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Old 16th April 2020, 09:00 AM   #271
Grunnet is offline Grunnet  Denmark
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Default Tube psu

Hi. I have played a lot with solid state diy, but have absolutely no experience with tube stuff. I have bought an old Musical Fidelity Nuvista DAC with a tube output stage, and since it is some 15 years old, I decided to change the electrolytic capacitors before they began leaking. I started with the PSU, replacing all electrolytics with the same values. After that the 4x100 volt capacitors will give me an electric chock, if I touch the metal bottom of the capacitor and the chassis simultaneusly. I have never worked with a 100v capacitor before, but is that normal or did I forget a ground connection somewhere ???
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Old 16th April 2020, 09:04 AM   #272
Grunnet is offline Grunnet  Denmark
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PS. The capacitors in question are Nichicon KX.
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Old 2nd August 2020, 02:27 AM   #273
citabria90 is offline citabria90  United States
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Quote:
Originally Posted by pedroskova View Post
The Naval Electrical Engineering Training Series(NEETS)

Here's the link to the section on tubes. Easy to understand, and pretty thorough.

Neets Module 06-Introduction to Electronic Emission, Tubes, and Power Supplies
/Users/admin/Desktop/easy to understand?.png
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Old 27th November 2020, 07:29 AM   #274
NickKUK is offline NickKUK
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Ground loops
1. http://eet.etec.wwu.edu/AndyS/projec...2017%20(1).pdf
2. http://www.valvewizard.co.uk/Grounding.pdf
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Old 27th November 2020, 07:33 AM   #275
NickKUK is offline NickKUK
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Join Date: Dec 2019
Quote:
Originally Posted by Grunnet View Post
Hi. I have played a lot with solid state diy, but have absolutely no experience with tube stuff. I have bought an old Musical Fidelity Nuvista DAC with a tube output stage, and since it is some 15 years old, I decided to change the electrolytic capacitors before they began leaking. I started with the PSU, replacing all electrolytics with the same values. After that the 4x100 volt capacitors will give me an electric chock, if I touch the metal bottom of the capacitor and the chassis simultaneusly. I have never worked with a 100v capacitor before, but is that normal or did I forget a ground connection somewhere ???
Probably worth watching Mr Carlsons Lab YouTube channel - specifically when he's talking about working with larger/high voltage capacitors. This includes (a) using a resistor to discharge and (b) keeping the terminal shorted once discharged as they will start climbing again.
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Old 3rd December 2020, 09:55 AM   #276
NickKUK is offline NickKUK
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Any good links for negative feedback and phase?
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Old 3rd December 2020, 11:19 AM   #277
Kei is offline Kei  Wales
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I'm sure there are plenty more but these are what I used to help when dealing with my feedback nightmare on my build of a mullard 5-20.
https://dalmura.com.au/static/corrective%20networks.pdf
https://worldradiohistory.com/UK/Wir...ld-1951-03.pdf
Amplifier Compensation.
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Tools: Fluke 28 II, Tektronix 2246A & 2432A, Lindos LA100 audio analyser set, TTi TG2000, Weller PU-1D/TCP-1, Digimess HY3010 30V 10A bench supply

Last edited by Kei; 3rd December 2020 at 11:22 AM.
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Old 16th December 2020, 05:13 PM   #278
NickKUK is offline NickKUK
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Calculating ladder Butterworth filters: https://inst.eecs.berkeley.edu/~ee24...res/L4_f07.pdf

Very useful tool too: RF Tools | LC Filter Design Tool

Last edited by NickKUK; 16th December 2020 at 05:26 PM.
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Old 19th December 2020, 12:57 PM   #279
NickKUK is offline NickKUK
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Interesting thesis from 1953: https://trace.tennessee.edu/cgi/view...t=utk_gradthes

This is building a tube based rectifier and regulator - 400V in 300V 300mA out.
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Old 19th December 2020, 02:20 PM   #280
NickKUK is offline NickKUK
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High voltage and PBCs - IEC tables indicating minimum distancing for PCB tracks, covering both air conductivity given non-dry air, and PCB conductivity: Creepage vs Clearance ~ PCB Design Tech Guide
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