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  »  New  “Melquiades” amplifier: a year later...  Considerations about Melquiades’ layout....  Melquiades Amplifier  Forum     33  194357  10-05-2006
  »  New  A quest for a better SET...  Still, there is something in it....  Melquiades Amplifier  Forum     3  39622  02-05-2005
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02-13-2005 Post mapped to one branch of Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,394
Joined on 05-28-2004

Post #: 1
Post ID: 650
Reply to: 650
The “Melquíades” début.

It was after midnight and I returned from my urban Saturday supper.  A pair of the recently born “Melquíadeses” was sitting in the mid of the room, glowing and asking: so what? A sudden necessity of  a radical audio sadism attacked me and I said to the teasing amplifier: “Ok, suckers, you whanna action I will give you the actions and since you began to behave you better to able to handle the actions?”

I decided to put them in the real game. I placed one single Macondo’ channel surrounded by two LF towers. I powered the horns with Lamms ML2 and a pair of Woofer Towers (8X25W/8565-00 sealed drivers) I powered with a pair of “Melquíadeses”. It took a half of hours to crossover everything and equalized the volumes. I desisted to play it loud, I love loud, practically if systems can play loud, loud and good at the same time. Most of the audio systems juts can’t and as soon music jumps at the high DB scale the Sound get disintegrate. The “Macondo” can play insultingly loud, loud with no indication of brutality or vulgarity (here is when the RT-60 channels turn out to be very handy). The room can hold a loud play very well as well. Now, the question is how the “Melquíadeses” will handle it.

I ran 0.5mV cartridge with 26dB gain of transformer and 55dB of phonocorrector right into the power amps (one channels) with no attenuation at LF channel. (The composite sensitivity ~ 98-99dB) I did not measured the “Melquíadeses” gain yet but I anticipate that it is around the 22 dB -23dB in my current operational settings. So, it was kind of loud…

I played the Italian pressing of the Tchaikovsky’s Third movement of his 4th symphony from 1961, the Ivan Moravec playing Beethoven’s Pathétique in 60s, Janos Starker performing Kodaly sonata #8 in 1956 on Period, Claudio Abbado trying to play Mahler 6th with Chicago, Kirkpatrick playing Bach’s WTC in 1966 (you can’t reproduce harpsichord properly if you do not go ALL the way down!)… bunch of other jewels of great music with an important LF content…  The room responded very well with very thick LF. You know this feeling when LF become to have a tangible density in the room but still has no sensible chest pressure and still is virtually unheard sonically? You know this feeling when the pressure of sound is raises in the room but the atmospheric pressure of LF waves still is not detectable? What it was!

The  “Melquíadeses” did surprisingly OK. Probably the quote from  “Master and Margarita” would describe it correctly: “This whisde Margarita did not hear, but she saw it in the moment when she, together with her fiery steed, was  thrown some twenty yards away.  An oak tree beside her was torn up by the roots, and  the ground was covered with cracks all the way to the river. A huge slab of the bank, together with the pier and the restaurant, sagged into the river.  The water boiled, shot up, and the entire excursion boat with its perfectly unharmed passengers was washed on to the low bank opposite. A jackdaw, killed by Fagott's whistle, was flung at the feet of Margarita's snorting steed.”

Still something suggests me that I would add 40-60Voilts to the plate voltage of the output stage… hate myself for thinking this way… but it was a post in the Audio Forum. I probably should stop to suffer form all this craziness and go back to the Musical Forum?

:-)

Anyhow, It looks like “Melquíades” is not virgin anymore and it keep proving that it might handle the job.

Rgs,
The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-13-2005 Post does not mapped to Knowledge Tree
cv
Derby, United Kingdom
Posts 173
Joined on 09-15-2004

Post #: 2
Post ID: 652
Reply to: 650
patience...
Intriguing Romy, look forward to hearing more.

Before you go raising the plate voltage, you might want to give the OPT a chance to break in, particularly if it's new and especially so if it's an amorphous type...

cheers
02-13-2005 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,394
Joined on 05-28-2004

Post #: 3
Post ID: 654
Reply to: 652
I demonstrated patience too long!
Well, Chris, my transformer is amorphous type but I would have difficulties to comment about the  progress of the burning. For the first couple weeks when “Melquíades” was born I have difficulties to “get” how to load the output stage properly and juts recently Dima educated me about this whole subject. Since the begging, when the amps did not operate in the way how I'd expected, they were running day and night ( I shut them down juts to tune something). So, I feel that they should be more or less burned-in. Also, the burning-in of that amorphous code should affect primary HF – the zone where I did not run them this time....

BTW, I do not know if it's due to the transformer, or if it's due to kinky driver stage, or if it is due to the PS but what this baby dose with HF is very-very fascinating. I never had seen any SET with no feedback do anything like this. When I run it with my generator and scope I got the upper –1dB at 88KHz but I do not really know (or care) what it would mean. The spectral analyzer shows more reasonable response (image below). Subjectively, the strength and confidence with which the amp is going up into the dynamic range and into the HF frequency range is absolutely remarkable... and this is the only what maters to me.

