★★ Free PCB for JLH 2005 Class-A Amplifier - Page 32

Puffin · 27th December 2017, 01:11 PM

I built one of these amps using the Siliconray boards some years ago which hasn't been used. I recently ran it for a few days and had problems with the L channel blowing the pcb fuse. Having checked it over it seems that I can't now get the dc offset down and my light bulb tester is glowing brightly when the L channel only is connected (dual mono double psu design)

I Built the board using TIP3055 transistors. My electronics knowledge has increased a little since I built that amp and I have a few questions I wonder if anyone can answer.

I used the TIP 3055's in both positions on the board, but now wonder whether they should both be the same or whether one of them should have been a P channel 2955. I am probably going to replace all the output transistors on both boards and wondered which ones would be favourite for the board's interpretation of the JLH amp.

Puffin · 25th February 2021, 11:55 AM

I had forgotten about the above post. The amp has not been fixed. Anyone?

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27th December 2017, 01:11 PM	#311
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	I built one of these amps using the Siliconray boards some years ago which hasn't been used. I recently ran it for a few days and had problems with the L channel blowing the pcb fuse. Having checked it over it seems that I can't now get the dc offset down and my light bulb tester is glowing brightly when the L channel only is connected (dual mono double psu design) I Built the board using TIP3055 transistors. My electronics knowledge has increased a little since I built that amp and I have a few questions I wonder if anyone can answer. I used the TIP 3055's in both positions on the board, but now wonder whether they should both be the same or whether one of them should have been a P channel 2955. I am probably going to replace all the output transistors on both boards and wondered which ones would be favourite for the board's interpretation of the JLH amp.

25th February 2021, 11:55 AM	#312
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	I had forgotten about the above post. The amp has not been fixed. Anyone?