Difference between Hafler DH-200/220?
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dshoaf
That high voltage buzz
The output ratings went up by 10 extra watts due to power supply changes. Otherwise, pretty much the same insides. At some point during the changeover, though, the driver boards were redesigned. Other changes included:
- Rounded heat sink fins - thank goodness - would have bled to death on those originals; they were sharp!
- Reorientation of the read apron layout for connectors.
Outside of that, not much difference.
BTW, Avionic beat me to the most obvious answer!
Cheers,
David
- Rounded heat sink fins - thank goodness - would have bled to death on those originals; they were sharp!
- Reorientation of the read apron layout for connectors.
Outside of that, not much difference.
BTW, Avionic beat me to the most obvious answer!
Cheers,
David
ouimetnick
Hafler Fan!
DH-200 used PC-6 boards. The transformer gave less voltage than the DH-220 transformer did. The heatsinks fins have given me a few cuts on my DH-200.. DH-220 is rounded fin wise. The DH-220 used PC-6 boards when introduced. Then Hafler simplified their line and created a PC-19 circuit board.
There is a PC-19A, a PC-19C, and a PC-19C. The PC-19C includes a lot of the mods people did to the PC-6 boards. The reason I say simplified their line, is the DH-500 used PC-10 boards, and it got scary. So the DH-500, P-225, P-230, P-500, and the DH-220 all used PC-19 boards... much simpler.
The DH-220 and DH-200 used the same Hitachi MOSFET outputs. They are
2SK134 (Hafler Part number for DH-200 is 571134) (DH-220 is QN112)
2SJ49 ( Hafler Part number for DH-200 is 561049) (DH-220 is QP112)
As you would imagine, 2SK134 is the N Channel MOSFET
2SJ49 is the P Channel MOSFET
The filter caps in these units are 10,000µF 75V, but people like to toss in larger capacitance ones. Of course, it may be helpful to put in a beefier rectifier, when doing this.
Also, the back panel screams for better hardware. Gold binding post that accept real wire (larger than 18AWG), and real RCA jacks, not the crummy ones.
The switches in these units are prone to failure due to the large amount in inrush current at power on. So a beefier switch rated at 15 Amps is a good idea. Or keep the switch set to on, and power it up with a power strip.
There is a PC-19A, a PC-19C, and a PC-19C. The PC-19C includes a lot of the mods people did to the PC-6 boards. The reason I say simplified their line, is the DH-500 used PC-10 boards, and it got scary. So the DH-500, P-225, P-230, P-500, and the DH-220 all used PC-19 boards... much simpler.
The DH-220 and DH-200 used the same Hitachi MOSFET outputs. They are
2SK134 (Hafler Part number for DH-200 is 571134) (DH-220 is QN112)
2SJ49 ( Hafler Part number for DH-200 is 561049) (DH-220 is QP112)
As you would imagine, 2SK134 is the N Channel MOSFET
2SJ49 is the P Channel MOSFET
The filter caps in these units are 10,000µF 75V, but people like to toss in larger capacitance ones. Of course, it may be helpful to put in a beefier rectifier, when doing this.
Also, the back panel screams for better hardware. Gold binding post that accept real wire (larger than 18AWG), and real RCA jacks, not the crummy ones.
The switches in these units are prone to failure due to the large amount in inrush current at power on. So a beefier switch rated at 15 Amps is a good idea. Or keep the switch set to on, and power it up with a power strip.
