Yaqin MC-5881A amplifier improvements - Page 9

SplatPantZ · 10th January 2008, 08:45 PM

Quote:

Originally posted by salas
I would smack the living daylights out of those luna park 6E2s!

Just wondering Is there a problem with it's Magic Eyes?

Salas · 11th January 2008, 12:24 AM

No! Its just humor because I don't like flashy gimmicks on a tube amp. It degrades it aesthetically IMHO.

gingertube · 11th January 2008, 01:22 AM

Not entirely just humour.

On a Music Angel EL34 PP Amp I had, I thought pulling the magic eye tubes (and deleting the associated circuitry) improved the sound.

Cheers,
Ian

Salas · 11th January 2008, 11:16 AM

Could be drawing some current or reflecting some signal. With good resolution source and speakers, yes it may be a little audible.

SplatPantZ · 11th January 2008, 05:38 PM

Ok thanks, Thing is mine rarely bounce as its loud in our bedroom before they get active! (still talkin about the eyes that is )
Using Mordaunt Short 902i's 89db.

DanDini · 9th February 2008, 05:16 PM

I've started to write up my findings on the various Yaqin models I've had here:

http://www.slickpepper.dyndns.org/valve-tube-amps

It's sparse at the moment, but I will add more.

Cheers,

Dan

fossil2k · 14th February 2008, 11:48 PM

Quote:

Originally posted by gingertube
More complex mods:
Make up a little "matrix" board with a cascode transistor current source (or ring of two transistor current source) to replace the 30K/2W tail resistor in the driver stage and make the 2 anode loads the same - both 47K would be good.

Use separate cathode bias resistors and bypass caps for each 5881.

Cheers,
Ian [/B]

Hi Ian, can you explain more of the above? Is there any schematics? Thanks.

gingertube · 15th February 2008, 03:16 AM

Hi,
Did'nt have time to do much but have scribbled some current sources on a piece of paper which would suit.

Cheers,
Ian

fossil2k · 15th February 2008, 07:55 AM

Thanks Ian. Will try once I have my hands on these components. By the way, what do you think of these China tube amp? I've compared with Marantz PM4001 & Aura and I feel that there is something missing in the songs played with 5881. Its like there is no life in it???

Salas · 15th February 2008, 06:31 PM

See about substituting the stock gray coupling caps with something good, and you will get some expressionism in its sound. Also see for Blackgate FK instead of the stock cathode bias bypass output stage caps.

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11th January 2008, 12:24 AM	#82
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No! Its just humor because I don't like flashy gimmicks on a tube amp. It degrades it aesthetically IMHO.

11th January 2008, 01:22 AM	#83
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	Not entirely just humour. On a Music Angel EL34 PP Amp I had, I thought pulling the magic eye tubes (and deleting the associated circuitry) improved the sound. Cheers, Ian

11th January 2008, 11:16 AM	#84
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Could be drawing some current or reflecting some signal. With good resolution source and speakers, yes it may be a little audible.

11th January 2008, 05:38 PM	#85
SplatPantZ diyAudio Member Join Date: Jan 2008	Ok thanks, Thing is mine rarely bounce as its loud in our bedroom before they get active! (still talkin about the eyes that is ) Using Mordaunt Short 902i's 89db.

9th February 2008, 05:16 PM	#86
DanDini diyAudio Member Join Date: Nov 2006	I've started to write up my findings on the various Yaqin models I've had here: http://www.slickpepper.dyndns.org/valve-tube-amps It's sparse at the moment, but I will add more. Cheers, Dan

15th February 2008, 07:55 AM	#89
fossil2k diyAudio Member Join Date: Sep 2007	Thanks Ian. Will try once I have my hands on these components. By the way, what do you think of these China tube amp? I've compared with Marantz PM4001 & Aura and I feel that there is something missing in the songs played with 5881. Its like there is no life in it???

15th February 2008, 06:31 PM	#90
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	See about substituting the stock gray coupling caps with something good, and you will get some expressionism in its sound. Also see for Blackgate FK instead of the stock cathode bias bypass output stage caps.

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