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In the Forum: Melquiades Amplifier
In the Thread: GM70 vs. 6C33C
Post Subject: The GM70 SETPosted by Romy the Cat on: 4/26/2012
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Well, as I understand there is no truly GM70 vs. 6C33C context yet (sound in the respectfully equitable load) from you and it will be very interesting to hear from you when you feel that you are ready to say something. As I understand they are the same topology amps only with different PS to care the output tube’s plate voltages. Do you feel that both GM70 and 6C33C amps have the same quality output transformers respective to own pate impedance? In my estimation if everything is made properly then the cost of GM70 OPT shall be as high as the cost of the whole 6C33C amplifier….
About the driver – you know my agenda: I would like you to try my 6E5P driver in the configuration I use for Milq. If you even go there than let me know. Sine you have 3 stage design then you might try what Russians frequently use to drive GM70: 6N6P or 6H30. Bothe tubes are very good sounding current driver’s ether as gain stage or as cathode followers.
I also not a huge fan of oil & film cap used for B+ instead of electrolytic. For my low voltage designs (sub 450V) I experimented a lot with oil and film and oil with paper caps and I never find them to sound satisfactory. They sound to me “too defused” and make lower octave too “mushy” if I might say so and I always prefer sound of good electrolytic. I do not like even film-only caps for PS. I know many people would disagree however. For sure in your case dealing with 1100V in plate it is hard to find electrolytic but if I were you then I would go over the considerable expense and went for electrolytic.
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