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Old 11th December 2012, 12:13 AM   #1
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Default Where to put the meter

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
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File Type: jpg RH-84-6V6-A.JPG (33.3 KB, 242 views)
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Old 11th December 2012, 08:03 AM   #2
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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.
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Old 11th December 2012, 12:15 PM   #3
DUG is offline DUG  Canada
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"I would use "B" and measure the voltage at this point. "

I agree
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Old 11th December 2012, 02:16 PM   #4
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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
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File Type: jpg met-1.JPG (33.7 KB, 182 views)
File Type: jpg met-2.JPG (51.9 KB, 178 views)
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Old 11th December 2012, 05:10 PM   #5
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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.
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Old 11th December 2012, 05:52 PM   #6
20to20 is offline 20to20  United States
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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.
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Old 11th December 2012, 08:34 PM   #7
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Thanks Artosalo.
Your point finally sunk in.
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Old 11th December 2012, 09:27 PM   #8
oshifis is offline oshifis  Hungary
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Here is my solution:

http://picasaweb.google.com/lcsaszar/807_amplifier
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Old 11th December 2012, 10:58 PM   #9
20to20 is offline 20to20  United States
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Quote:
Originally Posted by brucetassin View Post
Thanks Artosalo.
Your point finally sunk in.
The meters would look cool, though. And you would be monitoring an important tube/amp health factor.
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Old 12th December 2012, 01:31 AM   #10
jjman is offline jjman  United States
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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.
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