Have any suggestions as how to increase it's bass response? I'd love to get 35 or 40 Hz bass out of it....Cap changes, perhaps?
Thanks...

It appears there are 4.7uF input caps (electrolytic) on the control board, maybe you could try use Solen 4.3uF poly caps.
The same with the TIP42Cs (power transistor) - pic below - and use instead the MJ15031, with this little mods it will give an overall better performance.

Cool! I need to pick up a bunch of components from Mouser soon anyways....

Thanks!

You're welcome amigo.
BTW, the MJ15031 from Motorola are pure class A bipolar power transistors.
Have fun.

got the ratshack Accurian T-Amp playing XM radio from the satellite box (btw, switching it to a standard integrated is a breeze). sounds good, doesnt have the refinement of the Super T or TA-10.1, and as noted above, doesnt have the slam in the lower frequencies that the other two have. it does go louder, at least with Advent 5002's. for my purposes, movies, $15 is a bargain and now i get to pair the TA-10.1 with the Super T in the bedroom ADS stack rig.

Looked at all the usual suppliers...no luck. Where would you suggest I look for these?
Thanks...

You could try here :

- http://www.4starelectronics.com/catalog3/0416/0416-74.html

- http://www.ampslab.com/components.htm

- http://www.usbid.com/catalog7/page.cfm/19655

- http://www.nowcomponents.com/item2/MJ150254.cfm

Sanken 2SC2922 and 2SA1216 looks great, too.

- http://www.ampslab.com/trans_2sa1216.htm

- http://www.littlediode.com/components/prod...&cat=262&page=1

Enjoy.

This is the only one of these links that doesn't require a $250 or $500 minimum. As for these transistor replacements, will they increase the WPC output, or just clean up the output? I'm assuming they're direct drop in replacements. I guess I need to check the pin-out just to make sure. Suppose they must be something special at $30 the pair...
On a side note, I did pick up another one of these amps yesterday...

EDIT: COOL! I just found the two Sankens at B&D Enterprises for $5 apiece

Awesome, just take them right now!!!!

Sanken's 2SA1216, and its counterpart , the 2SC2922, are ring-emitter transistors.
They also used to be called multi-emitter devices.

Sanken also produces the 2SA1215 and 2SC2921, 150 watt versions.
Nowadays the planar epitaxial technique is solely connected to Sanken.
Sanken produces a great number of other planar epitaxial devices in MT200, e.g. the 2SA1494/2SC3858.
Toshiba produced ring-emitter devices for a relative short period: the 2SA1095 and 2SC2565.

Simply put, a ring-emitter device consists of a great number of transistors on 1 die.
Which translates in a large SOA with an unusual curving, and a very high bandwidth.
The 1216/2922 have a 40 MHz bandwidth, the 1215/2921 do 50 MHZ.
Toshiba's 150 watt 2SA1095/2SC2565 devices even higher at 60 MHz.
High bandwidth translates in high speed, in return this requires less feedback correction.
Less feedback is favorable for low TIM distortion.
Ring-emitter's have a high Hfe, which reduces the current capability of the driver devices, and consequently less current gain from the front end of the amplifier.

These devices are considered the best by many.
Besides many Japanese companies, a great many other audio companies have used the ring-emitter's for output stages.
Nelson Pass for a short period on Forte Audio models, Per Abrahamsen in Electrocompaniet power amps.
In Germany companies as Dieter Burmester in his Burmester 828, Reinhard Wachoviak in the Audiolabor Stark.

BTW, Rotel RHB10
The poweramp model with the Japan Red wooden sidepanels and closed chimney heatsinks.
200W/8 - 330W/4
Used 8 Sanken's per channel, two 1000VA toroids.

In Germany the Berendsen, Linear Acoustics, and Brinkman power amplifiers.
Islem in France.

Elektor did a 200 watt car amplifier design several years ago, with the 2SA1216/2SC2922 for outputs.

Alright, some more ignorant questions. It appears that the 2SA1216 and 2SA2922 are a complementary pair, one being an NPN and the other being a PNP. Do I need to order 1 of each (2 total) for each output channel, or do I match the type of transistor to the TIP42C? I can't tell what type the TIP42C is, so that is another issue. I did check the size measurements, and it looks like the replacements are physically quite a bit bigger, with different thickness pins, and so. Will this require reworking the boards? So many questions....

Thanks....

That's why they are Bipolar Transistors.

Well...maybe this links answer your questions :

First a little bit of info about Transistors : A must read.

http://www.electronics-tutorials.com/basics/transistors.htm

http://www.satcure-focus.com/tutor/page4.htm

http://www.mtmi.vu.lt/pfk/funkc_dariniai/t..._transistor.htm

http://www.tpub.com/neets/book7/25c.htm

Some pratical examples of Sanken's amplifiers :

http://www.soundlabsgroup.com.au/p/LC-EM-A...m+XP+Amp+Module - LC End Millenium, using Sanken's

http://www.soundlabsgroup.com.au/mm5/graph...um_cookbook.pdf - LC End Millenium Cook Book

http://www.sanken-ele.co.jp/en/prod/semicon/pdf/2sa1216e.pdf - Sanken Data sheet.

D'oh! More reading.....AAAHHHHHHHHH!!!!!!!

I'll do it. But do me one small favor.....Tell me what I need to order now, and I'll do it and have the parts to hand when I get ready to tackle the project.....*Groan...I got so much reading to do that's work related, but what the hell*....) Not sure I'm gonna get it done immediately, but I do need to catch up on my transistor theory....

Ah,ah,ah
I know what you mean... but you need to understand that once you'll start to mod you better know something about you're gonna do. We at ST have great links and pages - even downloaded books - in the DIY Links Topic.

So, IMHO first i'll change the caps to the ones i had mention 2 x Solen 4.3uF poly caps and second i'd put another power transistor 2 x Sanken's 2SA1216/2SC2922, just because they are BJT - Bipolar Junction Transistores you only need one BJT. But, since they are hard to find and sometimes expensive, if you can buy two i recomend you do that.

There are another sweet mods you can do later on, but for now this will do dramatic sonic changes, for the better, pf course.

Have fun.

the Radio Shack Accurian T-amp is better than i first thought. after a bit of use the sound has really come together. i originally thought it lacked a bit in the lower end but that's not the case at all, at least with movies, this thing really packs a wallop. put on Pirates of the Carribean yesterday and the walls were literally shaking. the sound quality was quite good too, nice and clean and effects that were nearly as good as being at the theater. i am pretty impressed with this thing.

Glad to know that. I'll try to find one of those over e-bay...
They don't sell them to Europe...