Acurus A250 and starground
KNielsen
Well-Known Member
I've never seen an Aragon closeup yet (only listened to a couple of them).. Maby @mondialfan can help?
My guess is that it's by selector at the back, or internal jumpers?? But I really don't know
Best regards
KNielsen
Well-Known Member
On second thought: are you sure your DMM is measuring correctly? Even by adjusting the voltage selector, as low as 50VDC shouldn't be able to achieve??
Best regards
mondialfan
Well-Known Member
The current thread is about the Acurus amps. It would be best to start a new thread on this subject here in the DIY section. Then other owners of Aragon amps will be able to find it in the future. I'll try to answer any questions if you start a thread.
mondialfan
Well-Known Member
I wouldn't use them. On Semi has their own replacement for the Toshiba parts. On Semi MJL1302/MJL3281
KNielsen
Well-Known Member
Thanks for reply. I see the TTA/TTC is rated at 150w pr unit, over 200w with the MJL....
I'd been recommended trying the TT-series, but it didn't feel right.
Best regards
KNielsen
Well-Known Member
mondialfan
Well-Known Member
It is powered from the +75VDC rail.
KNielsen
Well-Known Member
Ok thanks
.. I've tried to find some info regarding the build of this stage (components ect), but not mush came up.
KNielsen
Well-Known Member
@mondialfan is the speaker protection a simple relay that can be bought, or a bigger circuit?
From the pics it looks quite simple
From the pics it looks quite simple
mondialfan
Well-Known Member
The protection circuit is on the channel boards. Some of the schematics used to be available on Indy Audio's site under the Aragon legacy products here.
KNielsen
Well-Known Member
Am still working on the above for my living room, and almost finished the main boards. Still need to a design softstart and speakerprotection circuit.
I used KSA992/KSC1845 as diff-pair, thermally coupled, but came across the THAT 340 once again on the internet.... I've been looking at this ever since mentioned here in the past.. And this could be fun to try.
What is the lose if selecting a lower Hfe device like THAT 340 over the TO-92 devices mentioned?
-Regarding the PCB-image shown, I need to turn the two transistors right beneath the "Amodded" signature 90degrees... After adding a footprint for a suitable (overkilled?!) heatsink, Wakefield-Vette 637-15ABPE (also pictured) or the smaler 637-10ABPE , the front copperlayer became to uneven for my liking to make the needed connections. And that's about it, if I'll stick to the TO-92's as differentiel
Best regards
I used KSA992/KSC1845 as diff-pair, thermally coupled, but came across the THAT 340 once again on the internet.... I've been looking at this ever since mentioned here in the past.. And this could be fun to try.
What is the lose if selecting a lower Hfe device like THAT 340 over the TO-92 devices mentioned?
-Regarding the PCB-image shown, I need to turn the two transistors right beneath the "Amodded" signature 90degrees... After adding a footprint for a suitable (overkilled?!) heatsink, Wakefield-Vette 637-15ABPE (also pictured) or the smaler 637-10ABPE , the front copperlayer became to uneven for my liking to make the needed connections. And that's about it, if I'll stick to the TO-92's as differentiel
Best regards
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