[DunninLA]

Hi.

I wasn't sure what low discharge meant so I looked that up. I see it means that the battery discharges very little when a current is not being drawn from it. That it is supposed to retain 85% charge in storage for a year at under 69F temperature.

So, what does low discharge have to do with performance in the SR71A? wouldn't the Tysonnic 9V 200mah regular battery (green) perform the same? It is $8 vs. $11 for the low discharge version. I'm just confused because the way these amps eat batteries, who cares if it can store for a year and retain 85% capacity?

 

[jamato8]

No, the low discharge battery uses a different chemistry and it has a lower internal resistance, which adds up to better transient response due to fast current delivery. It is all about the power supply. Squeeze that and everything else is held down. If you wanted water your garden what would work better, or deliver more water over a period of time, a 1/2 inch hose or a 2 inch hose?

 

[DunninLA]

thanks. Where did you read about a different chemisty, lower internal resistance, and faster current delivery? I didn't see any of that on wikiepedia or the website you linked to. It only talked about storage improvements.

 

[jamato8]

I got information from Thomas dist and I have discussed this with two manufactures of audio amps. There is more information available on this technology.

From Thomas Dist:

"As an additional benefit the superlattice alloy increases the electrical capacity of the battery and reduces the internal resistance, which allows higher discharge currents."

 

[sbulack]

Lower internal resistance in a 9V battery (with its 7 or 8 internal cells) also helps audio performance by reducing the voltage variations, present as a ripple, in the voltage level supplied by the battery. Since the performance attributes of audio components can be sensitive to the actual voltage level supplied to them, this additional ripple in the supplied voltage caused by higher internal cell resistance, and the consequent constantly-varying audio component response attributes, is actually audible as a degradation of sound quality. Think of it as something roughly like trying to perform figure skating on ice that has a rippled surface. Since a 9V battery has within it 7 or 8 internal cells in series, the internal resistance in each cell is multiplied by that factor of 7 or 8 to give the overall internal resistance (and consequent voltage ripple) of the 9V battery. The difference can be and is heard.

 

[rodaballo]

Hi Miguel:

When you have time or when enough burnin has cooked the sr71a let us know how it compares with other amps.

May be the Minibox e+?

Best wishes

Antonio

 

[DunninLA]

Thank you. One learns something new every day.

 

[mrarroyo]

Quote:

Originally Posted by rodaballo /img/forum/go_quote.gif Hi Miguel: When you have time or when enough burnin has cooked the sr71a let us know how it compares with other amps. May be the Minibox e+? Best wishes Antonio

Should have additional feedback by Sunday, 11/9.

 

[mrarroyo]

November 8, 2008: Update

Today I spent a bit of time comparing them again. Now the SR71A has about 875 hours of burn-in. Furthermore I am using the Tysonic 200 mAh low discharge and low internal resistance 9 Volt rehargeable batteries. It is my opinion that the Tysonic batteries do make a slight difference in openness and in better extension. All four Tysonic batteries used were on their initial charge. Have no idea if they need burn-in or not, jamato8 will probably chime in and let us know.

For headphones I once again used the Ultrasone PROline 2500 and the Yuin OK1. For line out I used two by ALO: Six Shooter and SXC. The source used was as expected my 160 Gb iPod Classic w/ apple lossless files. For music I used Rachel Ferrel’s album Rachel Ferrel. The song was “Waiting”.

Below is a picture of the gear used today, and of the Tysonic batteries.

In a nutshell all of my findings from a week ago remain. The difference is that the amps are now much closer. At this rate by the time I reach 1,000 hours of burn in on the SR71A the only difference that may be left is an slightly deeper bass, a tad less extension, and a bit narrower soundstage. Or in other words the amps will be more alike than different.

An interst note is that w/ the full size cans both amps sounded better when I used the ALO Six Shooter. However when I switched to the Yuin OK1 then both amps sounded better w/ the ALO SXC. The differences were very noticable, to the point that IMO the Yuin OK1 sounded a bit “congested” with the ALO Six Shooter. This was very peculiar (dare I say weird?), as a norm the Six Shooter has shown to be the better of the two when you compare clarity, detail, and extension.

More to come at the 1,000 hour mark.

 

[SEABREEZE]

Inbound 1 preditor and 1 sr71a, & low discharge tysonic batteries.

I have no experience with iem's, for my home rig I use Senn 650 W/stephan cables.

I listen to smooth jazz and r&b (80%), 20% everything else.

Suggestions with regards to iem's for the two mentioned portable amps above

Also not sure which dock cable to use. Did see mrarroyo mention he liked two different alo's according to headphones.

Plan to use ipod with apples lossless format

Thanks to all for posting in this thread

Has helped me quite abite. ! ! !

 

[hockeyb213]

are you looking for customs or universals? And a budget would be nice to know also

also to anyone using tysonic's can you link the chargers you are using for them. Because I am not exactly sure which will work well for them

 

[SEABREEZE]

Quote:

Originally Posted by hockeyb213 /img/forum/go_quote.gif anyone using tysonic's can you link the chargers you are using for them. Because I am not exactly sure which will work well for them

This is what order taker at thomas distributing recommened for use with the tysonic"s.

- MAHA POWEREX MH-C490F 9 Volt (9V) Battery Charger
FREE Storage Case
4-Channel Smart Battery Charger
World AC Adapter and 12V Cord Included

Product SKU: K-MHC490FDCW

 

[hockeyb213]

thanks yeah I was hoping to get something from thomas distributing since I want to combine the order with the tysonics. Do they take paypal?

 

[sbulack]

Quote:

Originally Posted by hockeyb213 /img/forum/go_quote.gif thanks yeah I was hoping to get something from thomas distributing since I want to combine the order with the tysonics. Do they take paypal?

I've been using the Maha MH-C490F 9V, 4 Channel charger to recharge the Tysonics, and I'm happy with the job that it does. I bought the charger (in 2006) and the Tysonics(this year) from Thomas Distributing which does, BTW, take Paypal.

 

[SEABREEZE]

I've been using the Maha MH-C490F 9V, 4 Channel charger to recharge the Tysonics, and I'm happy with the job that it does.

Good to know