Home » Sponsored » Pi Speakers » SE tube output transformers to match 1Pi Speakers
SE tube output transformers to match 1Pi Speakers [message #91837] Thu, 07 May 2020 00:04 Go to next message
spiggs is currently offline  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?
Re: SE tube output transformers to match 1Pi Speakers [message #91844 is a reply to message #91837] Thu, 07 May 2020 10:52 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17913
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.
Re: SE tube output transformers to match 1Pi Speakers [message #91845 is a reply to message #91844] Thu, 07 May 2020 11:29 Go to previous messageGo to next message
spiggs is currently offline  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.

Re: SE tube output transformers to match 1Pi Speakers [message #91846 is a reply to message #91845] Thu, 07 May 2020 11:33 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 17913
Registered: January 2001
Illuminati (33rd Degree)

Yes, go with 8Ω.

And you have mail!
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