Help! Speaker switch hammond 1650H

[Banjan73]

Sheit.
I am struggling to understand how to connect my Hammond 1650H to a speaker selector switch. Attached is a picture of the datasheet. What kind of switch do I need here to make use of all the impedances (4, 8 and 16ohms)? And how the #&%! do I connect it? Some braniacs out there? Would be nice with a simple schematic.

[Carlsoti]

Look at the documents/files for this. https://www.amplifiedparts.com/products/impedance-selector-switch-rotary-hammond-1600-series#:~:text=Switch%20%2D%20Rotary%20Impedance%20Selector%2C%20for%20Hammond,1/4%22%20output%20jack%20and%20black%20chicken%20head

[sluckey]

You need this switch to have all three impedance selections available.

That switch looks mighty flimsy to me. I opted to be able to only have 4Ω and 8Ω available. Connect the Grn and Grn/Yel leads together and connect the Blk and Blk/Yel together. Use the Grn for 4Ω and use the Yel for 8Ω. Now you can use a robust SPDT switch to toggle between 8 and 8.

In the future you may want to buy the easy wire secondary version of the 1650 transformer. Same price but with straightforward secondary winding.

[Banjan73]

Thanks to both of you.
Yeah, that secondary seemded ok when i glimpsed at it the first time.
But after scratching my head for a while, it gave up.
That switch seems nice, though. I will buy one of those.
P.S.
Why the €%# does Hammond provide this kind of secondary?

[sluckey]

Why the €%# does Hammond provide this kind of secondary?

You need to ask Hammond that question. There must be some advantage but I don't see it. Shortly after the 1650 OTs came on the market, Hammond introduced the easy wire 1650s. I suspect that easy wire version exists because of complaint about your issue.

The easy wire version for your OT is 1650HA. Look at this link for more info on the easy wire secondary.

[Banjan73]

Pff.
Shame I didn't know about that version before I ordered.
Anyway, think that "impossible"-wiring version is gonna work also..

[astronomicum]

The MOD 101 uses the 1650P with a 4-8-16 selector switch. Take a look at that.

[Banjan73]

Gee. Thanks for all info guys.
I have already ordered that switch. Who thought that such a simple selector switch would be that complicated...

[pdf64]

... Why the €%# does Hammond provide this kind of secondary?

It facilitates the best feasible coupling between primary amd secondary windings for all secondary connection options.
A hifi thing.

[Banjan73]

Aha!
Thx for info!