Screen Voltages

[Structo]

For the guys that run a choke in their 100w ODS amps, is your screen voltage at pin 4 of the 6L6, less than your plate voltage at pin 3?

I ask this because in my amp, the voltages are virtually identical.
That is they are both 433v.
I used a Magnetic Components choke that is spec'd at 4 henrys @ 90ma.
I don't know what the DC resistance is.

I have 6W 500 ohm screen resistors on each socket.

I haven't checked to see what the screen voltages do once I am playing through it, only at an idle.

Is this something to be concerned about, as in, am I harming my power tubes by having the screens the same voltage as the plates?

I thought the idea was to have the plates more positive than the screens for cleaner operation.

Thanks for any input.
Tom

[mlp-mx6]

Is your meter True RMS?

[Structo]

Yes

[mlp-mx6]

My 100W w/ choke measures about 1V lower on the screens, and runs fine.

I simply take that to mean that there is not a lot of screen current (or downstream in the PS either) to pull the voltage down.

[ChrisM]

Didn't you ask this before on your D'lite? Like I think you said the screens were only 2-3V below.

Anyways thats normal. They will drop while playing.

[BobW]

FWIW, It doesn't matter if you have a true RMS meter when measuring voltage from a DC source.

[David Root]

Both my D-style amps have chokes and they do the same thing Tom, I would only be concerned if the screen was higher than the plate.

[Structo]

Thanks guys!