Toroid transformer or not - Page 3

Tony · 30th May 2004, 03:16 AM

my traffos, big one is a 3kva one for a leach amp cost at around U$105, smaller one is suitable for a gainclone amp up to 4 chips and costs around U$10.

jleaman · 30th May 2004, 05:28 AM

If i were to build any thing these day's if it to be a cheap project to a hi end thing i would invest in a toroid in any chance i got.. Why.. just because i want the best : O ) and really there not that expensive until you get into the 1kva and up range..

djQUAN · 2nd June 2004, 04:35 AM

tama. walang toroid dito. :P

I couldn't find toroids here locally so I went to hongkong and got a 225VA for a pair of P3A's and a 500VA for a pair of N channel amps.

I guess it'll be a very long time before I could get my hands on new toroids.

as far as cheap EI core trannys go, locally, we can only get those under rated ones that get hot even at idle (I assume those are run well near core saturation to get better regulation to make up for voltage drop due to underrated-ness). I had one that was rated at 1.2kVA and is only about the size of a 300VA EI. for lower voltages, the real ratings are closer to that specified.

Tony · 2nd June 2004, 10:13 AM

Quote:

as far as cheap EI core trannys go, locally, we can only get those under rated ones that get hot even at idle (I assume those are run well near core saturation to get better regulation to make up for voltage drop due to underrated-ness). I had one that was rated at 1.2kVA and is only about the size of a 300VA EI. for lower voltages, the real ratings are closer to that specified.

the heat is due to the fact that locally available iron require more turns than goss types...besides local winders tend to everrate their traffos...your observation is on the dot...

i take this into consideration whenever i design a traffo for my own use.....

dhenryp · 2nd June 2004, 03:31 PM

Try Apex Jr. I bought a half dozen 350VA El XFormers a few years back for ~ 8$ a piece. They are very good quality and I am, in fact, I'm in the process of using most of them for a & Channel Chip Amp HT setup. These are gone but Apex does have a 55V CT 7+ amp El for 7.95

Fender 55 Dual 55V power transformer @ 7.12 Amp

http://www.apexjr.com/miscellaneous.html

I think El's and Torroids both have some plusses and minuses. I'm not convinced that a properly sized transformer of either type is going to affect your sound, all other things being equal (i.e. same bridge, caps amps). If there is a difference, it is debatable, (and has been debated here before) which type is better.

jinkuchi · 3rd June 2004, 09:06 AM

it harder to find.
normally they use rectangular transformer.
I have big one, it work very perfect (with ELNA 20000 MFD 50V CAPACITORS).

but..
I need teroid because it gonna looked beautiful.
it thin too!
and it not hot!

3 things is enough

tiger

3rd June 2004, 09:06 AM	#26
jinkuchi diyAudio Member Join Date: May 2004 Location: shinjuku	it harder to find. normally they use rectangular transformer. I have big one, it work very perfect (with ELNA 20000 MFD 50V CAPACITORS). but.. I need teroid because it gonna looked beautiful. it thin too! and it not hot! 3 things is enough tiger __________________ jinkuchi

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30th May 2004, 05:28 AM	#22
jleaman Banned Join Date: Apr 2002	If i were to build any thing these day's if it to be a cheap project to a hi end thing i would invest in a toroid in any chance i got.. Why.. just because i want the best : O ) and really there not that expensive until you get into the 1kva and up range..

2nd June 2004, 04:35 AM	#23
djQUAN diyAudio Member Join Date: May 2004 Location: manila	tama. walang toroid dito. :P I couldn't find toroids here locally so I went to hongkong and got a 225VA for a pair of P3A's and a 500VA for a pair of N channel amps. I guess it'll be a very long time before I could get my hands on new toroids. as far as cheap EI core trannys go, locally, we can only get those under rated ones that get hot even at idle (I assume those are run well near core saturation to get better regulation to make up for voltage drop due to underrated-ness). I had one that was rated at 1.2kVA and is only about the size of a 300VA EI. for lower voltages, the real ratings are closer to that specified.

2nd June 2004, 03:31 PM	#25
dhenryp diyAudio Member Join Date: Aug 2003 Location: Mass.	Try Apex Jr. I bought a half dozen 350VA El XFormers a few years back for ~ 8$ a piece. They are very good quality and I am, in fact, I'm in the process of using most of them for a & Channel Chip Amp HT setup. These are gone but Apex does have a 55V CT 7+ amp El for 7.95 Fender 55 Dual 55V power transformer @ 7.12 Amp http://www.apexjr.com/miscellaneous.html I think El's and Torroids both have some plusses and minuses. I'm not convinced that a properly sized transformer of either type is going to affect your sound, all other things being equal (i.e. same bridge, caps amps). If there is a difference, it is debatable, (and has been debated here before) which type is better.

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