hey all!
im currently trying to source a transformer for my aleph2 monoblocks. as some of you know, i want to overkill the whole thing, but im having a problem finding the transformer i want. i want a 1.5kva, with 33v secondaries (right?).
well, plitron only has a 1.5kva with 38v secondaries an up. would this work?
i got a quote from victoria magnetics, but they are $168 each. thats a LOT! plitron is only $113.
any ideas?
im currently trying to source a transformer for my aleph2 monoblocks. as some of you know, i want to overkill the whole thing, but im having a problem finding the transformer i want. i want a 1.5kva, with 33v secondaries (right?).
well, plitron only has a 1.5kva with 38v secondaries an up. would this work?
i got a quote from victoria magnetics, but they are $168 each. thats a LOT! plitron is only $113.
any ideas?
nah, dont want to "get away with" anything. i want to do 1.5kva, im earlier posts when i was planning the project out, many people (included peter daniel and nelson pass), suggested the 1.5kva would be the best i could do, and this is kinda what im going for.
From my experience purchasing from Plitron, they will make the transformer with whatever voltage you specify for the secondaries. I have ordered non-standard voltages and there was never an objection or additional cost.
ah, that is good to know then! i will see if they can get me a transformer for my gainclone as well. 🙂
Have you tried larger heatsinks? I would try that first before giving up on the power headroom that you get with the 24V secondaries.
no, i havent. im using a very small heatsink as of now, and its not even properly bolted.
however, i was advised that 24v was too much for the chip. also, i heard better bass response was to be had at 18v.
maybe i should try better heatsinking and see? (oh, i have 4ohm speakers too...)
however, i was advised that 24v was too much for the chip. also, i heard better bass response was to be had at 18v.
maybe i should try better heatsinking and see? (oh, i have 4ohm speakers too...)
The supply voltage limits specified in the LM3875 datasheet take into consideration an 8 ohm load. If you are planning on driving 4 ohm speakers it makes sense to use secondaries with voltages below the maximum allowed and avoid the current limiting circuit to kick in. However, I haven't tried it. Considering that you already have it assembled and working, try better heat sinking first and check how it behaves and sounds.
Happy experimenting!
Happy experimenting!
yeah, i will...
i had the IC's clamped to my heatsink, and it melted the clamps 🙂 it got HOT. but i also had it driving some kappas and boston acoustics VRM90's in a LARGE sound-dampened listening room at HIGH volumes, in the cardboard box of course 🙂
ill try much better heatsinking, and see. i did like the sound. but maybe 20v or 22v could be a good compromise, it was a little lacking in bass.
i had the IC's clamped to my heatsink, and it melted the clamps 🙂 it got HOT. but i also had it driving some kappas and boston acoustics VRM90's in a LARGE sound-dampened listening room at HIGH volumes, in the cardboard box of course 🙂
ill try much better heatsinking, and see. i did like the sound. but maybe 20v or 22v could be a good compromise, it was a little lacking in bass.
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