Cheap emergency gold sockets - Page 2

Nordic · 13th February 2007, 08:31 PM

Hi D. yes, am aware of it... V3 is so tight no socket would fit anyway... this one is just to listen to for a day or so and to build some courage...

very sentimental, but beats any chip headphone amp I've build in sound quality area... only tiny bit of hum... but then again look at my psu

real hybrid.... 9V cells, smps, j-fets, mosfets, tubes, and regulators

diegot · 14th February 2007, 04:01 PM

here is my one
just had finish the soldering job
i built the simple version because i cant find small pots here in my city.

regards

Nordic · 15th February 2007, 03:21 AM

Diegot, please send me a link for the pcb ... looking for that one... etched the V3, but it is rediculously small... have seen tubes with a larger footprint.

The one I built is very unstable... it oscilates on power on... gotta pull the tube and reinsert with the power running to fix... then you have to adjust the trimpots to make noise go away.

Then it sounds awesome I think the heatsinks on my IRF610s are too small... we are talking very hot.... Wonder if grid stoppers would help.

diegot · 15th February 2007, 08:51 PM

Nordic
I made the PCB of this link
http://www.headphoneamp.co.kr/bbs/zb...sijosae&no=247

Mine is rock solid. At the start up have a few seconds delay and then the sound starts. Very good but I have a little of hum, because i'm not using a regulated power supply yet. No grid sttopers required and it's pluged direct in the source, no volume control.

I just adjusted the trimpots just once, since then everything is fine.
I'm having 17V at the anodes but 7.3V at heaters, I need a larger resistor value on the 317.

At the output I'm using IRF530, wanna to try the 610 or 510 because their input capacitance, many times smaller than the 530, so I hope to get better treble.

The heatsinks are pulled of from a old At power supply and get real hot too, but I think that is fine for 2W of dissipation, I have two heatsinks.

Any problems you have I'm avaiable to help.

Regards,
Diego

Nordic · 16th February 2007, 11:59 AM

Thanks, mine.....
still got to wire up pots... get new irf610s for the long legs, and then want to mount to base of CPU cooler...

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13th February 2007, 08:31 PM	#11
Nordic diyAudio Member Join Date: Sep 2005	Hi D. yes, am aware of it... V3 is so tight no socket would fit anyway... this one is just to listen to for a day or so and to build some courage... very sentimental, but beats any chip headphone amp I've build in sound quality area... only tiny bit of hum... but then again look at my psu real hybrid.... 9V cells, smps, j-fets, mosfets, tubes, and regulators

14th February 2007, 04:01 PM	#12
diegot diyAudio Member Join Date: Sep 2004 Location: Brazil	here is my one just had finish the soldering job i built the simple version because i cant find small pots here in my city. regards

15th February 2007, 03:21 AM	#13
Nordic diyAudio Member Join Date: Sep 2005	Diegot, please send me a link for the pcb ... looking for that one... etched the V3, but it is rediculously small... have seen tubes with a larger footprint. The one I built is very unstable... it oscilates on power on... gotta pull the tube and reinsert with the power running to fix... then you have to adjust the trimpots to make noise go away. Then it sounds awesome I think the heatsinks on my IRF610s are too small... we are talking very hot.... Wonder if grid stoppers would help.

15th February 2007, 08:51 PM	#14
diegot diyAudio Member Join Date: Sep 2004 Location: Brazil	Nordic I made the PCB of this link http://www.headphoneamp.co.kr/bbs/zb...sijosae&no=247 Mine is rock solid. At the start up have a few seconds delay and then the sound starts. Very good but I have a little of hum, because i'm not using a regulated power supply yet. No grid sttopers required and it's pluged direct in the source, no volume control. I just adjusted the trimpots just once, since then everything is fine. I'm having 17V at the anodes but 7.3V at heaters, I need a larger resistor value on the 317. At the output I'm using IRF530, wanna to try the 610 or 510 because their input capacitance, many times smaller than the 530, so I hope to get better treble. The heatsinks are pulled of from a old At power supply and get real hot too, but I think that is fine for 2W of dissipation, I have two heatsinks. Any problems you have I'm avaiable to help. Regards, Diego

16th February 2007, 11:59 AM	#15
Nordic diyAudio Member Join Date: Sep 2005	Thanks, mine..... still got to wire up pots... get new irf610s for the long legs, and then want to mount to base of CPU cooler...

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