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Old 4th May 2018, 04:56 AM   #15871
GordR is offline GordR  Canada
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Quote:
Originally Posted by fgroen View Post
Just check the F5 Turbo article. http://www.firstwatt.com/pdf/art_f5_turbo.pdf

It will give plenty of directions how to run your F5 off a higher power supply voltage. According to Nelson the Toshiba JFETs should be able to handle +/- 28VDC just fine. Did you have trusted parts for the JFETs?

Thanks for the link, that is a huge help! As far as the JFets, they are from the DIY audio store...Linear Systems which I believe are trustworthy. I was definitely running too much bias so am going to run it lower now for safe measures.
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Old 4th May 2018, 06:01 AM   #15872
Kosst Amojan is offline Kosst Amojan  United States
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I'm using the LSK170/LSJ74 parts running 32.5V rails and they're holding up just fine. They've been at it 8 or 9 months now. I do have a bit of copper heatsink between them.
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Old 1st June 2018, 05:33 PM   #15873
dezibaby is offline dezibaby  Germany
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Hi everyone, I'm notifying community that my project is complete. So, Pearl Two, B1 and F5 are up and running. First of all I would like to thank my audiphile god for the possibility to build this schematic! This had taken me four years and brought a lot of experiences. On this audiophile Qualitätsneveu I would never have come if I would buy equal quality. Thanks alot! The rest of the chain are Ortofon MC 30 super II and JBL Ti6K.
I'm overjoyed!
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Old 2nd June 2018, 10:15 AM   #15874
dezibaby is offline dezibaby  Germany
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Originally Posted by dezibaby View Post
Hi everyone, I'm notifying community that my project is complete. So, Pearl Two, B1 and F5 are up and running. First of all I would like to thank my audiphile god for the possibility to build this schematic! This had taken me four years and brought a lot of experiences. On this audiophile Qualitätsneveu I would never have come if I would buy equal quality. Thanks alot! The rest of the chain are Ortofon MC 30 super II and JBL Ti6K.
I'm overjoyed!
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Old 2nd June 2018, 11:28 PM   #15875
Steve Duffy is offline Steve Duffy  New Zealand
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Well done, looks right at home
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I am, to all intents and purposes, foolproof and incapable of error.
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Old 4th June 2018, 08:28 AM   #15876
fgroen is offline fgroen  Netherlands
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Nice job!

If the power supply input of the PearlII is an IEC mains connector, I would recommend changing it to something less risky, like a Neutrik XLR or the like. In the best case it takes only one uninformed member of your surroundings to put 240VAC on your circuit boards.

Worst case is that you plug in a mains cable yourself.

My dad told me that when he was young he'd figure mains plugs were a good and solid connector for his DIY speakers, until my granddad saw a loose plug lying around and decided to put it where it belongs. Carnage guaranteed. :-)
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Old 4th June 2018, 09:37 AM   #15877
dezibaby is offline dezibaby  Germany
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Hello, this is IEC-60320 C15/C15a and C16/C16a connection, which is theonly one in the household and therewith no one to mess with. It was chep, that's why.
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Old 4th June 2018, 09:40 AM   #15878
fgroen is offline fgroen  Netherlands
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Quote:
Originally Posted by dezibaby View Post
Hello, this is IEC-60320 C15/C15a and C16/C16a connection, which is theonly one in the household and therewith no one to mess with. It was chep, that's why.

Ah. All good then

As long as no one can blow up your precious fruits of labour.
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Old 20th June 2018, 03:13 PM   #15879
dezibaby is offline dezibaby  Germany
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Hello community,
I have this chain: Pearl Two, B1 and F5 finished, as I have already written I am overjoyed and have to continue to spend a lot of time. Despite all my question: whether someone has already built these devices symmetrical?
Do not want to spend too much time looking for plans.
Thank you.
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Old 20th June 2018, 05:56 PM   #15880
Hikari1 is offline Hikari1  United States
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Quote:
Originally Posted by dezibaby View Post
Hello community,
I have this chain: Pearl Two, B1 and F5 finished, as I have already written I am overjoyed and have to continue to spend a lot of time. Despite all my question: whether someone has already built these devices symmetrical?
Do not want to spend too much time looking for plans.
Thank you.
Pearl 2, no. B1 has DCB1 and B1 rev2 variants. F5 is already symmetrical.
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