Hexfred diode bridge.

tubee · 4th June 2007, 07:23 AM

Hi all

I have in a few days some extra HFA08TB60 diodes to try hexfreds in my hybrid poweramp. Had 6 lying around, ordered 2 extra.

The amp has a tubed voltage stage pio cap coupled, and good old TO-3 Hitachi k135/k50 Mosfets solid state output. It can deliver about 25 to 30 Watts. Each solid state channel has a 120VA (2X22V/2.8A) ringcore transformer, two 10000uF/50V Panasonic caps and a 15A standard diode bridge with 0.1 ohm resistors in AC line to filter some diode noise out.

I mounted (and isolated) the hexfreds on an aluminium L shaped heatsink, 30X30mm footplate.

The HFA08TB60 can deliver 8A continous, and 60A in single pulse current. I think this is possible, but to be safe i want to ask here:
Can i savely use this hexfred without being afraid of blown diodes when it's powered?

Thanks!

tubee · 4th June 2007, 07:31 AM

Here it is:
http://img102.imageshack.us/my.php?image=hybridnw3.jpg

4th June 2007, 07:23 AM	#1
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	Hexfred diode bridge. Hi all I have in a few days some extra HFA08TB60 diodes to try hexfreds in my hybrid poweramp. Had 6 lying around, ordered 2 extra. The amp has a tubed voltage stage pio cap coupled, and good old TO-3 Hitachi k135/k50 Mosfets solid state output. It can deliver about 25 to 30 Watts. Each solid state channel has a 120VA (2X22V/2.8A) ringcore transformer, two 10000uF/50V Panasonic caps and a 15A standard diode bridge with 0.1 ohm resistors in AC line to filter some diode noise out. I mounted (and isolated) the hexfreds on an aluminium L shaped heatsink, 30X30mm footplate. The HFA08TB60 can deliver 8A continous, and 60A in single pulse current. I think this is possible, but to be safe i want to ask here: Can i savely use this hexfred without being afraid of blown diodes when it's powered? Thanks! __________________ Daisy Bell

4th June 2007, 07:31 AM	#2
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	Here it is: http://img102.imageshack.us/my.php?image=hybridnw3.jpg __________________ Daisy Bell

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