Sunday, December 27, 2009

What are you talking about

Many people talking about mid bass, mid high and etc but are they referring the same frequency that they are talking about?

To cut the confusion, here is the refer frequency range:


Tuesday, December 15, 2009

Speaker Maintenance

Can you see how delicatel this person pamper the speaker. Actually there is story behind this.This actually happen while we are trying to “poison” a guy into ls3/5a. After letting the guy listen to 11 and 15 ohm black tag rogers. We just show the guy how to take care of ls3/5a.

A english lemon oil is the recommended to rub on the speaker cabinet. You can use other natural oil but it might further make your speaker darker especially walnut. This English lemon oil is not so oily compare to others and according to Bluesea:

1)Rub off any dust and then use a fine cloth and apply the oil to the cabinet.
2)After this rub it with your bare hand and this will let the speaker cabinet soak more.


Sunday, December 6, 2009

Which power tube?Shuguang EL34B,Electro Harmonix EL34,Reissue MULLARD EL34,Reissue Gold Lion KT88,Treasures 6ca7-z,Ei KT90 ,Groove Tube EL34m , 6CA7

Shuguang EL34B
Electro Harmonix EL34
Reissue MULLARD EL34
Reissue Gold Lion KT88
Treasures 6ca7-z
Ei KT90 (Not in production)
Groove Tube EL34m , 6CA7(no longer listed on groove tube webpage).

First i have to say i have tested or listen to the above tube either in my own system, friends or in dealer system and not the result is not conclusive.
I would categories them under 2 batch distinctively by the origin of the tube.
I found even with the claim of different design I still find the sound characteristic is almost the same.
The first batch will be from China Shuguang that are more tonally pleasant but with bloated bass and sound “dirty” at the high.
This category of power tube is more suitable for small speaker or speaker with tight bass.In my system base on ls3/5a, i tends to favour this group.
This including the:
Treasures > GT 6CA7 = > GT EL34m(1ST BATCH)  => SHUGUANG EL34B

The second category will be from Russia.The sound is thin withn tight bass.Full range or big speaker tends to favour this group of power ube.
I also put the EI kt90 under this category as the sound is much closer to this category:

Ei   >    Gold Lion   =>   mullard   >     EH

>      BETTER

I found that more better i rank  is usually improve on the dynamic and sound less "dirty".
This might lead to improve imagimg , soundstage and etc.Tonality is usually the same even with the claim of different design.