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In the Forum: Melquiades Amplifier
In the Thread: A resistor between screen and grid
Post Subject: Gas, bass, jazz...Posted by Romy the Cat on: 3/26/2007

 ml8 wrote:
If you think gas regulators make sound of 6E5P so nice, didn't you try putting gas regulator tube in the grid of the 6C33C, and why?

Sure, I trued. It sounded very bad. I pull out of my butt any imaginable rational with explanations but the core will be the same: I have no idea why the gas buffers did not sound well with 6C33C

 ml8 wrote:
You are heavily filtering bias voltage with LCRC filter.  But you're using gas regulators, which are supposed to filter the ripple very well.  So, do you need this additional LCRC filtering at all?

No, it is not necessary to heavy filter the bias before gas tube. As you see the negative voltage is being used to provide bias for output stage and it should very severely “derippled”. Since I generally tend to have an input choke after diode the design of the negative shoulder was obvious. The positive and negative voltages are sourced form the same bridge and to keep the bridge even-loaded I used the same filter entrance for the positive side. Yes, it is not really necessary and did proposed to peoples to simplify the positive supple by taking the voltage for the gas tube form the B+ of the first stages, In fact I had one Milq made exactly like this…

 ml8 wrote:
How does sound of your amplifier change when you extract gas regulators from sockets? As far as i understand, there should be no problems (technically speaking) running Melquiades without them, as all voltages should not change...

Well, I’m sure what you intend as is not exactly what you asked. The gas tube has 200V to “light up” in Milq and jut pulling the tube affects the bias of the fist stage. What you most likely are asking is how the first stage sound in that way how it being used in Milq compare with negative voltage is taken juts out of regular, not gas-decupled power supply. The answer is: very much different. I have writhe about is a many places at this forum - you might search. Do not think about the gas tube as a voltage source but rather think about it as a very delicate absorber for the 6E5P’s grid currents…

 ml8 wrote:
So sometimes i just wonder why do you need 6C33C at all, with your high-sensitive speakers.

Your point is well taken:

http://www.GoodSoundClub.com/TreeItem.aspx?PostID=4063

and from time to time I ask myself this questions. Dima made it, driving his speakers, so I did it in past in Milq’s headphone versions…. The perfectly see the logical rational behind it but it should be trued and the results should be assessed… It takes time… I am planning to do it …if the upcoming Zaratustra II will turn out to be able sonically compete with the Super Milq’s LF section…

Rgs, Romy the Cat

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