Quick output transformer wiring question

wicked1 · 30th April 2008, 02:02 PM

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!

chrish · 30th April 2008, 02:19 PM

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

Tom Bavis · 30th April 2008, 02:26 PM

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.

chrish · 30th April 2008, 03:04 PM

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?

wicked1 · 30th April 2008, 03:56 PM

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.

30th April 2008, 02:02 PM	#1
wicked1 diyAudio Member Join Date: Jan 2008	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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30th April 2008, 02:19 PM	#2
chrish diyAudio Member Join Date: Oct 2003 Location: Sydney	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

30th April 2008, 02:26 PM	#3
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	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.

30th April 2008, 03:04 PM	#4
chrish diyAudio Member Join Date: Oct 2003 Location: Sydney	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?

30th April 2008, 03:56 PM	#5
wicked1 diyAudio Member Join Date: Jan 2008	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.