The power supply is the heart of your power amplifier. It must provide widely varying current outputs to the speaker load which is very reactive in nature, i.e. difficult to drive properly at all frequencies. Only the finest parts providing instantaneous output current over the whole audio band can hope to offer a truly faithful recreation of the amplifier’s input content.


For Hafler DH-200/220 or XL-280 or custom project: 

TP-202 - similar to picture at left*, is a potent toroid power transformer with many important features for an audiophile-grade amplifier.

Technology serves sound:


TP-202: $139 kit, $195 installed if installed with other modifications. Necessary hardware is included with kit, transformer appearance may vary

How to use it: TP-202 can replace the original transformer for a sonic boost appreciated even with efficient speakers. In addition, TP-202 helps you construct a seriously natural sounding power supply with our new PS-200SR power supply or in concert an original Dual-Mono PS-200 board, within the chassis of your Hafler DH-200/220 or XL-280.

Installer Notes: You will need to use a power drill to make the center hole for the transformer bolt (supplied). This will require a 1/4"(or slightly larger) hole. DH-200/220 requires that the fuse holders be moved away from the center of the amp, a tiny bit, if you are going to use the original Hafler boards. Our PA-XX series front-end boards have PCB mounted fuses so that this is not an issue if you are installing or have previously installed these terrific circuit boards in your amp, i.e. you remove the fuse holders completely.


For Hafler DH-500 or custom project:

TP-500 is a pair of 500 Watt toroid power transformers. These transformers will indeed fit when stacked on top of each other. The original transformer was rated at about 680 Watts to be generous, so this upgrade to 1000 Watts is significant. Not only that but you can easily fashion a dual-mono power supply with the PS-200/PS-500V2 circuit.

For sound and technical description refer to TP-200 transformer above.

TP-500(pair of 500 Watt toroids) > $249/kit, $299 installed if installed with another modification in DH-500. Necessary hardware is included with kit, Transformer appearance may differ from illustration.

How to use it:

Installer Notes: You will need to use a power drill to make the center hole for the transformer bolt (supplied). This will require a 1/4 - 5/16" hole. 


For Hafler DH-200/220, XL-280 or custom project: 

LC-200 consists of two 22,000uF/100VDC caps with 5-pin solder terminals, installation hardware, wiring and instructions for installation into the Hafler DH-200 and DH-220. INSTALLATION into XL-280 would be easier with our PS-100 or PS-200 power supply kits.

LC-200: $99 kit, $129 installed if you are having another mod installed at the same time. Kit includes bus wire, insulated wires, solder and detailed instructions. 

If you want two pair installed for a dual-mono approach then have a look at our PS-200 or PS-500 board options.

The Sound:

Then too, you'll know when you hear the LC-200 that even if these caps were the same value as the originals there would be an improvement. They're just plain better sounding. Combined with the TP-202(above) this is a smile inducing power supply upgrade.

Alternative Bright Idea: Used with the TP-202 and our PS-220 power supply board you will have a dual-mono power supply of 40-60,000uF - far more than the 20,000uF of the original Hafler design. That sounds massive and somewhat expensive doesn't it! With our PS-200 series you can achieve dual-mono performance at an affordable price.


Try our PS-500V2 power supply board for an easy to install dual-mono alternative!

For Hafler DH-500 & XL-600, some Adcoms, etc:

LC-500: a kit of two 39,000uF/100VDC caps, similar item shown here, installation hardware, some wiring and instructions for installation into the Hafler DH-500 and XL-600. This is a serious chunk, 78,000uF total, of energy storage compared to the 40,000uF total factory DH-500 power supply caps.

LC-500: $149 kit, $174 installed during another mod  - pair of 39,000uF/100VDC filter caps(2.5" Dia. x 5.1" high, "low post" screw terminals) Kits come with instructions, solder and necessary hardware to ease the installtion. 


The Sound: See LC-200 description above.

*Adcom GFA-555 series requires four filter capacitors, two LC-500 pairs.

Some GFA-555 may requires internal modifications.

Alternative Bright Idea: Check out our PS-500 V2 and PS-500J with our twin stacked toroid power transformer(TP-500) configuration a totally dual-mono power supply of 88,000uF can be easily installed with our PS-500V2 power supply board. That sounds massive and expensive doesn't it! You've seen far smaller power power supplies in $10,000 amplifiers haven't you! That puts a different light on it we think. See below!

Dual-Mono Power Supply Conversions: Interested in greater separation of individual instruments on the sound stage and greater ability to "hold together" in loud passages? Want a more effortless sound with new found stability and a "locked on" sound? Dual-Mono will provide these benefits and more! With the advent of our PS-200/PS-500 power supply boards these mods are much easier than the old style which was built up with individual parts. 

We install CARDAS Connectors and/or CMC GOLD RCA jacks into any amp whether stock or modified. See our "Connector" page for these hi-quality RCA jacks and binding posts!

Power Amplifier Options