Schematic for Sony 70ES ?

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
TroelsM

TroelsM

Member
Joined 2003
here's a pic of the little beauty:

Regards TroelsM
 

Attachments

  • 700es.jpg
    700es.jpg
    22.2 KB · Views: 161
es44

es44

Member
Joined 2005
Hi Troels.

You might be lucky at: Sharefx
Requires you to become a member, but it's for free. Then just make a request.
I know for sure, that there's a lot of schematics for older gear, even though at first sight it looks like it's only for newer stuff :)

Best regards ( og ha' en go' dag ;) )

Ebbe
 
TroelsM

TroelsM

Member
Joined 2003
Hi Nigel.

Found it! : Sony TA-F700ES

I might buy an old defect 700es, but without a schematic repair is gonna be a real pain.

BTW: I found a ref that says that each output is 2 pairs of Sanken A1186/C2897.... looking at the datasheet I would say that those trannies are a bit to small for +100W/8Ohm. Opinions?

Regards TroelsM
 
N

Nigel Goodwin

Member
Joined 2005
lpilsley.co.uk
TroelsM said:
Hi Nigel.

Found it! : Sony TA-F700ES

I might buy an old defect 700es, but without a schematic repair is gonna be a real pain.
Click to expand...


The manual isn't on Sony Assist (although the model is listed there), and I don't have a paper manual either.

Do you know what's wrong with it?.

BTW: I found a ref that says that each output is 2 pairs of Sanken A1186/C2897.... looking at the datasheet I would say that those trannies are a bit to small for +100W/8Ohm. Opinions?
Click to expand...

The 2SA1186 is rated at 150V, 10A, and 100WC - looks pretty good to me for a 100W/8ohm domestic amp?. The 2SC2897 isn't listed in Towers, but I presume it's the complement to the 2SA1186?.
 
TroelsM

TroelsM

Member
Joined 2003
Hi Nigel.

Yes its rated at 1oA/150V/100W, but the SOA is not very impressive. I think the amp is somewhere around 125W/8Ohm and that would take a PSU giving +/-50-55V. Thats 100-110V total... If I'm not reading the SOA-chart the wrong way, then the poor little transistor is getting a bit stressed at 110V when it's passing a few amperes...

All this is probably "normal" in consumer/domestic amps, but this was a pretty expensive amp (I think).

I don't know whats wrong with the amp, but with a little luck it's only the PSU thats bad.

Regards TroelsM
 
N

Nigel Goodwin

Member
Joined 2005
lpilsley.co.uk
TroelsM said:
Hi Nigel.

Yes its rated at 1oA/150V/100W, but the SOA is not very impressive. I think the amp is somewhere around 125W/8Ohm and that would take a PSU giving +/-50-55V. Thats 100-110V total... If I'm not reading the SOA-chart the wrong way, then the poor little transistor is getting a bit stressed at 110V when it's passing a few amperes...

All this is probably "normal" in consumer/domestic amps, but this was a pretty expensive amp (I think).
Click to expand...


'Expensive' doesn't mean well built or designed, it means higher profits for Sony!.

I don't know whats wrong with the amp, but with a little luck it's only the PSU thats bad.
Click to expand...

It could be?, Sony sometimes use very under rated transformers, which could never supply the power required if you drive the amp hard - so TX failure is quite common.
 
A

ABO_ZIZO

Member
Joined 2008
HI TroelsM I`M WAGDY FROM EGYPT AND I HAVE NOW THE SAME PROBLEM THAT YOU WAS .. BUT THIS AMPLIFIER HAS TWO NUMBERS FOR THE SAME MODEL
MY MODEL IS SONY TA-F333ESX ( SONY TA-F700ES ) YOU CAN FIND THE SERVICE MANUAL AT: http://.WWW.servicemanuals.COM ) FOR ONLY 17$ ALSO YOU CAN DOWNLOAD IT AFTER ONE DAY OR THEY CAN SEND IT AS PAPER TO UR HOME .. I WISH YOU A GOOD LUCK , I KNOW THAT MY MESSAGE SFTER TWO YEARS , BUT I SAW IT WHEN I WAS SEARCHING THE WEB FOR MY SONY SERVICE MANUAL ..
SORRY
BYEEEEE
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom