Old Fidelity - HiFi Klassiker Forum

I couldn't think of a better title than this

a little more serious now...last few days there has been some free time to work on these preamp.Although it has been repaired before, not as destroyed as the Peru version.
Anyway, here are a few pictures...someone might be interesting

regulators





"deathly" glue is removed and the new capacitors (Elna silmic and Nichicon muse) are installed,all the solders were re-soldered

headphone amp...same thing

before


and after

phono stage









and both channels are ready

eq stage...how boring

before


and several minutes later

Great Job!

Thank you for this pretty nice picturestory.



Dirk

I hope the story continues.

(15.07.2011, 17:25)charlymu schrieb: [ -> ]Great Job!

Thank you for this pretty nice picturestory.



Dirk

I hope the story continues.

thanks,
the story will certainly continue Dirk, unless something starts to burn or smoke at my table

Thank you Robert!



Dirk

Don´t forget to have an fire extinguisher close to you..

Great work! Keep on going the story!

What do you use to remove this old glue? I have this also very often and I removed it mechanically only. Not the best way and not so clean as yours.

Thank you!

Hallo Jan,

ich benutze in schwierigen Fällen immer Aufkleberentferner - Labelremover. Das funktioniert ganz gut, muß aber, je nach Kleber, länger einwirken.



Dirk

Looks good so far, Robert. Keep going!

nonPeru Edition

Fine Robert . Seems you´re doing a good job .

Hvala

(15.07.2011, 17:55)charlymu schrieb: [ -> ]Don´t forget to have an fire extinguisher close to you..

Would glass of watter do the job??

(15.07.2011, 18:26)errorlogin schrieb: [ -> ]What do you use to remove this old glue? I have this also very often and I removed it mechanically only. Not the best way and not so clean as yours.

Jan,an old Sansui-san once told me Nitroverdünnung is the right stuff.
Apply it several times with a cotton swab,until the glue becomes soft,and then followed by mechanical scraping.Takes about 20 minutes to remove all the glue from suche a small pcb.Take time, do not hurry up.

(15.07.2011, 19:31)Yamanote schrieb: [ -> ]Looks good so far, Robert. Keep going!

tnx...will do

(15.07.2011, 19:57)Passenger schrieb: [ -> ]nonPeru Edition

well....you know me....I'm weird guy

(15.07.2011, 20:24)Maxihighend schrieb: [ -> ]Fine Robert . Seems you´re doing a good job .
Hvala

very kind of you...hvala tebi....it's not so hard...one cap out...another cap in

volume board...
same boring thing...in...out...in...out

all sorts of strange things can be found inside of switches

Hi Robert, what is the reason for changing the capacitors?

(16.07.2011, 07:18)armin777 schrieb: [ -> ]Hi Robert, what is the reason for changing the capacitors?

Hello Armin
Reason?
Somehow, I get the feeling that you don’t agree with me about changing capacitors...ok,I’ll try to explain ( but my general opinion is that all capacitors should be changed... especially if the device will be in daily use)
1.-this preamp is over 35 years old
2.-it will be in 24/7 use in the future
3.-already been repaired and some capacitors changed with cheap one

A little backstory...
I heard that the CA/BA-3000 combo will be for sale in a neighboring country for a couple of days (before owner published an Ad). I contacted him ...he also sent me a pictures... I wasn’t satisfied because CA/BA wasn’t in MINT condition...and I gave up.
A few days later, friend calls me and asks for my opinion.I told him everything,but...he can’t resist and bought all.
And how it usually happens, on his own system, he found all the deficiencies...and here we are.
About friend of mine...he is a real audiophile...have some expensive stuff (Avalon,EMT,C&J....) and a few month ago he descovered Sansui.
He was so thrilled with AU-9900 and decided to buy some more serious Sansui...
Just wait to see how the BA was butchered

Hi Robert,

Your feeling is the right one!

I never change a capacitor in any device, only when it is defective. Than mostly I change this capacitor in both channels.

haaaaa,
Robert is alive

(16.07.2011, 10:50)armin777 schrieb: [ -> ]Hi Robert,

Your feeling is the right one!

I never change a capacitor in any device, only when it is defective. Than mostly I change this capacitor in both channels.

ok,we can agree we disagree about that
Would you explain to me why not changing all caps,please.I know you have lots of experience and I'm interested in your opinion.

(16.07.2011, 11:45)New-Wave schrieb: [ -> ]haaaaa,
Robert is alive

I'm aliiiive...I'm aliiiive

Bruno,a fing lot of work in the past month ,but tomorrow everything will be great....I'm packing my stuff....and....vaaacaaatioooon!!!
Can you believe that a month ago I bought the SP100i and NOS alpha 607mrx and they are still in boxes in my basement?

Why should I renew a well working capacitor? All the people talk about the lifetime of the capacitors and take it to the reason for changing them. The lifetime of a capacitor is specified at that temperature what is written on it (mostly 85 or 105°C). At normal room temparature it is 600 times higher at average. As example: normally they have a lifetime of 5000 hrs, 5000 x 600 = 300.000 hrs, this means nearly 40 years duty without any switched off times.

Cool work Robert, thanks for the pics.



I prefer to let my CA-3000 untouched.
If there is a problem, I'll send it to you

(16.07.2011, 14:50)armin777 schrieb: [ -> ]Why should I renew a well working capacitor?

because these old capacitors are ugly,and a new one are so shiny,gold,black,green,...

(16.07.2011, 14:50)armin777 schrieb: [ -> ]All the people talk about the lifetime of the capacitors and take it to the reason for changing them. The lifetime of a capacitor is specified at that temperature what is written on it (mostly 85 or 105°C). At normal room temparature it is 600 times higher at average. As example: normally they have a lifetime of 5000 hrs, 5000 x 600 = 300.000 hrs, this means nearly 40 years duty without any switched off times.

respect Armin,respect
Although all the capacitors are working, I think it's just a matter of time when they will start to strike...and then...who knows?
Since I'm Sansui maniac (tnx Jan,great compliment ),I want every one Sansui in my possession to be in top condition.They can't be in suche condition with old caps.

(16.07.2011, 14:54)oldsansui schrieb: [ -> ]If there is a problem, I'll send it to you

thanks Rainer...in fact,I have a big problem and you can help...this preamp is not mine
I would be so happy to have a nice one.Would you? Please
I'll send you stuff you like (one or three digit receivers)

Digital receivers ?

Oh, Rainer, i´ll think you misunderstood ...