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In Reply to: Sorry...tell me again the sensitivity of your speakers, the volume (not area)... posted by jeffreybehr on January 7, 2007 at 18:41:36:
Jeff,My innersound MK I's sensitivity is rated at 92db.
My music room's dimension is 18x22x8 which gives ~ 3200CF as well.
I used a sound meter to make sure I don't over do it with my music and I find I like to listen at 82-87 db volume setting.
I may have gone a bit overboard when did the sound treatement for my room. I put up about 20 cornings 503 fiberglass panels, so it's not a lively room.
The innersound is a bi-amp configuration so I only need the SET amp to drive the panel or mid to high frequencies. I have an innersound amp that takes care of the bass frequencies (from 150 hz and below.
Do you still think 20-30 watt is right for me or can I do with less and try those fame 300b's?
Gerald
Follow Ups:
You speakers are 6dB more sensitive, so that would be the equivalent of your driving yours with 12-1/2 Watts relative to my driving mine with 50. So 20 Watts ought to do just finely, especially if you're driving 'only' MR and treble.I suggest you look for an earlier version of the ASL AQ1006(845).
Here http://cgi.audiogon.com/cgi-bin/auc.pl?ampstube&1169432037 is one pair, and here http://cls.audiogon.com/cgi-bin/cls.pl?ampstube&1172356561 is another. I BELIEVE the 1st-listed pair, with the shiny chassis, is the 1st version, while the 2nd pair, with the extruded-aluminum chassis, is v.2. I'd be inclined toward the 2nd pair 1st.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
Jeffrey,Just wanted to let you know that I made an offer for that second AQL listed and the seller has accepted.
So I'm looking forward to trying out that amp on my innersound hybrid.
Thanks for your help in my amp selection!
Gerald
My 2 recommendations are the affordable Ken-Rad in parallel or staggered plate versions, VT-231 or not, seems not to matter. In the really-high-end bracket, the Tung-Sol RoundPlate. These are fairly rare and sometimes rather expensive, with prices varying from maybe $60 to $250 EACH depending on condition, with most in the $100 - $150 range.I find the KRs to be VERY well balanced, with a touch of warmth, very clean MR and treble, with the latter being at just the right level for me, which is NOT too much. Most other 'N7s are a tad tizzy for me. Some find the KRs' bass to be stronger than that of other 'N7s, but I've not heard that.
The RPs are about the same as the KRs but are slightly more spacious. I'm now collecting RPs, slowly and carefully.
V1 is the Voltage-gain stage while V2 is the driver. That means that you'll hear differences among tubes in the 1st position more readily than in the 2nd. Both 'N7s have the triodes connected as SRPPs; see linked thread for that discussion. BTW my dealer highly recommends old RCA blackplates for the 6L6; I bought 2 pairs but I couldn't hear diffferences in the short-term.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
- http://db.audioasylum.com/cgi/m.mpl?forum=tubediy&n=108914&highlight=845+jeffreybehr&r=&session= (Open in New Window)
Jeffrey,I found this link for the AQL amp and it talked of the need to upgrade the caps for this amp to avoid arcing over time. Did you experience this problem with your amp?
http://www.10audio.com/asl_1006-845dt.htm
Gerald
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
Jeffrey,I found this link for the AQL amp and it talked of the need to upgrade the caps for this amp to avoid arcing over time. Did you experience this problem with your amp?
http://www.10audio.com/asl_1006-845dt.htm
Gerald
...what Voltage your main-PS caps are. If they're 500s, they're OK.BTW they're in series for the amp's almost-1000VDC main powersupply.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
Jeffrey,I'll have to check when I received the amps.
Base on the reviews I've seen this is an amazing little amp. Although knowing the crude impedance curve that the innersounds are known for, swings from 2-16 ohms. I'm wondering if there's any tweaks that can help buffer this for the amps.
I've heard of people hooking in transformers between the speakers and the amps. I don't know if they did that to help stablize the impedance the amp sees. Would you know anything about that?
Gerald
You might experiment with the 4- v. 8- v. 16-Ohm taps. As you move up, the apparent loudness increases, but the amp has no more power at one v. any other tap. You'll just have to determine which sounds best overall.The transformer you write about probably is the Paul Speltz Zero. I'd listen a long time without it before spending at least $450 for the Zeros.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
Jeffrey,Did you find those Zero's a worthwhile investment? What affect did the Zeros have to the music in youir setup?
Will this transformers help buffer the amps?
Gerald
...the amp drives, I think to double or triple. So if you have a speaker that varies from 2 to 10 Ohms, it'll now vary from 4 to 20 or 6 to 30.Sometimes amps are more able to drive different impedances with flatter frequency responses than other impedances. If one had plenty of power available, I suppose I'd try the lowest-impedance output taps into a substantially higher-impedance transformer/speaker load. I THINK you'll get the highest damping factor and the flattest frequency response that way.
But maybe someone who KNOWs rather than I who am merely speculating will help here.
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
Ah yes, the fun part of customizing the sound to my liking...yum!I've been rolling some tubes with my Cary SLP which uses some of the same tubes as the AQL. Both has the 'N7s tubes which I have a small collection of now. I did manage to get my hand on a pair of Tung-sol round plates. That's what I listen to now in my Cary pre-amp. I also got a pair of wartime RCA's and another pair of sylvania's from the 50's.
I'm glad I'll be able to try out some of these old tubes in the new amp. The tough decision is why to invest those RP's...keep them in my pre-amp or put them in the power amp.
I'll have to remember you point on the 6L6 and keep an eye out for those RCA's.
I've been taking my chances on ebay mostly in collecting tubes, do you have a good source for NOS?
Gerald
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Tin-eared audiofool and obsessed landscape fotografer.
http://community.webshots.com/user/jeffreybehr
Jeffrey,Thanks for helping me make my decision. A SET amp is definitely going to be my next amp....and you read my mind on what would be my next question, which is what amp you would recommend :)
Thanks for helping me find the audiogon listing. This is very helpful.
Thank you all for you great advice and info!!!
Gerald
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