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jamesrm618 wrote:

I wonder if this will resemble your final results

Actually….it does look like I am on something with this Baby Melquiades project.

First of all it is not Baby Melquiades anymore as it become too far deviation from Melquiades. Therefore I would not call it this way anymore.

I spent yesterday a good part of the day training got make this 6C19P based headphone amp to sound correct or at least interesting but it was fruitless.  It was very high quality punchy and dynamic sound but it was completely amusical. It sounded like the tube was practically idling, having no harmonics. In fact the 6C19P was loaded quite aggressively at 2.800 Ohm. Still I feels like the tube wanted to be loaded even more. Since I did not have the “room” in the transformer anymore (LL1623A in F configuration) and the 3Kohm against the plate’s 500R sounded like “good enough” I was wondering if I was operating at the sound that the 6C19P is capable to give up.

Close to the end of the day I called to Dima and was bitching about the headphone amp’s sound using all possible illustrations and associations and describing why I do not like it. There were many “other things” that we could try but I was very skeptical as the direction where we could go sonically was not something where I felt might be a correct direction. Suddenly an interesting idea came to the Dima’s head and he suggested that from what I was saying he feel that injecting a positive feedback into the amp might be very beneficial. We took voltage from 1/8 of the secondary and… O wonder!… it feedback moved sound to very interesting direction. Suddenly the full of space, lush and wonderfully-slow presentation that I was looking for had happened “by chance”… A direct hit!

I am not saying that this headphone amp sound how it should be but at this point it’s potency made very enthusiastic for me to work on this amp. There are some other aspects that I need to resolve (for instance plugging the STV 280/40 or any other high voltage regulator) but at this pint the “new” headphone amp begin to look promising.  I think I need to deal with a need to build the proper sounding headphones should be next… :-)

Rgs,
The Cat

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