Bottlehead Forum

General Category => Technical topics => Topic started by: johnsonad on December 06, 2020, 06:36:02 AM

Title: Transformer secondary windings and sonic differences
Post by: johnsonad on December 06, 2020, 06:36:02 AM: Team BH,

A theory-ish question that isn't the easiest to find using Dr. Google.

This is specific to the Kaiju output transformer. If I had a load of say 22k, which configuration would you choose? On a more fundamental level, is there a sonic difference between the different secondary windings? Is there a difference in power output? And lastly, specific to the Kaiju OPT as you all designed it, is there a sweet spot?

Thanks,

Aaron
Title: Re: Transformer secondary windings and sonic differences
Post by: Paul Joppa on December 06, 2020, 07:42:42 AM: There is essentially no difference in performance of the Kaiju output transformer among the output impedance options outside of the turns ratio effects. Specifically, primary inductance, leakage inductance, series resistance, and winding capacitance, as seen by the output tube plate, are the same. They produce the same power when loaded by the nominal impedance and 22K is close enough to infinite (relative to 2, 4, 8, or 16 ohms) that it has no effect.
Title: Re: Transformer secondary windings and sonic differences
Post by: Paul Birkeland on December 06, 2020, 07:44:55 AM: Quote from: johnsonad on December 06, 2020, 06:36:02 AM
If I had a load of say 22k, which configuration would you choose?
I'd want to know a lot more about the load!
Title: Re: Transformer secondary windings and sonic differences
Post by: johnsonad on December 06, 2020, 08:02:04 AM: Thanks PJ and thank you for designing a really nice OPT!

PB, I texted you about it yesterday. I'm looking at a pair of Hedd Type 05 Mk2 monitors. They have an input impedance of 22k, probable to take 220 Ohm console direct in. As a amplifier is technically balanced at the outputs (?), I was thinking about building a cable with banana plugs from the Kaiju outputs to a balanced connector for the monitors. They are powered, but that's what volume control is for :)
Title: Re: Transformer secondary windings and sonic differences
Post by: Paul Birkeland on December 06, 2020, 10:40:56 AM: I would just drive them with the BeePre.
Title: Re: Transformer secondary windings and sonic differences
Post by: johnsonad on December 06, 2020, 10:47:54 AM: I know and will ultimately do that but want to try both. Itâ€™s an easy cable to make and helps to pass time.