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In the Forum: Melquiades Amplifier
In the Thread: Headphone amplifiers. Baby Melquiades?
Post Subject: Driver tubesPosted by Chirag on: 12/3/2005

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 Romy the Cat wrote:

Hey, Chirag, long time no see.


Hi Kitty,

I always try to see whats going on on this site, but by the end of the day I'm usually too bloody tired to think clearly enough to write something of interest.  This weekend is finally about watching some college football and making some delicious enchiladas.  Its so wonderfully normal after living in a smelly hospital!

 Romy the Cat wrote:

I feel that 6E5P has own very interesting “puss” as Tony Soprano would describe it. This “puss” has something to do with dynamic viscosity and with its ability to sound “dynamically inelegant”....Some people see Melquiades as a 633C-base amp but I see the Melquiades as two stages SET with 6E5P driver...(if I am not mistaken about those PP) and he clamed that all of the amps, though sound differently still were able to express the 6E5P’s signature....And since the 6E5P has quite a lot of own power (8W plate dissipation) then it asked to try it….


The output tube/transformer is obviously important, but all my experimentation shows the amplifying devices determine most of the "sound" of any amp.  I don't always consider it a musically neutral device, but I found the 6900/5687 tubes wonderful in my very basic EL84 amp.  Even the so called good NOS output tubes are nothing without the very good driver tubes inserted. 

The 6E5P is an interesting device (I did some research after you dropped the "tetrode" hint and bought a few :-)), but the bias scheme with the OA2's is still incomprehensible to me.  Either way, your results with this driver setup would be fan to replicate in a headphone amp or even a PP.  My little Tannoys do satisfyingly well with the mediocre output of the PP amp, but the added power of a 5881 or KT66 tube in a Mullard type circuit (with 6E5P driver pentode) might be interesting.

 Romy the Cat wrote:

I hope the trans arrive near the end of the year or in the worst case in January. I will let know how it would turn out to be....Still it has some “signs” that it preserver the 6E5P’s puss.


That 8w dissipation is almost like using a power tube to drive an even bigger power tube in the big Milq.  The mathematically more correct iron should be an eye opener on the characteristics of the tube "as-is".

 Romy the Cat wrote:

Still I do not know if I would be an objective judge in your case as I did not research the subject of headphone amplifies dearly and do not have a lot of experience with them.


Maybe not, but there is going to be more honesty on your end with regards to pure results than most of the guys on those horrid headphone forums.

 Romy the Cat wrote:

If the 6E5P amp would not "do" then I would try in some way the similar amp replacing the 6E5P with 6C19P...


Figuring out another driver stage for the 6C19 will be quite a chore after getting spoiled with this 6E5P/OA2 scheme (unless you mean 6E5P->6C19 amp).

Regards,
Chirag

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