yagoolar's tube amp projects - Page 6

tinitus · 9th October 2012, 08:26 AM

Quote:

Originally Posted by yagoolar

Which one is ...

which one is what....

yagoolar · 9th October 2012, 08:43 AM

Was planning to write "correct" or "better"

yagoolar · 12th October 2012, 06:56 PM

My cat (Rudy) is checking the progress.

tinitus · 12th October 2012, 07:30 PM

Quote:

Originally Posted by yagoolar

Was planning to write "correct" or "better"

I dont know, but when you have located the grid(signal in), isnt the two other always crossing each other, so to speak

yagoolar · 07:48 PM

They are between g1 and a. But there is the question of how each of them interacts with electron flow while differently biased. I don't know. Staying with "classical" i.e. g3-k, g2-a.
After some power test I may be tempted to change.

tinitus · 12th October 2012, 08:08 PM

thought you had it triode coupled ?

but I seen the size/value of resistor to anode debated a lot

yagoolar · 12th October 2012, 08:24 PM

Triode-connected. Yes. Resistor between anode and grid stops RFI

tinitus · 12th October 2012, 09:25 PM

btw, DHT Rob have a schematic with C3g-50 amp on his site

seems he connects g2 and g3 together, and then to anode with 100R
is it different because of the IT

yagoolar · 13th October 2012, 08:47 AM

Quote:

Originally Posted by tinitus

btw, DHT Rob have a schematic with C3g-50 amp on his site

seems he connects g2 and g3 together, and then to anode with 100R
is it different because of the IT

I haven't found any measurements of triode connected pentodes with both g2 and g3 connected to anode. At another forum I have found a sound description of C3g with g2 connected to plate and cathode respectively. That is of personal taste, however.

IMHO, IT use does not imply connection presented in DHT Rob's schematic.

yagoolar · 13th October 2012, 05:48 PM

Datasheet reads U3=0V i.e. connected to cathode.
http://www.4tubes.com/DATASHEETS/SCA...-C/C3g-TFK.pdf

12th October 2012, 07:41 PM	#55
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	They are between g1 and a. But there is the question of how each of them interacts with electron flow while differently biased. I don't know. Staying with "classical" i.e. g3-k, g2-a. After some power test I may be tempted to change. Last edited by yagoolar; 12th October 2012 at 07:48 PM. Reason: Second thought

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9th October 2012, 08:43 AM	#52
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	Was planning to write "correct" or "better"

12th October 2012, 06:56 PM	#53
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	My cat (Rudy) is checking the progress.

12th October 2012, 08:08 PM	#56
tinitus diyAudio Moderator Join Date: Nov 2005	thought you had it triode coupled ? but I seen the size/value of resistor to anode debated a lot

12th October 2012, 08:24 PM	#57
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	Triode-connected. Yes. Resistor between anode and grid stops RFI

12th October 2012, 09:25 PM	#58
tinitus diyAudio Moderator Join Date: Nov 2005	btw, DHT Rob have a schematic with C3g-50 amp on his site seems he connects g2 and g3 together, and then to anode with 100R is it different because of the IT

13th October 2012, 05:48 PM	#60
yagoolar diyAudio Member Join Date: Oct 2004 Location: Mazowieckie, Jozefoslaw	Datasheet reads U3=0V i.e. connected to cathode. http://www.4tubes.com/DATASHEETS/SCA...-C/C3g-TFK.pdf