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1AG4 Direct Heated Pentode, Output
1AG4 Direct Heated Pentode, Output
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Old 18th February 2012, 08:08 PM   #11
DavesNotHere is offline DavesNotHere  United States
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Join Date: Jun 2011
Oh yea, I forgot my DI box project where I used phantom to power the tube. used a resistor-led tied off from phantom and put the heater across the led. My output circuit was SE, 12K output impedance, 1.3mA
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Old 18th February 2012, 09:19 PM   #12
TheGimp is offline TheGimp  United States
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Join Date: Aug 2009
Location: Johnson City, TN
Interesting DavesNotHere,

I tried battery power and found the current source to be as quiet (at least in measurement). I will probably give it another try when I do the listening tests.

Right now I'm running 30V B+, but I tried 60V and got basically the same results (maybe in part due to this being a LTP with a current source in the tail)?
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