bikingbuddha
Well-Known Member
Does anyone have schematics or diagrams for this old japanese tube amplifier? Plz let me know.
Thanks a lot.
Thanks a lot.
Eagle sa-200 tube amplifier service manual
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Dandy
Addicted Member
I have not been able to find any out there. It is similar to the SA-100, but no schematics around for it either.
Maybe you can say why you need the schematics and we can see how to help. You should be okay in servicing it, unless it has been messed with in the past. It's a SE amp running one 6BQ5 per channel, so there should be generic schematics out there to compare with yours. E.g. Compare yours with Dave G's legendary thread on the Magnavox 8600 series, which does have schematics. https://www.audiokarma.org/forums/i...ore-out-of-the-8600-series-a-lot-more.665735/
Maybe you can say why you need the schematics and we can see how to help. You should be okay in servicing it, unless it has been messed with in the past. It's a SE amp running one 6BQ5 per channel, so there should be generic schematics out there to compare with yours. E.g. Compare yours with Dave G's legendary thread on the Magnavox 8600 series, which does have schematics. https://www.audiokarma.org/forums/i...ore-out-of-the-8600-series-a-lot-more.665735/
bikingbuddha
Well-Known Member
Thanks for the reply. We salvaged an old SA-200 which hasn't been used for very long time and it didn't have any sound, The tubes glow but no sound, so we took it straight to our amplifier repair guy and he is working on it. He asked me if i could find him the schematics so it would be much easier for him to get it back in shape. Nothing is messed inside, so far he is changing all the caps inside since they are not good, I will update as it progresses.
bikingbuddha
Well-Known Member
Here is an update. The repair person asked me to get him certain electrolytic capacitor with following values.
0.5uf x 6 400v
0.005uf x 6 203v
0.001uf x 6
I search for them in all of electronic shops which i know and i couldn't find them.
I guess only way to get them is internet. I never these electronic components could be so rare.
0.5uf x 6 400v
0.005uf x 6 203v
0.001uf x 6
I search for them in all of electronic shops which i know and i couldn't find them.
I guess only way to get them is internet. I never these electronic components could be so rare.
0.47uf @ 400V https://www.mouser.com/ProductDetai...s/BFC236855474/?qs=Ypa0Bugdmhrc%2BBzyjCuBwA==
0.0047uf @ 400V https://www.mouser.com/ProductDetail/Vishay-BC-Components/BFC236855472/?qs=Ypa0Bugdmhqbw6UT5ug0YQ==
0.001uf 400v https://www.mouser.com/ProductDetail/Vishay-BC-Components/BFC246755102/?qs=zhfFQ7SvPi4b0f8eMfyy6g==
Use the above values. The values you listed are OLD, and they've been updated in the early 70's. Ain't NONE of them E-Lytics. Most likely axial wax encased paper film caps. Film caps are fine.
0.0047uf @ 400V https://www.mouser.com/ProductDetail/Vishay-BC-Components/BFC236855472/?qs=Ypa0Bugdmhqbw6UT5ug0YQ==
0.001uf 400v https://www.mouser.com/ProductDetail/Vishay-BC-Components/BFC246755102/?qs=zhfFQ7SvPi4b0f8eMfyy6g==
Use the above values. The values you listed are OLD, and they've been updated in the early 70's. Ain't NONE of them E-Lytics. Most likely axial wax encased paper film caps. Film caps are fine.
FlaCharlie
Super Member
As Larry says, there have never been electrolytic caps produced in those values. If you have local shops that sell capacitors, they should have film caps in the modern equivalent values (.47uf 400v, .0047uf 250v and .001uf ??v).
Are you sure your repair person knows what they're doing?
I would think that someone with experience working on electronics would know the difference between an electrolytic cap and a old wax covered paper cap and that they would also know the values that modern caps are made with.
And why would they specify a cap rated at 203v? I may have seen 200v caps (?) and 250v caps are common, but I doubt any manufacturer ever made caps rated at 203v. Anyone who works on electronics should know this.
Dandy
Addicted Member
What Larry said. The main thing is that these film capacitors are not rare. They are also pretty small and cheap, and could be mailed to you in a small package.
Look for what you need from the mylar capacitors listed here: https://nilambaraelectronics.com/product-category/components/capacitors/
bikingbuddha
Well-Known Member
Thank you all for the help. I already told him everything and i think he has gone crazy. Today I'm going back there. Get it done
bikingbuddha
Well-Known Member
We still haven't been able to get this repaired. So far we fixed the power section and the transformer issues. Now the repairman says he need to know how this 12ax7 works there. He wants me to find a schematic that has similar tubes.
FlaCharlie
Super Member
I hate to say it but it sounds like your "tech" doesn't know what he's doing. It should not take 7 months to fix this. You said it had not been "messed with". Is there some reason why you couldn't just replace every existing part with a new one? Or was it missing lots of parts?
Go back and read the earlier responses. In the very first response to your request someone said they thought this was a basic SE amp that uses a 6BQ5 / EL84 outputs but you never confirmed this or gave any info about the other tubes it uses. There are many examples of SE 6BQ5 amps that use a 12AX7 input tube so finding a similar schematic should be easy.
He also posted a link to a thread about a SE Magnavox that uses a pair of 6BQ5 outputs, one 6EU7 preamp tube and a 6CA4 / EZ81 rectifier tube. The 6EU7 is similar to the 12AX7 except that it has a different pinout. Did you ever look at the link?
But, since your "tech" seems to be confused enough as it is, here's a different Magnavox. The rectifier may be different than yours but it does use a 12AX7. It's in pdf which can be enlarged to show detail.
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bikingbuddha
Well-Known Member
Alright, I already told him what I understand. I gave him the documentation you gave me.
FlaCharlie
Super Member
Hopefully, he'll be able to figure it out. Amps like this use very few parts so it shouldn't be difficult.
I found some pics online.
https://www.whybuynew.co.uk/consume...-sa-200-stereo-integrated-valve-amplifier.htm
Is this the same as your amp? I'm guessing it's Japanese but I don't think I've seen one before. Many Japanese amps were sold under a variety of brand names. The amp in the pic is obviously not original, but perhaps someone will recognize it and there might be a schematic available listed under a different brand.
It might be helpful if you could tell us what tubes it uses. Based on the pics I'm guessing a 6CA4 rectifier, two 6BQ5s and three 12AX7s. Two of the 12AX7s would be used for a phono stage. (???) If you're not using a turntable, only a line level source, you would not necessarily need to rebuild the phono section but the tubes should be left in place anyway.
FlaCharlie
Super Member
Here's another link you might find interesting. No schematic, though.
https://audioaddictsforum.com/thread/1840/cautionary-tale-eagle-valve-amplifiers
https://audioaddictsforum.com/thread/1840/cautionary-tale-eagle-valve-amplifiers
Dandy
Addicted Member
This thread might help. It refers to a UK tech who worked on one a while back. https://www.vintage-radio.net/forum/showthread.php?t=72154
It's a crystal input or external phono stage
The design is a little odd but it does sound good
I use an external mm phono stage for vinyl & an Alexa for streaming, both require an in-line attenuator to drop the level to the old standard
Valves are
ECC83 / 12AX7 input
6AQ8 driver
EL84 output
6CA4 rectifier
Direct inputs are tape, mic, aux & mag
Tuner input has 1M inline & 250k to ground
Xtal has 1M & 40pF inline, 250k to ground
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