Dave Hunter's 2 Stroke and output tranny/speaker options

[NotSure]

Built Dave Hunter's 2 Stroke amp a long time ago. I've always used the setting that uses the entire output winding but with only an 8 ohm speaker. With the Hammond 125SE output tranny this only puts 2500 ohms on the primary. BUT if I use a 16 ohm speaker that puts 5000 Ohms on the primary side. So can I push the limit on this with say a 6L6, 4200 Ohm max load resistance, or really pushing it for a KT66 with only 2200 Ohms max load resistance. BTW the KT66 with a Celection Creamback 16 ohm speaker sounds killer. Don't want to burn up a $50.00 tube. Any comments appreciated.
Dave

[HotBluePlates]

... Don't want to burn up a $50.00 tube. ...

That probably won't happen.

... 16 ohm speaker that puts 5000 Ohms on the primary side. So can I push the limit on this with say a 6L6, 4200 Ohm max load resistance, or really pushing it for a KT66 with only 2200 Ohms max load resistance. ...

Try the amp with "16Ω speaker load" (5kΩ to Primary).
Try the amp with "8Ω speaker load" (2.5kΩ to Primary).

Whichever one is "louder" (assuming similar speaker sensitivity) is "the better load" for this amp, its voltage, etc.

The output transformer primary impedance just winds up setting a ratio of Voltage-change for the Current-change that happens when a signal is applied to the output tubes.  The "right load" delivers maximum output power, but that's a matter of supply voltage & overall design.

Most of the time, the "wrong load" is just going to deliver less-power before distortion.

[sluckey]

Just connect the 8Ω speaker to the yellow wire. That's what Dave would do.

     

[NotSure]

... Don't want to burn up a $50.00 tube. ...

That probably won't happen.

... 16 ohm speaker that puts 5000 Ohms on the primary side. So can I push the limit on this with say a 6L6, 4200 Ohm max load resistance, or really pushing it for a KT66 with only 2200 Ohms max load resistance. ...

Try the amp with "16Ω speaker load" (5kΩ to Primary).
Try the amp with "8Ω speaker load" (2.5kΩ to Primary).

Whichever one is "louder" (assuming similar speaker sensitivity) is "the better load" for this amp, its voltage, etc.

The output transformer primary impedance just winds up setting a ratio of Voltage-change for the Current-change that happens when a signal is applied to the output tubes.  The "right load" delivers maximum output power, but that's a matter of supply voltage & overall design.

Most of the time, the "wrong load" is just going to deliver less-power before distortion.

Thanks so much to HotBluePlates and Slukey. I kind of figured by common sense what you were both saying. But Slukey the late great Gerald Weber told me a long time ago to always use the entire winding of the output tranny. So the white wire is the go-to for the switch. But guess what dudes the Anthropic AI guy Claude said the same thing that HotBluePlates said. Much rather have it from you all than Claude
What a great resource. Thank you.Dave

[sluckey]

But Slukey the late great Gerald Weber told me a long time ago to always use the entire winding of the output tranny.

That may have been his opinion. But how do you explain so many multi-tap OTs? Plenty of OT manufacturers would disagree. I also disagree.

[NotSure]

  you all are the best. I've never seen anything from Slukey or HotBluePlates that have steared me wrong. So your response is way beyond my pay grade. 

[sluckey]

I've never seen anything from Slukey or HotBluePlates that have steared me wrong.

My name is SLUCKEY! That's not so hard to type, is it?

[NotSure]

So sorry man, not trying to disrespect anyone that provides the help that comes from this site. Just a typo. won't happen again.

[sluckey]

I never thought you meant any disrespect. But once is a typo. Twice is just lazy. At least you didn't call me "sucky".