On Line Tube Learning for newbies.... - Page 28

Grunnet · 16th April 2020, 09:00 AM

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 ???

Grunnet · 16th April 2020, 09:04 AM

PS. The capacitors in question are Nichicon KX.

citabria90 · 2nd August 2020, 02:27 AM

Quote:

Originally Posted by pedroskova

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

NickKUK · 27th November 2020, 07:29 AM

Ground loops
1. http://eet.etec.wwu.edu/AndyS/projec...2017%20(1).pdf
2. http://www.valvewizard.co.uk/Grounding.pdf

NickKUK · 27th November 2020, 07:33 AM

Quote:

Originally Posted by Grunnet

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.

NickKUK · 3rd December 2020, 09:55 AM

Any good links for negative feedback and phase?

Kei · 11:22 AM

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.

NickKUK · 05:26 PM

Calculating ladder Butterworth filters: https://inst.eecs.berkeley.edu/~ee24...res/L4_f07.pdf

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

NickKUK · 19th December 2020, 12:57 PM

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.

NickKUK · 19th December 2020, 02:20 PM

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

16th April 2020, 09:00 AM	#271
Grunnet diyAudio Member Join Date: May 2016 Location: Denmark	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 ???

3rd December 2020, 11:19 AM	#277
Kei diyAudio Member Join Date: Mar 2009 Location: Wales	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. __________________ 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.

16th December 2020, 05:13 PM	#278
NickKUK diyAudio Member Join Date: Dec 2019	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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16th April 2020, 09:04 AM	#272
Grunnet diyAudio Member Join Date: May 2016 Location: Denmark	PS. The capacitors in question are Nichicon KX.

27th November 2020, 07:29 AM	#274
NickKUK diyAudio Member Join Date: Dec 2019	Ground loops 1. http://eet.etec.wwu.edu/AndyS/projec...2017%20(1).pdf 2. http://www.valvewizard.co.uk/Grounding.pdf

3rd December 2020, 09:55 AM	#276
NickKUK diyAudio Member Join Date: Dec 2019	Any good links for negative feedback and phase?

19th December 2020, 12:57 PM	#279
NickKUK diyAudio Member Join Date: Dec 2019	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.

19th December 2020, 02:20 PM	#280
NickKUK diyAudio Member Join Date: Dec 2019	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