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Old 19th June 2019, 06:20 PM   #31
randytsuch is online now randytsuch
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Originally Posted by itsikhefez View Post
Okay so I've learned that this specific panel meter is connected in parallel, so switching is easy. It can't work with the TSE though since it requires a cathode bias resistor
You really want a voltage meter, and then measure the voltage across R28 and 18.

I added test points on my top panel to provide access to the voltages/bias

My system is here
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Old 19th June 2019, 06:31 PM   #32
itsikhefez is offline itsikhefez  United States
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Installing panel meters on an SE
Yea, that makes total sense!
Whether justified or not, I am slightly concerned on putting the current meter in series.
I'm looking for a 0-500mV, or 0-1V meter for this purpose.
Potentially will use a single meter on a switch between L-R as in the photo
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Old 22nd June 2019, 12:25 AM   #33
Ritchie is offline Ritchie  Canada
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If using a 0-100mA meter on the tse, one for each triode. Would it be better to place it in series from the cathode to ground rather than in series with the anode. You would have to open the circuit board trace to do this.
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Old 22nd June 2019, 12:47 AM   #34
Tubelab_com is offline Tubelab_com  United States
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You can't separate the filament circuit of the two output tubes without two separate filament supplies. This would require a custom power transformer (two filament windings) and two rectifier / filter / regulator circuits. Unless you plan to redesign a good part of the amp, the meter must go in the plate circuit.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 22nd June 2019, 01:35 AM   #35
Ritchie is offline Ritchie  Canada
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Yes I have two separate filament supplies,though I would prefer to place the ammeters where R18 and R29 are. Are there any issues with this method other than the meters being rated for the voltage?

Thanks George
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