Where to put the meter

brucetassin · 10th December 2012, 11:13 PM

Hello

I'm building an RH-84 with 6V6/6SL7 tubes.
I would like to monitor the current of each output stage.
Which place ( A B C D in red) would be the best to use?

Thanks

artosalo · 11th December 2012, 07:03 AM

Do you mean quiescent current ?
During operation the average current is quite constant since 6V6 operates at class A.
This means that the A-meter reading stays almost in place.

I would use "B" and measure the voltage at this point.

DUG · 11th December 2012, 11:15 AM

"I would use "B" and measure the voltage at this point. "

I agree

brucetassin · 11th December 2012, 01:16 PM

Sorry, I did not make my question clear.
I want to mount 2 meters on the chassis and
monitor the current of each 6V6 at all times.

Thanks

artosalo · 11th December 2012, 04:10 PM

These meters can be used to observe the quiescent current of both 6V6, but as I said, the reading do not vary according to the output power like happens with AB-class push-pull output stage.

20to20 · 11th December 2012, 04:52 PM

The maximum input voltage rating of the meter may be the deciding factor. If your B+ is higher than that you won't be able to use the tranny-side circuit.

brucetassin · 11th December 2012, 07:34 PM

Thanks Artosalo.
Your point finally sunk in.

oshifis · 11th December 2012, 08:27 PM

Here is my solution:

http://picasaweb.google.com/lcsaszar/807_amplifier

20to20 · 11th December 2012, 09:58 PM

Quote:

Originally Posted by brucetassin

Thanks Artosalo.
Your point finally sunk in.

The meters would look cool, though. And you would be monitoring an important tube/amp health factor.

jjman · 12th December 2012, 12:31 AM

If they are ammeters so they need to be in line with the current. I would cut the wire below the "5w" and wire them in there. This would include the screen as well as the plate current. Although the pcb makes that easier said than done.

11th December 2012, 11:15 AM	#3
DUG diyAudio Member Join Date: Jan 2003 Location: mississauga ontario canada	"I would use "B" and measure the voltage at this point. " I agree __________________ Doug We are all learning...we can all help

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11th December 2012, 07:03 AM	#2
artosalo diyAudio Member Join Date: Feb 2010	Do you mean quiescent current ? During operation the average current is quite constant since 6V6 operates at class A. This means that the A-meter reading stays almost in place. I would use "B" and measure the voltage at this point.

11th December 2012, 04:10 PM	#5
artosalo diyAudio Member Join Date: Feb 2010	These meters can be used to observe the quiescent current of both 6V6, but as I said, the reading do not vary according to the output power like happens with AB-class push-pull output stage.

11th December 2012, 04:52 PM	#6
20to20 diyAudio Member Join Date: Jun 2010 Location: W-S, NC	The maximum input voltage rating of the meter may be the deciding factor. If your B+ is higher than that you won't be able to use the tranny-side circuit.

11th December 2012, 07:34 PM	#7
brucetassin diyAudio Member Join Date: Dec 2005 Location: Loganville, GA	Thanks Artosalo. Your point finally sunk in.

11th December 2012, 08:27 PM	#8
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	Here is my solution: http://picasaweb.google.com/lcsaszar/807_amplifier

12th December 2012, 12:31 AM	#10
jjman diyAudio Member Join Date: Jan 2009	If they are ammeters so they need to be in line with the current. I would cut the wire below the "5w" and wire them in there. This would include the screen as well as the plate current. Although the pcb makes that easier said than done.