O.T. wiring

[chocopower]

Hi there!

2 questions:

1.- Any way to hardwire the output in the attached transformer for 8 and 16 ohm?  I mean, 2 jacks or 1 jack with a switch to choose 8 or 16.
2.- That transformer is working already in a old french amp.
     U.L. taps are used and i wanna disconnect them. Any change in secondaries impedance?


thanks in advance!

EDIT: Original attached file deleted due Intelectual Propierty problems.

[DummyLoad]

attached schema should work... can it be simplified? maybe?

requires a 4PDT switch.

--pete

[chocopower]

attached schema should work... can it be simplified? maybe?

requires a 4PDT switch.

--pete

Thanks a lot!!! 
I forget to tell that i had to switch the main outputs when i rewire from the original 16 ohm (as i get the amp) to 8 ohm.
The amp have NFB loop and i got a nice oscillation when i rewire to the 8 ohm combination.
Now, the NFB is disable, so:

Should i have any concern about the phase polarity in a amp without NFB?

[PRR]

I don't think you are allowed to re-post radiomuseum's images?

[chocopower]

Hi,

Sorry if i did something inappropriate.
I´m a Radiomuseum member, so i though that i can do it.
If it´s a problem, i delete the file.

[chocopower]

Ok, i have that link from another web.
i delete the original one from Radiomuseum.
Sorry for the inconveniences.

[stratele52]

I forget to tell that i had to switch the main outputs when i rewire from the original 16 ohm (as i get the amp) to 8 ohm.
The amp have NFB loop and i got a nice oscillation when i rewire to the 8 ohm combination.
Now, the NFB is disable, so:

Should i have any concern about the phase polarity in a amp without NFB?

IMO , the original NFB desing for a 16 ohms may need some different resistor value for 8 ohms. Copy value on other amp using 8 ohms and same Phase Inverter circuit.

Tu dois parler français pour être membre de Radiomuseum ?

[chocopower]

IMO , the original NFB desing for a 16 ohms may need some different resistor value for 8 ohms. Copy value on other amp using 8 ohms and same Phase Inverter circuit.

Tu dois parler français pour être membre de Radiomuseum ?

Sorry if i explain it wrong. I dont wanna use NFB at all. My question is about if i could have any problem connecting the OT leads in the "wrong" way. That happen when you do it wrong in a amp with NFB, isnt?

I dont speak French, but i dont need it to have my account and use the Radiomuseum archive. 

[stratele52]

  I dont wanna use NFB at all. My question is about if i could have any problem connecting the OT leads in the "wrong" way.

Sometimes yes , if output transformer did not see the speaker , open circuit.

[chocopower]

ok. i´ll check that to see if DummyLoad schematic can work.

thanks everybody and sorry for the problems i could generate posting the Radiomuseum pic.

[stratele52]

ok. i´ll check that to see if DummyLoad schematic can work.

thanks everybody and sorry for the problems i could generate posting the Radiomuseum pic.

I did not see any problem , you are welcome on the forum and there is not enough picture .