AUDIOLAB 8000A Modification

Hi,

I've Audiolab 8000S also, anyone can post the photos and parts list for modding 8000S please?

Thanks

Dear WINDWSS,

Very detail instruction on modding 8000S, looking for those information long time, can start my modding project and thanks a lot.

I have some problem about :

C) Change the OPAMP to a better 1, any good suggestion on which OPAMP I can use (below $500)?

E) Change the evok film cap especially the 0.1uf, any cap (below $300) better than MKP1837?

Not familiar with the those OPAMP and cap model number, need some help.


Sugargar

Hi WINDWSS,

I've some photos on my 8000S and need some help:

1) The duel OPA model of my 8000S is L272M RRJXR70B, can it replaced by single OPA 627 x 2 ($150 each)?

2) I've found 2 x Elna 100uf 35V, CE-BP, Cerafine (CE85-9840) capacitors which is red colour, is it polar or non-polar? can I replace it with 2 x blackgate STD 100uf 50V capacitor?

3) I've found capacitor on the board which as the following:
  - 470uf,16V x 4
  - 470uf,35V x 2
  - 100uf,35V x 5
  - 47uf,16V x 2
  - 22uf,35V x 4
  - 10uf,16v x 2
  - 4.7uf,50v x 2
  - 4.7uf,63V x 5

Do I need to replace all of the above capacitor to blackgate std with the same uf? or just replace some important capacitor will be enough?

4) From the photo you can see there is small metal box have word "Audiolab" on it, what parts is inside? is it risk to open it to check what capacitor need to change inside?

Need some advice, Thanks

Dear WINDWSS,

My 8000s is the new china made silver casing version, maybe I will just replace those cap under 100uf to BG std 1st and skip the OPA.

Thanks for your advice

Sugargar

Dear WINDWSS,

I've re-checked my 8000S and got 3 photos of my OPA, Elna 100uf red cap and whole PCBboard.

I fouund the OPA is A2134PA, can I replace it with OPA627 x 2? or LM4562NA, any better OPA can be used?

I can't find any -ve sign or (N) word on the 100uf 35V Elna Cerafine Red colour Capacitor and I've measured the diameter of the cap is 16mm . Do you think it is non-polar cap?

Need some help, Thanks

Sugargar

Dear WINDWSS,

Have change the default OPA to 627BP x 2 and changed 470uf cap x 5pcs., the resolution improved a lot!!, now just waiting for 100uf BG cap.  and some rifa and ero mpk caps.

I cannot find a good cap to replace default Elna 10000uf and want to use your method  " pararell a 0.47uf/50v blackgate nx-hi-q with 10000uf Elna Cap"? but can you teach me how to pararell?  need to buy 2 x 0.47uf cap?


Sugargar

Hi all,

Finally completed my 8000S upgrade project, changed the following things:

Cap >470uf (Nichicon KZ)
Cap  100uf (Blackgate FK) (Blackgate Non-Polar)
Cap <100uf (Blackgate PK)
Cap <1uf (Rifa, Evox MPK)
10000uf Cap (Jensen 63V)
OPA > (627BP x 2)


The quality is excellent, sound more clear, natural  and musical a lot.

Dear all,

I'm going to try bi-amp by adding Audiolab 8000P but have the following questions:

1) In watching movie, I'm using Onkyo 703>> AVbypass (Audiolab 8000s) >> Linn Katan Bookshelf speaker.  Can I add a 8000P to bi-amp push the speaker and still can function well on the AVbypass?

2) As my Audiolab 8000S has heavily moded with Jensen 10000uf cap etc, do I need to mod the 8000P too with same brands of caps so as to make the sound more match?

3) Any comment on the quality of sound by using Bi-amping to push the speakers compared with using single intergrated amp to push?

4) Anyone have experience in modding 8000P? can share some photos on the PCB, parts list or experience about modding it?


Sugargar

Hi WINDWSS,

I've just got an Audiolab 8000P from my friend and I found that there are 2 x OPA134P inside, want to know which OPA can reaplace the origional one, e.g 627BP or AD797? and suggestion?

Sugargar

Actually, I've done the following modification already:

1) Change all the e-cap under 100uf to Blackgate

2) Change 4 x 10000uf Nichicon Big tank to 4 x Jensen 15000uf

3) Change the default power supply 4A fuse to Furutech Green colour golden end fuse

After changed those parts, already a very great improvment althought those cap still take time run in (e.g. 100+ hrs). Sound is more musical, warm, powerful and clear now.

Problem need to be solved:

1) At the back side of OPA134P (No. C201 on the board), there is a very tiny yellow colour cap connected between 2 pin (No.4 & 7 from data sheet) under the OPA, don't know what it is used for?  If I change IC socket, still need to put this tiny cap under it?  Please see attached photo and data sheet of OPA134.  What kind of improvement can be done if I change the OPA to 627BP?

http://docs-asia.electrocomponents.com/webdocs/0028/0900766b800289f5.pdf

2) What kind of improvement can be done if change the default diode to Schotty diodle?

Existing diodle on the board:
a) A1668 -80(3 legs) x 4
b) A1477 -4B(3 legs) x 2
c) C3787 -7C(3 legs) x 2
4) 1N4002 x 4

Can recommend which diole need to be change and can be replaced by which model in Hong Kong Farnell web. http://hk.farnell.com/

3) Thare are 2 made in China relay on board (black colour) 10A (250V AC/ 24V DC), you recommend to change it?

Thanks a lot

Sugargar

Thanks a lot for great information!!

I have placed the order for diode and 627BP and only need to buy Blackgate 0.47uf cap at Thursday, maybe can finish my 8000P upgrade project at this weekend. Will post test report as soon as possible.

Sugargar

Problem on AVbypass of 8000S + 8000P:

If using bi-amp + bi-wire to push my speaker (treble >> 8000S), (bass >> 8000P), click (PRE) on the 8000S selector working well on 2 channel music.

but if using Onkyo 703 pre-out front channel to 8000S and click (AV-bypass) on the 8000S selector for watching movie, only the treble have sound on my speaker and no signal pass to the 8000P for base sound. Is it possible to change the circuit to make this function? or add 1 RCA splitter to make the signal from AV amp to both 8000S and 8000P at the same time?

Looking for some advice please.


Sugargar