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What is the most affordable decent amp for the akg k1000? - Page 3

post #31 of 56
Quote:
Originally Posted by dc_guy
There is a definite increase in bass quantity over the original T-amp. The Super T-amp is not bass shy.

As far as the SLA battery goes, I'd really like to try that, but I'm kind of a noob and have no idea what kind of battery to buy or how I'd go about hooking up an SLA battery to the back of the Super-T amp.

I have an SLA battery for my Squeezebox 3 that I think I could use to power the Super-T, but it has a different connector and I'm not sure I could put it back together if I took it apart.

Any suggestions on SLA batteries and the Super-T?

Thanks.
Squeezebox 3 also uses 12VDC I believe, so that SLA battery should be just fine. If you can get to the actual + and - battery terminals, all you have to do is hook up the battery cable to the terminals. Super-T comes with battery cable with the right jack already and the two O-rings for battery terminals. If you have the usual SLA battery, the battery contacts are square tabs, so you can't just use the O-rings on them, but all you have to do is just keep them in contact, so use a strong alligator clip or tape, etc.

The Super-T battery cable should hopefully be labelled for + and -, but if not, just make sure the center pin of jack that goes to super-T is hooked up to + terminal on the battery.
post #32 of 56
I have been using a modified SI T-Amp for about 6 months. I have been very happy with it running my K1000s. Based upon this experience and with my enjoyment of DIY I decided to try another Tripath kit which would give me a bit more power and allow me to upgrade parts more easily, especially the input capacitors which on the SI are too small a value and very hard to replace without trashing the board.

I chose a kit from Audiodigit which is sold through Autocostruire in Italy. http://www.autocostruire.it. A similar kit is available from www.diyparadise.com and gets very good marks on the Class D forum at www.diyadio.com.

The short version is that this thing is remarkable: tons of detail, a rich midrange, and way more quality bass than I thought that the K1000s could produce. The only changes I have made to the circuit so far were to replace the input caps with some polypropylenes that I had on hand and to replace the on-board power supply caps with some Blackgates. I have the amp running on a sealed lead acid battery right now but I have an SMPS power supply coming to try out.

Hanging out in the Class D forum has also gotten me interested in the Hypex UCD amp modules which can be obtained through DIYcable.com. The modules produce well over 100 watts of very refined and quiet Class D power. Supposedly they are even better sounding than the Tripath amps and do not have the problem of rising high end response as impedance rises. This rising high end is why it is a good idea to put a ~5 ohm-5 watt resistor accross each output to give the amp a more "normal" load. These UCD amps also allow you to wire the outputs into a normal headphone jack because they do not float their output ground above zero like the Tripath amps.

The two T-Amp stereo kits are each under a hundred dollars. The UCD kits start at $80 for a single channel. You will still need power supplies, case, connectors etc.

If you are inclined toward DIY things are looking pretty great for K1000s. I will post again after I get the Hypex amp built

Best,

Paul

post #33 of 56
The stock squeezebox 3 uses a 5V supply, I think.

After mods, the RWA SB2/3 uses a battery supply that feeds both regulated 5VDC (for the SB main power input) and 12V (for the DAC and the SPDIF output buffer) into the unit via a custom 3 pin power outlet jack. The power cord between the supply and the SB2/3 has three leads, one for the 12V, one for the 5V and one for the ground.

So, if your battery supply for the SB3 comes from Vinnie, I'd be careful using it solely for the 12V power output.

Chad
post #34 of 56
My PrimaLuna Prologue One drives the K1000's very well
post #35 of 56
Okay, I won't use Vinnie's SB3 battery for the Super-T. Parts Express links to this battery as an "accessory" for the Super-T: http://www.partsexpress.com/pe/showd...number=263-144 Assuming this is the right size (which I'm not even sure of), if I were to purchase this battery, how would I go about charging/recharging it? The one from Vinnie comes with a charger. This one does not, as far as I can tell.

------------------

Quote:
Originally Posted by chadh
The stock squeezebox 3 uses a 5V supply, I think.

After mods, the RWA SB2/3 uses a battery supply that feeds both regulated 5VDC (for the SB main power input) and 12V (for the DAC and the SPDIF output buffer) into the unit via a custom 3 pin power outlet jack. The power cord between the supply and the SB2/3 has three leads, one for the 12V, one for the 5V and one for the ground.

So, if your battery supply for the SB3 comes from Vinnie, I'd be careful using it solely for the 12V power output.

Chad
post #36 of 56
That battery you linked to is $140!!

The usual SLA battery types RWA uses is something like this
http://www.batterymart.com/battery.mv?p=SLA-12V7-F1 for only $9. It's 7 Amp-hours and bigger than ones used in RWA Clari-T.
The same website sells 12V battery chargers as well.
post #37 of 56
I use something like this to power T-amp:
http://www.7453217467431.com/product...=1140073744093

It has a chip controlled recharging program built-in and voltage indicator, which makes recharging easy. It needs to be recharged only monthly, because of its capacity (19 AH).
post #38 of 56
An auto or marine SLA battery does seem to be the way to go, especially those with built-in recharging chips. Any other suggestions for places to look for these?

And what's the deal with capacity (AH) vs. voltage? What characteristics should I be looking for in a 12-Volt battery? How much power does it need to put out to keep the Super-T amp humming?

Thanks!


Quote:
Originally Posted by Ferbose
I use something like this to power T-amp:
http://www.7453217467431.com/product...=1140073744093

It has a chip controlled recharging program built-in and voltage indicator, which makes recharging easy. It needs to be recharged only monthly, because of its capacity (19 AH).
post #39 of 56
I've done it!!!!!! I just bought the PPX3-SLAM to power my K1K. Does anybody have experiences in regard to this amp and 1K combo?
post #40 of 56
Quote:
Originally Posted by jamesp
I've done it!!!!!! I just bought the PPX3-SLAM to power my K1K. Does anybody have experiences in regard to this amp and 1K combo?
I'm pretty sure that member Yikes loves it. I haven't heard them together myself.
post #41 of 56
Quote:
Originally Posted by dc_guy
An auto or marine SLA battery does seem to be the way to go, especially those with built-in recharging chips. Any other suggestions for places to look for these?

And what's the deal with capacity (AH) vs. voltage? What characteristics should I be looking for in a 12-Volt battery? How much power does it need to put out to keep the Super-T amp humming?

Thanks!
1. Pep Boys or online automobile supply merchants

2. Alkaline batteries (700 mAH) can keep T-amp running for hours. So 19 AH can keep them running for weeks (listening a few hours per day).
post #42 of 56
Quote:
Originally Posted by jamesp
I've done it!!!!!! I just bought the PPX3-SLAM to power my K1K. Does anybody have experiences in regard to this amp and 1K combo?

The PPX3 SLAM is what I use to power my K1000s, and the combo sounds beautiful to me. I predict you will be very happy with your PPX3->K1000 combo, not to mention how great the PPX3 SLAM sounds with other phones. You have chosen wisely grasshopper.

Let us know what you think once you get your amp and have a chance to spend some time with it.

post #43 of 56
LOL....the SLAM came today, I'm dying to listen to it, but I have no idea which tube suppose to go where....somehelp is appreciated.
post #44 of 56
The T amp reminded me of what the AKG SAC K1000 amp sounded like.

The SAC amp was able to go really really loud. Not to mention really really hot.

-Ed
post #45 of 56

SAC Amp

FYI, Jan Meier has one SAC K1000 amp in stock. The price is pretty decent at $600 (I think). I haven't heard it, so can't comment on the sound.

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