SecondTrans.jpg


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-14-2005 Post does not mapped to Knowledge Tree
cv
Derby, United Kingdom
Posts 173
Joined on 09-15-2004

Post #: 4
Post ID: 655
Reply to: 654
Re: I demonstrated patience too long!

Ok, so should be burned in nicely.
 
There are some theories around how mylar and similar interwinding materials (as used by Lundahl, if that is the OPT you are using) can need a fair bit of run in. This is more of an issue on eg input transformers where voltages are low so the dipoles in the dielectics don't get much of a kick.

-1db at 90k is a figure one can be proud of, but not actually all that surprising given the 6C33 and a solidly engineered design, which you obviously have. The 6C33 needs a fair bit of current from the driver stage, not to mention low impedance, so will be interested to hear how you are running the 6--oops, almost gave away the driver valve, if it's the one I think it is... Now if you'll excuse me, there are some more laundromats I have to trawl through.

cheers

02-19-2005 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,394
Joined on 05-28-2004

Post #: 5
Post ID: 666
Reply to: 655
Melquíades: here they come…

 

The amps are sitting on the Kevin Tellekamp’s platforms from “Silent Running Audio”

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-21-2005 Post does not mapped to Knowledge Tree
guy sergeant
United Kingdom
Posts 258
Joined on 08-03-2004

Post #: 6
Post ID: 667
Reply to: 666
Re: Melquíades: here they come…
Nice to see the glow tubes. Shunt reg for the driver or something else?
What type of rectifier/smoothing do the amps use?
02-21-2005 Post does not mapped to Knowledge Tree
Antonio J.
Madrid, Spain
Posts 269
Joined on 08-16-2004

Post #: 7
Post ID: 668
Reply to: 667
They look very nice

and I suspect they make music quite well too.
Could you comment in what things do you find them better than the Lamms and in what things they might be worse? Just curiosity, I'll never have any of both, ha ha ha ha.

Regards,

Antonio

02-21-2005 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,394
Joined on 05-28-2004

Post #: 8
Post ID: 669
Reply to: 667
Re: Melquíades: here they come…
 guy sergeant wrote:
Nice to see the glow tubes. Shunt reg for the driver or something else?
What type of rectifier/smoothing do the amps use?

Nope, the both B+ are choke regulated. The positive and negative shunt regulators used in bias supply.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-26-2005 Post does not mapped to Knowledge Tree
beemer
Posts 5
Joined on 08-01-2004

Post #: 9
Post ID: 683
Reply to: 669
Re: Melquíades: here they come…
Wow:

Looks like a trip to Boston coming on for the big guy once the snow is gone.

Very interesting doings there Romy!

Your cat is looking well, and the amps are eye candy. I can only assume the sound equals the appearance.

Time will tell, hopefully I'll be able to find a place to park.

BTW, I just acquired a Levinson 32 preamp with phono stage. It's possible a turntable may be in my future. 

Best,

Paul :-)
02-05-2011 Post does not mapped to Knowledge Tree
ArmAlex
Iran
Posts 75
Joined on 02-15-2009

Post #: 10
Post ID: 15536
Reply to: 666
Building the amp
fiogf49gjkf0d
Dear Romy, after a lot of delays I finally found someone technical to build Melquiades. I'm afraid that I may disturb you a lot with questions.Anyhow the first question is:for some of resistors no value for wattage is mentioned like R4,R5,R6...R9,R10. What are correct watt for those resistors?Armen 
02-05-2011 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,394
Joined on 05-28-2004

Post #: 11
Post ID: 15537
Reply to: 15536
Your builder shall know.
fiogf49gjkf0d
 ArmAlex wrote:
Dear Romy, after a lot of delays I finally found someone technical to build Melquiades. I'm afraid that I may disturb you a lot with questions.Anyhow the first question is:for some of resistors no value for wattage is mentioned like R4,R5,R6...R9,R10. What are correct watt for those resistors?Armen 

If you show the circuit to you builder and he asked those question then I would keep looking for other builder. The resistor you ask care no current – your builder shall understand it. Anyhow, the universal rule is that if current not specified then use 1/4W CMF-60/DN-60 Dale resistors.

The Cat


"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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   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  “Melquiades” amplifier: a year later...  Considerations about Melquiades’ layout....  Melquiades Amplifier  Forum     33  194357  10-05-2006
  »  New  A quest for a better SET...  Still, there is something in it....  Melquiades Amplifier  Forum     3  39622  02-05-2005
  »  New  Melquiades: too early for a verdict?..  Non-Melquiades amplification: not good anymore.......  Melquiades Amplifier  Forum     6  62469  03-27-2005
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