BOZ voltages, worry or not?

bays_9a5tt · 6th September 2005, 10:58 PM

Finished BOZ last night, and after initial listening zenlight, did some voltage measurements.
It seems like some voltages aren't close to values noted on original schematic diagram. Here is what I measure:
Supply: 60V
P101/201: 13.3V - 13.0V
D101/201 cathode: 7.57V - 7.46V
Q101/201 drain: 20V
Q101/201 source: 3.92V - 3.8V
Mosfets are IR's IRF510
Preamp is playing beautiful for more than a day now. Should I worry about the voltages or stop right now ?

Photos will be online in few days.
Thanks to mr Pass for sharing this excellent design with DIY crew.

Regards,
Tom

jh6you · 7th September 2005, 04:04 AM

I think that the figures Nelson wrote down here and there are all nominal values, behind which there are always +/- tolerances: 0.1%, 1%, 10% . . . But, he never writes down them to us! Hi, I am not complaining you, Nelson. Moreover, all measuring equipments have their tolerances in accuracy. This means the tolerances are our own we should judge in real life. You know? Nelson always expect that we should do some work ourselves.

If the values you measured were mine, I would not worry about at all. Relax and enjoy the music!

Regards
jH

bays_9a5tt · 7th September 2005, 11:03 AM

hi JH,
thanks for replying - feel like I spent too much time at my work with 4-and half digit multimeter, tweaking pots at +2.925V (for instance).
thumbs up for my new BOZ

73s Tom 9A5TT

6th September 2005, 10:58 PM	#1
bays_9a5tt diyAudio Member Join Date: Jan 2005 Location: Zagreb	BOZ voltages, worry or not? Finished BOZ last night, and after initial listening zenlight, did some voltage measurements. It seems like some voltages aren't close to values noted on original schematic diagram. Here is what I measure: Supply: 60V P101/201: 13.3V - 13.0V D101/201 cathode: 7.57V - 7.46V Q101/201 drain: 20V Q101/201 source: 3.92V - 3.8V Mosfets are IR's IRF510 Preamp is playing beautiful for more than a day now. Should I worry about the voltages or stop right now ? Photos will be online in few days. Thanks to mr Pass for sharing this excellent design with DIY crew. Regards, Tom

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7th September 2005, 04:04 AM	#2
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	I think that the figures Nelson wrote down here and there are all nominal values, behind which there are always +/- tolerances: 0.1%, 1%, 10% . . . But, he never writes down them to us! Hi, I am not complaining you, Nelson. Moreover, all measuring equipments have their tolerances in accuracy. This means the tolerances are our own we should judge in real life. You know? Nelson always expect that we should do some work ourselves. If the values you measured were mine, I would not worry about at all. Relax and enjoy the music! Regards jH

7th September 2005, 11:03 AM	#3
bays_9a5tt diyAudio Member Join Date: Jan 2005 Location: Zagreb	hi JH, thanks for replying - feel like I spent too much time at my work with 4-and half digit multimeter, tweaking pots at +2.925V (for instance). thumbs up for my new BOZ 73s Tom 9A5TT

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