Organ transformer impedance question

[gui_tarzan]

I picked up a Lowrey organ yesterday and it came with 7591 output tubes. The OT measures an impedance of 6.4k if I did my math right. A website I looked at has a chart of tubes that work with certain impedance transformers. It says the 6L6 needs 10K, this wouldn't work well with that setup up, would it?

[Dave H]

6.4k should be fine. I have a 6L6 data sheet showing an example with 6.6k for push pull 6L6s.

[gui_tarzan]

Cool. Thanks!