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Old 27th July 2014, 09:44 AM   #1
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Default best operating points for e182cc tube

hi,
im trying to find the best operating points for the e182cc in dac output stage,
im using pcm1704 dac chip conectec to a pot. (volume control) and than straight to the grid of e182cc tubes through 1k resistor in series,
-grid resistor (to ground) at the moment is 360K.
-cathode resistor 330R
-anode voltage 220V
-current .around 13ma
....if you have any comments or suggestions please let me know.
best,k.
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Old 27th July 2014, 01:02 PM   #2
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You have forgotten to state your anode resistance, and also if the tube is supposed to be working as a buffer or a amplifying stage.

If the latter, have you bypassed the cathode? This will give you more gain.

Anyway, the E182CC can handle some power, however I would use it quite conservatively. There is little point in running this tube that hard.
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Old 27th July 2014, 01:22 PM   #3
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hi v4lve lover,
thanx for your reply,
the anode resistance is 8kohm
tube is working as amplifying stage
no cathode bypass
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Old 27th July 2014, 02:53 PM   #4
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Hi,
I have operate the tube at 120V@20mA with a CCS.
Btw when you run the tube hard only use one half. When it gets to warm it sounds strange. This goes for the 5687 as well.
When using a CCS as load you can take the cathode C out.

Best
Karsten
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Old 27th July 2014, 03:15 PM   #5
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Why would you only use one half?

Why not just load both halves whit a CCS set at 5-7mA?
that way you are not heating one side you won't use
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