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SE tube output transformers to match 1Pi Speakers [message #91837]

Thu, 07 May 2020 00:04

spiggs
Messages: 2
Registered: May 2020

Esquire

I am building a Tubelab SSE and looking to the next project which will be a set of speakers. The 1Pi seems to fit the bill however after looking at the impedance graph I am unsure what to choose for output transformers. My initial plan was to go with a pair of Edcor GXSE15-8-5k. However the 1Pi spends a good portion of it's range under 8 ohm dipping down to what looks like 4 ohm at 2 points. Will the 8 ohm transformers drive them ok or should I be looking at a lower output impedance?

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Re: SE tube output transformers to match 1Pi Speakers [message #91844 is a reply to message #91837]

Thu, 07 May 2020 10:52

Wayne Parham
Messages: 18783
Registered: January 2001

Illuminati (33rd Degree)

You can use either the 4Ω or 8Ω tap, whichever sounds best to you. You can use either tap without risk of harm to amp or speakers. I generally prefer to use the 8Ω tap on my tube amps.

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Re: SE tube output transformers to match 1Pi Speakers [message #91845 is a reply to message #91844]

Thu, 07 May 2020 11:29

spiggs
Messages: 2
Registered: May 2020

Esquire

Thanks for the reply Wayne. That model of Edcor only comes with a single tap so I need to choose either 4Ω or 8Ω when I purchase them. My original plan was to get the 8Ω version so I will stick with that.

Can I also get a copy of the plans for the 1Pi? Thanks again.

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