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In the Forum: Melquiades Amplifier
In the Thread: The short "6C33C Survival Guide".
Post Subject: It is very simple.Posted by Romy the Cat on: 4/27/2012
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 son wrote:
Hallo Romy, i'm interested with half triode at 6C33C , but im confuse how to set it,... 
Full Triode : pin 1&2 give 6,3v , pin 6&7 give 6,3v.
Half Triode : series pin 2&6 1&7 give 12,6v or just use pin 1&2 give 6,3 v
thanks before...
It is truly very simple. Use ether pins 1&2 or pins 6&7, dive it with 6,3V. I mean you need to use only one set of heaters and this will bring your tune to half-anode mode. Drop your plate current to ~65% of what you use to have. Be advise the you will lose ~3dB power (in fact less than 3 dB and will rave twice higher pate impedance. If you would like to maintain the same loading of your pate (I would) then you will lose 3dB of gain by transformer ratio. If you have only 12,6V PS for your amp and stereo configuration chassis then you can connect your half triode 6C33C in series. It is a good question to ask: which side to disconnect: left or right. I was not able to detect which one is better. I would advise to use the side that has better cooling and farther from any cooling obstacles. Another rational would be to sue the side that is easier to wire from under hood and that further from your signal paths.

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