S.A.E preamp + amp

[sakis]

just come in to the shop for repair SAe pre and main amplifier

amplifier is relativelly easy beyond repair needs an 110-230 volt conversion but preamlifier uses a hell of a lot of bipolars ( there is no need to say that since 1981 day of production there is not even one of the electrolytics working properly )

for the preamplifier there is a few caps in the signal path that are bipolars like 47mfd/6.3v what will be a suitable replacement ???

then again on the prepalifier that there is some feedback circuits also 220mfd/6.3volts bipolar is used what will be a switable replacement for that also ???

strange is that in the pcb there is marks +- for normal lectrolytics but after all bipolars are used ...

any ideas ??? the preamp is the P101

thanks

[QSerraTico_Tico]

Originally Posted by sakis

just come in to the shop for repair SAe pre and main amplifier

amplifier is relativelly easy beyond repair needs an 110-230 volt conversion but preamlifier uses a hell of a lot of bipolars ( there is no need to say that since 1981 day of production there is not even one of the electrolytics working properly )

for the preamplifier there is a few caps in the signal path that are bipolars like 47mfd/6.3v what will be a suitable replacement ???

then again on the prepalifier that there is some feedback circuits also 220mfd/6.3volts bipolar is used what will be a switable replacement for that also ???

strange is that in the pcb there is marks +- for normal lectrolytics but after all bipolars are used ...

any ideas ??? the preamp is the P101

thanks

Nichicon bipolars from Partsconnexion?
http://www.partsconnexion.com/capaci...chicon_es.html

[sakis]

here is a part of the schematic of the specific amp ....
eventhough in the schematic the mark is for electrolytic caps with polarity also in the board ther is polarity marks for the capacitors still in most of these positions are bipolar capcitors placed ....

anyone things that if i put normal electrolytics there will make any serious diference ????

[sakis]

just finishd reparing this amp

all electrolytics where replaced
new trafo 600w 230 volts rated fitted inside
mechano
multi turns
warm up, idle and now playing

i am not thrilled .... my P3A is unbeatable eventhough less power

in a few words tha SAE provides more power bass is tight clean enough but not plenty midle lacks on depth high is rather confusing not that clean and also not tha detailed

My P3A to compaire with is standard vesrion in my pcb features matched LTP with thermal junction silver mica input cap 350pf / MKS input capacitor / BD139-140 drivers and VAS with 82PF silver mica miller and 100pf styroflex miller cap on the driver ...standar original 2SA1302-3281 outputs biassed at 120ma ....dual mono with 250w trafo per channel and 22.000 mfd per amplifier

thats it ....simply unbeatable

[sakis]

some small update

after a few days of listening it prooved that 82 capacitors inside to replace didnt do the trick ....all 33 relay needed to be replaced also ....

year of make 1982 ....figers /

regards sakis