Hairball Audio

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1560 on: December 15, 2018, 04:36:57 PM »
This is crazy. Retested and now 30v test point is now .015V and Cr9 is .56 V

You got all 3 L Brackets tight and secure?  They are part of the grounding.

What is your DC on either of this 1/2W 1k ohm Rs?

Mike
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mixguy

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1561 on: December 16, 2018, 01:26:48 PM »
Brackets are tight. Voltage at the resistors is  .32v

Hairball Audio

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1562 on: December 16, 2018, 01:29:46 PM »
Brackets are tight. Voltage at the resistors is  .32v

30 VDC rail is still good?

Try testing CR9 in circuit with the diode tester function on your DMM.

POWER OFF.

Mike
Hairball Audio, LLC
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mixguy

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1563 on: December 16, 2018, 01:40:41 PM »
Reading is 1.12 reversed it is over scale.

Hairball Audio

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1564 on: December 16, 2018, 01:45:02 PM »
Reading is 1.12 reversed it is over scale.

What is your AC V at the each of the orange wires at the power tx secondary.  Power On, use caution.
Hairball Audio, LLC
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mixguy

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1565 on: December 16, 2018, 02:02:45 PM »
No voltage

Hairball Audio

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1566 on: December 16, 2018, 02:08:26 PM »
No voltage

No AC on either lead w/ power on?

But you have 30V DC at that test point?  Wacky.

Maybe try referencing them against the yellow lead.
Hairball Audio, LLC
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mixguy

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1567 on: December 16, 2018, 02:12:23 PM »
No the 30v rail is .015V and Cr9 is .56 V

Hairball Audio

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1568 on: December 16, 2018, 02:15:06 PM »
No the 30v rail is .015V and Cr9 is .56 V

Do you have 120 VAC across your L and N terminals on your IEC inlet?  Be careful, and you might have to pull the terminals back a little to measure.
Hairball Audio, LLC
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mixguy

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1569 on: December 16, 2018, 02:24:58 PM »
Thanks Mike. The fuse was not properly seated. Now all voltages are correct. Unbelievable how it's the simplest things that trips you up sometimes. Thanks again.


Hairball Audio

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1570 on: December 16, 2018, 02:26:17 PM »
Thanks Mike. The fuse was not properly seated. Now all voltages are correct. Unbelievable how it's the simplest things that trips you up sometimes. Thanks again.

Glad you found it! I'm taking the rest of the day off ;)

Mike
Hairball Audio, LLC
DIY Parts and Kits
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Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1571 on: December 22, 2018, 01:20:51 PM »
Definitely something in your GR Meter Driver Amp section.  You've been through that a few times?

Mike

Just wanted to give an update that all is well. I did the calibration over several times, and it turns out that I wasn't picky enough with the null adjust. Hopefully this helps someone...then there will be some sort of redemption for my sheepish posture.

mixguy

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1572 on: December 23, 2018, 12:59:41 PM »
Mike I just wanted to say thanks again for the help . I have a UA 1176 and I like the sound of this build better.

Hairball Audio

Re: [BUILD] New FET/RACK Official Help Thread - Please read first post!
« Reply #1573 on: January 13, 2019, 12:35:30 PM »
Nice job guys!
Hairball Audio, LLC
DIY Parts and Kits
http://hairballaudio.com/shop

Top secret stuff and upcoming releases:
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http://twitter.com/HairballAudio/