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Old 30th April 2008, 02:02 PM   #1
wicked1 is offline wicked1  United States
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Default Quick output transformer wiring question

Hello,
I've got so much money tied up on my transformers and tubes, I don't want to mess anything up. . Otherwise, I'd just experiment w/out asking questions.

So, just to be sure.
If my output transformer primary is 3k, and I want it to act like it's 6k, I would connect my 8 ohm speakers to the 4 ohm tap?

I just want to make sure I don;t have it backwards.

thanks!
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Old 30th April 2008, 02:19 PM   #2
chrish is online now chrish  Australia
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I am no expert, but I think that this is termed reflected load. If you had an 4 Ohm speaker on the 4 Ohm tap, the reflected load to the output valve would be 3K. Therefore if you double the load on the secondary to 8 Ohm, the load reflected to the output valve would also be doubled - to 6K.

So yes, I think you are correct.

Chris
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Old 30th April 2008, 02:26 PM   #3
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Yes, but...

...count on losing an octave from the bass response. For SE transformers especially, there is no free lunch - it won't perform as well as one designed for the 6K load.
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Old 30th April 2008, 03:04 PM   #4
chrish is online now chrish  Australia
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Which begs the question, if you have so much money tied up in the output transformers, why did you not get the right ones to start with?
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Old 30th April 2008, 03:56 PM   #5
wicked1 is offline wicked1  United States
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HAH why indeed.....

really, I'm trying different tubes in my amp...
Plus, I dont' fully understand the output transformers yet. I hope to learn something by trying different settings. There's such a wide variation between what people use. Some people say 5k sounds better than 3k for 300b, etc.
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