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Welborne
Posts 3
Joined on 05-23-2013

Post #: 1
Post ID: 23201
Reply to: 23201
Melquiadising other amp?
Hello Roman,
Hola from Hong Kong! How are you? Haven't been here for long time. I have a question at the back of my mine for long time, and it may have been covered elsewhete in your blog before. I am asking it here but do point me to the thread if it has already been discussed.
I have read and re-read your writing and description about where the Melquiades sound come from. Especially when you compared the one stage Mel and your proper 6e5p-6c33c they seem to sound super close, which means the output 6c33c stage is very neutral and transparent and its job is to give more horse power to the Melquiades effect from the "gas tube biasing 6e5p" portion. This got me thinking..... here comes my question, naturally. Is it possible to turn a neutral low distortion "low character" sounding power amp such as other tubes or even solid state output stage into Melquiades-effect generating too by incorporating the gas biasing 6e5p stage in it?  The question I ask this is because I have been exposed to some latest class d (particularly tpa325x family from Texas Instrument) and they sound very very good, neutral, dynamic, very good soundstage, detailed....in other words Transparent. So I am thinking about a Melquiades Hybrid project....
For the record, I myself have been a huge fan of 6c33c se sound. Mine is a D3a-6c33c, and these years many gears came in and went without taking down the throne of this 6c33c. The closest and my second favourite (very very close) happens to be a tpa3255 class D put together by a friend, which has the Korg Nutube incorporated in this input stage. 
Any advice (for or against) on this idea is welcomed.
P.S. my speakers are Klipschorn,  and (my absolute favourite) a pair of open bafle using Raal 140-15d ribbon and Telefunken/Altec/Tesla drivers which I followed from Fikus's Project 24 (aka Lampizator).





04-29-2017 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,545
Joined on 05-28-2004

Post #: 2
Post ID: 23202
Reply to: 23201
Someone need to look into it.
Welborne, I do not think that I can give you an expert answer. You see, the gas tube biasing around 6e5p was in a way an accident. It was something that made the 6e5p to sound very interesting but I am not convinced that this type of biasing will be beneficial for other tubes. For instance I did try to bias 6C33C in the same way but it was very bad result. I think the things need to be experimented further. The Milq biasing implies a grid resistor biasing and the “unnecessary” gas tubes power supplies, it is possible that for some tubes only grid resistor as a “virtual battery” will work out. I never went for anything further as my objective was not to define a universal rule of amplification design but just to build an amp for myself.



"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
04-29-2017 Post does not mapped to Knowledge Tree
Welborne
Posts 3
Joined on 05-23-2013

Post #: 3
Post ID: 23203
Reply to: 23202
My fault..
Roman,
Thanks for your prompt reply!May be my last wordings have misled you. I didnt mean I was interested in expetimenting gas tube biasing for D3a or another tube. Instead, I am rather interested in putting a gas tube biased 6e5p in front of a ss amp and in my case a TI Tpa3251 class d. I have this idea after reading your impression on your one stage Melquiades vs Full Melquiades, which seems to point to the possibility that the Melquiades effect is from your 6e5p stage, if the output stage is transparent and neutrap enough....



04-29-2017 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,545
Joined on 05-28-2004

Post #: 4
Post ID: 23204
Reply to: 23203
Sure. Try it.
Indeed I did not understood you. If you would like Milq’s front end to drive something else then it is perfectly fine solution. We have it to drive 6C33C, GM70, many DH tubes, SS push/pull. I do not know about the Class D module current requirement however. I generally not a big fun of class D but the question is not about my view on class D but an ability of Milq’s driver to drive other than Milq output stage.



"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
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