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In Reply to: RE: Reading Plate Characteristic Charts - Question posted by Maxamillion on July 01, 2009 at 09:00:23
Avoid that 0 line on these little triodes...
Thanks for the reply! Is that also true of Plate Volts as well?
Yes indeed!
In regards to dialing in plate voltage, maybe I can offer an easier solution. Put two HLMP-6000 diodes under your cathode. That fixes your cathode voltage right around 3v, which is a decent place for a preamp.
Now put a 100k pot in as your plate load, dial in plate voltage, and replace with a resistor.
The diodes offer low impedance to ground, and they don't require bypass caps. Also, you only end up having to juggle one part.
Hmm, yes, I've been reading about diode biasing (so much to learn on this subject!). The cathode resistor on my preamp is bypassed with a relatively large Oscon cap (220uF, I think I recall), which can't be too good for the sonics, even if the Oscon is considered a pretty good electrolytic.
If I did this, would I lose any of the advantages of having a bypassed cathode resistor, such as increased gain and no negative feedback?
You may lose a little gain, but I don't think you will pick up and local feedback from this arrangement.
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