Pictures of my Latest T Amp

[Panelhead]

This one is dual mono. The channels used were matched up for dc offset. The boards are the latest, no slug. The gold heatsinks are from Mexx Mexx.

[Panelhead]

Using the 5.00 clearance batteries from Walmart, each board has its own 2.3 aH, 12 volt SLA. Plus a 3300 and 3900 ufd Panasonic FM cap.

[Panelhead]

The connector used for power is a 4 pin XLR.

[Panelhead]

The boards are mounted at each end of chassis. The extra filter caps are in the middle. The air core inductors inbetween.
The board have a pair of 330 ufd FM caps soldered to the power pins. The stock cpa has replaced with a 1200 ufd FM cap. Total capacitance measures at 9500 ufd per channel.
The input cap is a 2.2 ufd ceramic. The feedback is stock.
The box is lined with mumetal, for both shielding and mechanical dampening. The extra weight is nice.

[Panelhead]

The inductors are a good ways from the chips, this is not supposed to be good.

[Panelhead]

This shows the new amp sitting on a Samsung HD-841 player, a Monica II dac, Marantz SA-8260 player, Pioneer TX-9100, Pearl phono, linestage, Micro Seiki DDX-1000, and Finally Lowther PM7A drivers in folded TQWT cabinets.
The amp usually sits on bottom by itself. Set it up to allow switching from Marantz to Monica quickly to compare sonics. Marantz wins for now.

George

[jdybnis]

Very nice.

Is that a Hammond die cast box? Do you have any problems with overheating when the case is closed?

[Jim McPherson]

It looks like you've got 2 T-amps in there, yet only 2 speaker outputs. How do you achieve "dual mono" with 4 channels that are not bridgeable?


-Jim

[Panelhead]

Originally posted by Jim McPherson
It looks like you've got 2 T-amps in there, yet only 2 speaker outputs. How do you achieve "dual mono" with 4 channels that are not bridgeable?


-Jim

It only uses one channel from each board. This does not increase the power. The two selected have the same dc offset, about 15 mv.
The boards share a common power supply when used as stereo. This one has a battery for each channel.
The unused channel has the input grounded at the 7 pin connector and a 10 ohm carbon comp resistor across the output to load it. The stock chokes were left in the inused channel.
The box does not get warm. It is a diecast aluminum box. The heat generated by the chips is very low. I cannot tell when it is on by touching the box.
The heatsinks were used because the later generation boards lack the solder slugs. The 2024 does get rather warm without the slugs. The heatsink barely gets warm. But I have heard reports of the latest SI's crapping out. I think maybe the 2024 is overheating.

George

[LBHajdu]

Are those low value foil inductors I see in there? Where did you manage to get such low value inductors? The lowest values I can find are 50uH?