Output impedance of T5?

rotarius · « **on:** 15 Jan 2006, 01:46 am »

I am thinking about upgrading to a T8, I use a T5 currently. I am concerned about the high output impedance of 5Kohm of the T8 so I was curious about what the output impedance of my T5 is? My amp is an Aragon 8002, 22Kohm input impedance. Anyone?

avahifi · « **Reply #1 on:** 15 Jan 2006, 02:52 am »

Actually the Transcendence Eight has day and night better output drive capability than your old Transcendence Five. So if the T5 is not giving you any problems driving your amplifier loads, then the T8 certainly will not.

Too much leaping to conclusions hereabouts. I know its really hard for newcomers to high quality audio to sort out the chaff from the wheat, especially when there are so many chaff vendors selling the crud at really high prices.

The output impedence of the T8 is not high for a vacuum tube preamp, and since almost all rational amplifier will have an input impedence of 10K ohm and higher, its not likely ever to be a problem.

Of course, we do build the Ultra SL hybrid with a 560 ohm output impedance because of its circuit design, but making the choice between a T8 and Ultra SL really should not be based on those considerations (output impredance differences).

If your heard either in the new mother board configurations, each with eight isolated high speed, high voltage, high current, analog power supplies, one for each half of each circuit, I think your jaw would drop.

Frank Van Alstine

rotarius · « **Reply #2 on:** 16 Jan 2006, 01:27 am »

Actually, the reason for the post is because the sound thins out noticeably past 11 o'clock on the T5. I have to turn it up that much on some recordings as my speakers are only 86db sensitive.

avahifi · « **Reply #3 on:** 16 Jan 2006, 01:51 pm »

I would be more suspect of your power ampliier than the T5 regarding a "sound thins out" issue. Running the T5 at 11 o'clock or higher will not have any significant effect on its linearity, but you are making the amp work hard driving an 86 dB efficient speaker and in general, the harder an amplifier is driven, the less linear it gets.

Frank Van Alstine

rotarius · « **Reply #4 on:** 16 Jan 2006, 02:35 pm »

Thanks, frank, i'll look into that.

Charles Calkins · « **Reply #5 on:** 16 Jan 2006, 03:36 pm »

rotarius:
I have Frank's T7ECR pre driving CIA's D-200 amps and at a setting of nine oclock it is very loud. No way I could ever try an eleven oclock setting. Might bring the house down.

Cheers
Charlie

mark funk · « **Reply #6 on:** 16 Jan 2006, 11:08 pm »

Hello, Just wanted to say, I am running a T5SLR and Fet Valve 550 EXR into a pair of 30year old Dahlquist DQ10s just packed with about 40lbs of plasticlay, and I think thay are 87db, When I play rock I run the T5 at 1 or 2 oclock and some times after a glass of wine or 2 or 3 I play some Telarc classical ( I realy like Vauhan Williams Symphony No.2) and have had it at 1:30 and have not heard anything thin just very dynamic and high resolution, actually the DQ10s give up long before the electronics do.

Charles Calkins · « **Reply #7 on:** 16 Jan 2006, 11:14 pm »

mark funk:
2 or 3 oclock???? That's a great big WOW!!! I don't know anybody that turns their volume control that high. I certainly couldn't.

Cheers
Charlie

budyog · « **Reply #8 on:** 16 Jan 2006, 11:24 pm »

I do! Not every day, just every other day. I like to crank it. It sounds sweet! My ACI Panorama's seem to love being driven by my AVA equipment. Most of the time it is between 11 and 1 and 2 and 3 after a few beers

. I like to rock the house and the neighbor's too!

I will keep asking. Any AC members in Minneapolis?

mark funk · « **Reply #9 on:** 16 Jan 2006, 11:42 pm »

Hello Charles, 3oclock is a bit high, that was 2 or 3 glasses of wine

But yes the DQ10s need a little current to fire up even at that volume there is no problem with the electronics. With the T5 and my old amp 28 year old Dyna 416 there were big problems, I am very happy with AVA electronics made my DQ10s sound like new spekers

Charles Calkins · « **Reply #10 on:** 16 Jan 2006, 11:47 pm »

budydog:
All I can say is "Unbelievable"
As I said before at that volume setting the walls on my house would probably collapse.
I hardly ever drink beer.
Once in awhile I like a glass of good wine.
I'm a martini man myself.

Cheers
Charlie

Charles Calkins · « **Reply #11 on:** 16 Jan 2006, 11:52 pm »

markfunk:
The Dalhquist DQ10's were a great speaker in their day. But I kind of preferred the Rectilinear 3's. Remember them?

Cheers
Charlie

budyog · « **Reply #12 on:** 17 Jan 2006, 01:11 am »

Charles,
When the lights are off, and the DVD concert of someone I like starts up along with a few friends over, everyone say's, "How about a little more volume and the concert gets going and they say that again, before you know it, it is at 2 oclock and it is like you are at the show, but the sound is better! It would be loud if you just walked in, but once you are into the show and it is sounding like a wall of sound, it just takes you there. You hear it, feel it, and see it!
The same with a CD, When something sounds so good it just seems to sound better a little louder as long as the system can handle it. The Onkyo 1000 has added a lot to that wall of sound package I must add.

rotarius · « **Reply #13 on:** 17 Jan 2006, 03:42 pm »

An update for those following this thread: I used my H/K receiver to drive the aragon and there were no issues at higher volume, so the amp is fine. As luck would have it, the EI elite gold tubes I ordered came in and I was able to swap out the stock JJ's. Problem solved. For those into tube rolling, the Ei elites are more upfront than the JJ's but have better extension at both ends and more detail. Better suited for my vandersteens.

avahifi · « **Reply #14 on:** 17 Jan 2006, 05:41 pm »

We kind of feel that the EI tubes are a bit too bright sounding and am suspect that the extra "detail" is more of a brightness issue than a real improvement in reaching into the music. We prefer the JJ tubes here. However, to each their own, the EIs may work better in some system applications.

Frank Van Alstine