transformer for aleph2

cowanrg · 18th March 2003, 02:55 AM

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?

jam · 18th March 2003, 03:10 AM

1.5 kva is kinda high, you could probably get away with half that for each amp.

Regards,
Jam

cowanrg · 18th March 2003, 03:14 AM

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.

grimberg · 18th March 2003, 05:20 AM

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.

cowanrg · 18th March 2003, 05:31 AM

ah, that is good to know then! i will see if they can get me a transformer for my gainclone as well.

grimberg · 18th March 2003, 05:35 AM

What voltage secondaries are you planning to use for the gainclone?

cowanrg · 18th March 2003, 05:42 AM

im not really sure... im using 24v right now, and it gets HOT! maybe 18v as peter suggested?

grimberg · 18th March 2003, 06:01 AM

Have you tried larger heatsinks? I would try that first before giving up on the power headroom that you get with the 24V secondaries.

cowanrg · 18th March 2003, 06:10 AM

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...)

grimberg · 18th March 2003, 06:36 AM

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!

18th March 2003, 02:55 AM	#1
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	transformer for aleph2 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?

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18th March 2003, 03:10 AM	#2
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	1.5 kva is kinda high, you could probably get away with half that for each amp. Regards, Jam

18th March 2003, 03:14 AM	#3
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	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.

18th March 2003, 05:20 AM	#4
grimberg diyAudio Member Join Date: Oct 2002 Location: California, USA	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.

18th March 2003, 05:31 AM	#5
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	ah, that is good to know then! i will see if they can get me a transformer for my gainclone as well.

18th March 2003, 05:35 AM	#6
grimberg diyAudio Member Join Date: Oct 2002 Location: California, USA	What voltage secondaries are you planning to use for the gainclone?

18th March 2003, 05:42 AM	#7
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	im not really sure... im using 24v right now, and it gets HOT! maybe 18v as peter suggested?

18th March 2003, 06:01 AM	#8
grimberg diyAudio Member Join Date: Oct 2002 Location: California, USA	Have you tried larger heatsinks? I would try that first before giving up on the power headroom that you get with the 24V secondaries.

18th March 2003, 06:10 AM	#9
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	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...)

18th March 2003, 06:36 AM	#10
grimberg diyAudio Member Join Date: Oct 2002 Location: California, USA	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!

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