Output impedance connections

[Guus]

Hi Guy's,

I have a question about output impedance of the OT.
The OT has 3 taps: 4, 8 and 16 ohms.

** Question 1:
When I connect a 8 ohm speaker on the 8 Ohm tap AND a 16 ohm speaker on the 16 ohm tap, the impedance stays on the same correct level?

** Question 2:
Taps of the OT that are not used, should they be closed to ground or stay open?
Or does this make electrical no difference?

** Question 3:
In Fender schematics I saw that Fender closes the outputtap to ground if no output jack is pluged in. This is to secure the OT?

regards
Guss

[martin manning]

I have a question about output impedance of the OT.
The OT has 3 taps: 4, 8 and 16 ohms.

** Question 1:
When I connect a 8 ohm speaker on the 8 Ohm tap AND a 16 ohm speaker on the 16 ohm tap, the impedance stays on the same correct level?

** Question 2:
Taps of the OT that are not used, should they be closed to ground or stay open?
Or does this make electrical no difference?

** Question 3:
In Fender schematics I saw that Fender closes the outputtap to ground if no output jack is pluged in. This is to secure the OT?

1) No. The load impedance will be half of the correct value.

2) Leave unused taps open (unconnected).

3) Yes the short to ground when no load is connected is to protect the OT. It provides a way for energy delivered to the OT to dissipate.

[Guus]

Hi Martin,

thanks for the quick response.
Answers 2 and 3: clear, I understand.
Answer 1: took me some longer to understand. When I made a drawing of the OT coil with the taps and the hooked up connections (impedances) on a paper, it showed me why the impedance changes.

Thanks,
Guss