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Old 25th September 2010, 04:11 PM   #11
M Gregg is offline M Gregg  United Kingdom
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Another thing I do is keep the input cap as close to the input tube base as I can without picking up heater hum!
Also screen the input cable!

Also I put a 50K across the input to stop it floating!

Each resistor across an input / output, will be in parallel so 50K becomes 25K after connection!

Last edited by M Gregg; 25th September 2010 at 04:16 PM.
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Old 26th September 2010, 12:02 AM   #12
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Perhaps this is slightly OT,but what is the function of D1?
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Old 26th September 2010, 02:19 PM   #13
DF96 is offline DF96  England
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Yes, what is D1 for? A diode is often put in this position in a DC coupled design with SS power supply, to stop the grid from being dragged too positive before the previous valve has warmed up. In normal operation it is reverse biased and has no effect.
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Old 26th September 2010, 07:11 PM   #14
Arnulf is offline Arnulf  Europe
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Ugh, it's a relic in schematic which hasn't been fixed along with few other tidbits that I have mentioned already. It isn't present in the actual circuit, and neither is C3.
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