Here is the find: A 1/2 working SAE A-205 amp at a garage sale for $10. The bad news: The non-working channel is smoked, and will not be a fun repair. I am a GC virgin and want to know how much I would have to put into this to turn it into a nice GC (100wpc) amp.
Here is the pic of what I got
Here is the pic of what I got
An externally hosted image should be here but it was not working when we last tested it.
Try doing a search for bridge clone, as you have more than enough heatsinking there to get you going and plenty of room to fit in the transformer and other bits and pieces.
This thread may be a good place to start:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=11133
And national have an aplication note abou this topic which is probably worth you reading too.
http://www.national.com/appinfo/audio/files/BPA-200_Application_Note.pdf
And
http://www.national.com/an/AN/AN-1192.pdf
This thread may be a good place to start:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=11133
And national have an aplication note abou this topic which is probably worth you reading too.
http://www.national.com/appinfo/audio/files/BPA-200_Application_Note.pdf
And
http://www.national.com/an/AN/AN-1192.pdf
I'm not sure if I would recommend a bridged Gainclone as a first project. Why do you want/need 100 wpc?
Try a plain vanilla Gainclone first and to get some idea of how to achieve that, take a look at a similar project of mine.
Try a plain vanilla Gainclone first and to get some idea of how to achieve that, take a look at a similar project of mine.
Other than bigparsnip, you folks have been much less than helpful. I say go for it. I'm currently thinking about changing an old Class AB to a Class A. Why not?
Nuuk's suggestion is a good one, if you haven't built much before. Maybe try a bare-bones, open-frame gainclone first, you could even power it from the SAE amp power supply. Then build the real one and go nuts.
Nuuk's suggestion is a good one, if you haven't built much before. Maybe try a bare-bones, open-frame gainclone first, you could even power it from the SAE amp power supply. Then build the real one and go nuts.
The trafo looks good, but I would at least replace the capacitors, even if its just regular Nichicon caps. Since the those look a little old.
Man I thought Magnepans were some of the worst, and I've pushed mine with a 35 watt Monarchy Audio Class A amp. I've never clipped that thing. Thats why I'm under the impression that you just dont need a ton of power.
mikejz84 said:
Man I thought Magnepans were some of the worst, and I've pushed mine with a 35 watt Monarchy Audio Class A amp. I've never clipped that thing. Thats why I'm under the impression that you just dont need a ton of power.
Attachments
omigod...
nuuk, i think you mean 38 VDC (after rectification) or somewhere ~25V AC directly on the secondaries...
don't you ?
When running my clones on a 25V secondaries toroid they got pretty hot... Right now i'm using a toroid with 15V secondaries (i don;t really need all that much power anyways, i'm kinda fond of my hearing...)
nuuk, i think you mean 38 VDC (after rectification) or somewhere ~25V AC directly on the secondaries...
don't you ?
When running my clones on a 25V secondaries toroid they got pretty hot... Right now i'm using a toroid with 15V secondaries (i don;t really need all that much power anyways, i'm kinda fond of my hearing...)
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.