6c33c-b question

woody · 17th October 2011, 08:26 AM

Steve Bench had an article about using a power triode in inverted operation. I was wondering if the 6c33c could be used in inverted
mode and what the grid power rating would be in this case.

piano3 · 17th October 2011, 08:43 AM

He uses 6AS7 so why not?

Mordor · 18th October 2011, 04:01 PM

another stupid question: im making a simple se 6c33 ampl. ive founded this data: http://www.jogis-roehrenbude.de/Russ...atasheetMB.pdf but i cant find anywhere how see tube for identify pin.... from botton or from top ? Anyone can help me ?

p.s. im making this:

thank to all

artosalo · 18th October 2011, 04:56 PM

Quote:

i cant find anywhere how see tube for identify pin.... from botton or from top ? Anyone can help me ?

Data sheet shows allways the bottom view.

kevinkr · 18th October 2011, 05:02 PM

The plate is connected to the largest pin in the middle and the diagrams are viewed from the bottom. (Verified on 6C41C) It has been a long time since I had any of 6C33 tubes on hand so I can't check directly, but that is the convention the 6C41C follows..

www.mif.pg.gda.pl/homepages/frank/sheets/113/6/6S33S.pdf

In any case just look at the tube to make sure that you have not swapped the grid and cathode connections - this tube is so large that the connections are obvious when you look at it.

Mordor · 18th October 2011, 05:17 PM

thank you so much, another: in this schematic i can found some strange resistor, like 10w 400 ohm resistor on 6c33... i found a near value... why this chose in your opinion ?

kevinkr · 18th October 2011, 05:23 PM

Quote:

Originally Posted by Mordor

thank you so much, another: in this schematic i can found some strange resistor, like 10w 400 ohm resistor on 6c33... i found a near value... why this chose in your opinion ?

That is the cathode bias resistor which sets the operating point of the output stage. What is the close value you found, anything within a few % ought to be fine. Based on my recent (and unrelated) issues with failing WW resistors I would use at least a 50W resistor there. (It may be dissipating 15W or more if the plate current is close to the claimed 200mA.) I'd use one of those chassis mounted aluminum housed power resistors: http://documents.tycoelectronics.com..._1773035_B.pdf Something similar to this..

Mordor · 18th October 2011, 05:25 PM

410 ohm 12 w parallel of 2 820

kevinkr · 18th October 2011, 05:33 PM

Quote:

Originally Posted by Mordor

410 ohm 12 w parallel of 2 820

That would work, but as indicated the dissipation is pretty high..

Mordor · 19th October 2011, 06:48 AM

another, im giving 12.6 vac at filament in series with a transformer. Can i connect the middle of series of heaters to audio star gnd in order to elimiate some noise?

17th October 2011, 08:26 AM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	6c33c-b question Steve Bench had an article about using a power triode in inverted operation. I was wondering if the 6c33c could be used in inverted mode and what the grid power rating would be in this case.

18th October 2011, 05:02 PM	#5
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	The plate is connected to the largest pin in the middle and the diagrams are viewed from the bottom. (Verified on 6C41C) It has been a long time since I had any of 6C33 tubes on hand so I can't check directly, but that is the convention the 6C41C follows.. www.mif.pg.gda.pl/homepages/frank/sheets/113/6/6S33S.pdf In any case just look at the tube to make sure that you have not swapped the grid and cathode connections - this tube is so large that the connections are obvious when you look at it. __________________ www.kta-hifi.net

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17th October 2011, 08:43 AM	#2
piano3 diyAudio Member Join Date: Aug 2010 Location: London,UK	He uses 6AS7 so why not?

18th October 2011, 04:01 PM	#3
Mordor diyAudio Member Join Date: Jun 2004 Location: Venice	another stupid question: im making a simple se 6c33 ampl. ive founded this data: http://www.jogis-roehrenbude.de/Russ...atasheetMB.pdf but i cant find anywhere how see tube for identify pin.... from botton or from top ? Anyone can help me ? p.s. im making this: thank to all

18th October 2011, 05:17 PM	#6
Mordor diyAudio Member Join Date: Jun 2004 Location: Venice	thank you so much, another: in this schematic i can found some strange resistor, like 10w 400 ohm resistor on 6c33... i found a near value... why this chose in your opinion ?

18th October 2011, 05:25 PM	#8
Mordor diyAudio Member Join Date: Jun 2004 Location: Venice	410 ohm 12 w parallel of 2 820

19th October 2011, 06:48 AM	#10
Mordor diyAudio Member Join Date: Jun 2004 Location: Venice	another, im giving 12.6 vac at filament in series with a transformer. Can i connect the middle of series of heaters to audio star gnd in order to elimiate some noise?

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