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Old 9th April 2012, 10:55 AM   #11
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by elic View Post
Each one has a single secondary.
in that case you can connect primaries in series ;

will explain later , have some things to do
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Old 9th April 2012, 11:16 AM   #12
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ANY imbalance will become expensive when they become apparent. A few Euros saved at this point may cost hundreds of Euros in the future.

Have a look on E-Bay and at http://www.rs-online.com There are loads of 625VA transformers for about 60.

http://www.amazon.co.uk/MULTICOMP-Tr...3966730&sr=8-3

Last edited by KatieandDad; 9th April 2012 at 11:19 AM.
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Old 9th April 2012, 11:18 AM   #13
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This is a good argument, I agree. I thought a fuse will save me in this case. but I guess I should get a suitable transformer.
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Old 9th April 2012, 11:22 AM   #14
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In a Class A/B amplifier only one half is drawing the maximum current at one time - IMBALANCE.

Last edited by KatieandDad; 9th April 2012 at 11:28 AM.
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Old 9th April 2012, 11:30 AM   #15
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Agree, this is a bad idea. If the secondary coils where in paralel, I could see it as an option, but as separate loads, charging the smooting capacitors alternatelly (like it was already said due to class A/B)... It will end up in smoke.
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Old 9th April 2012, 07:21 PM   #16
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Thank you all. I give up :-)
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Old 8th May 2012, 03:10 PM   #17
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Hello Guys,

Incidentally I had the same question, but for a Class A amp (FirstWatt F2J):
I found 2 very nice Avel Lindberg 337W sealed toroids second hand (and cheap!)
Primary: 2 x 115V
Secondary: 2 x 37V

Mains is 230V where I live and I was thinking of putting each primaries (totally 4 windings) in series to get 4 secondaries at 18.5 VAC (that I would parallel 2+2 to get 2 channels).

Is this any better idea in Class A than class AB ?
And also, do I somehow lose the reduced crosstalk benefit of having 2 seperate toroids by doing so ?

Thanks a lot !
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Old 8th May 2012, 03:32 PM   #18
elic is offline elic  Israel
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Hi,
as long as you connect the secondaries of different transformers in series you should be OK. In fact, I am going to do the same but with four different 110V transformers. I will connect each two's primaries in series and connect secondaries in series (that's because I have only one secondary in each transformer).
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Old 8th May 2012, 04:00 PM   #19
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Quote:
Originally Posted by elic View Post
Hi,
as long as you connect the secondaries of different transformers in series you should be OK. In fact, I am going to do the same but with four different 110V transformers. I will connect each two's primaries in series and connect secondaries in series (that's because I have only one secondary in each transformer).

WOOOAAA.

Be VERY VERY careful.

If you keep everything IN PHASE then you should be OK.

Funny things do happen with transformers in series though. You would be better to sell on the different transformers and buy the correct one in the first instance.
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Old 8th May 2012, 04:01 PM   #20
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Quote:
Originally Posted by Lazybutt View Post
Hello Guys,

Incidentally I had the same question, but for a Class A amp (FirstWatt F2J):
I found 2 very nice Avel Lindberg 337W sealed toroids second hand (and cheap!)
Primary: 2 x 115V
Secondary: 2 x 37V

Mains is 230V where I live and I was thinking of putting each primaries (totally 4 windings) in series to get 4 secondaries at 18.5 VAC (that I would parallel 2+2 to get 2 channels).

Is this any better idea in Class A than class AB ?
And also, do I somehow lose the reduced crosstalk benefit of having 2 seperate toroids by doing so ?

Thanks a lot !

Theoretically it seems OK. However, my experience of connecting transformers in series has always been poor results.
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