would require four 13000 uF (or thereabouts) caps and mods to the chassis to fit them in. I'm staying far away from the local one, even though it appears to be cheap, replacing the caps won't be.

An old tread but had to put my 1 cent in. I am using an A-10/T-9, Yamaha NS-200M's, Music Streamer II and Onkyo DX-7211 CD player at the desk/computer and it is just spectacular. The price of these are very cheap. If one used it for a few years and the caps went bad and you threw it in the trash (and bought another to replace it) it is still worth the few years of use IMHO, it is just that nice (I suspect it will actually keep on playing for many years to come). I have a Bryston 4bsst, Marantz 2325 and 2245, and Kenwood 500 Supreme doing duty in the basement while the A-10 is on all day at the desk. It just sound right. It still has not made it to the living room system though. :music::banana: