HK 250 power amp tube amp schematic

eddog · 17th January 2006, 08:16 PM

shows avalue of a capacitor to be 20K. Is the K the tolerance (10%)percentage or does it mean 20,000(pico farads or uuf). It is used to couple the ac signal from the first half of a 6cg7 tube to the driver stage. 20 pico or 20,000 pico?

Thanks for any help provided!
Mark

Tube_Dude · 17th January 2006, 08:26 PM

Quote:

Originally posted by eddog
shows avalue of a capacitor to be 20K.

Hi eddog

The value of the cap is 20 nF ( 0,02uF ).

Cheers

eddog · 17th January 2006, 08:36 PM

Thanks tube dude, very much appreciated!
The negative feedback cap is shown as 100, so if I have this right that value is 100 pf or also known as .1 nf or less comonly today known as 100 uuf.

Tube_Dude · 17th January 2006, 08:42 PM

Quote:

Originally posted by eddog
The negative feedback cap is shown as 100, so if I have this right that value is 100 pf or also known as .1 nf or less comonly today known as 100 uuf.

Yep!

eddog · 17th January 2006, 08:46 PM

Thanks again Tube Dude

rickl · 18th January 2006, 01:36 AM

eddog,
Not sure where in Minnesota you live but if you are in the western part of the twin cities, I have some very nice 20nF caps you can have. I bought a bag of 'em and have plenty to share.

rick

eddog · 18th January 2006, 03:05 PM

Thanks for the offer Rick, I live south of Luverne,MN right near the dreaded Iowa border

This is my first HI-FI tube amp project for what it's worth. I repaired a friends 63' Silvertone guitar amp and have become fascinated by tubes and tube amp theory.
When shopping for coupling caps in the future, what should I look for to indicate a quality capacitor. Also can ceramic caps be replaced by other types of the same values?

17th January 2006, 08:16 PM	#1
eddog diyAudio Member Join Date: Nov 2004 Location: Small Town in Minnesota	HK 250 power amp tube amp schematic shows avalue of a capacitor to be 20K. Is the K the tolerance (10%)percentage or does it mean 20,000(pico farads or uuf). It is used to couple the ac signal from the first half of a 6cg7 tube to the driver stage. 20 pico or 20,000 pico? Thanks for any help provided! Mark

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17th January 2006, 08:36 PM	#3
eddog diyAudio Member Join Date: Nov 2004 Location: Small Town in Minnesota	Thanks tube dude, very much appreciated! The negative feedback cap is shown as 100, so if I have this right that value is 100 pf or also known as .1 nf or less comonly today known as 100 uuf.

17th January 2006, 08:46 PM	#5
eddog diyAudio Member Join Date: Nov 2004 Location: Small Town in Minnesota	Thanks again Tube Dude

18th January 2006, 01:36 AM	#6
rickl diyAudio Member Join Date: Jun 2004 Location: Minneapolis	eddog, Not sure where in Minnesota you live but if you are in the western part of the twin cities, I have some very nice 20nF caps you can have. I bought a bag of 'em and have plenty to share. rick

18th January 2006, 03:05 PM	#7
eddog diyAudio Member Join Date: Nov 2004 Location: Small Town in Minnesota	Thanks for the offer Rick, I live south of Luverne,MN right near the dreaded Iowa border This is my first HI-FI tube amp project for what it's worth. I repaired a friends 63' Silvertone guitar amp and have become fascinated by tubes and tube amp theory. When shopping for coupling caps in the future, what should I look for to indicate a quality capacitor. Also can ceramic caps be replaced by other types of the same values?

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