weird observation with my A470 output transformers

Greeting,

While checking my st-70 for possible shortage, I noticed there is continuity between the chassis and every speaker posts. Thinking those speaker terminals were shortage somehow, I removed all wires and redo them all and tested without the output transformer wires connected. No continuity. I thought that was great and went ahead solder those wires back into place. I tested them again after soldered them and the continuity was there again. Is that behavior expected? if not, what's going on there? Any help is much appreciated. Thank you

Sichum wrote:Greeting,

While checking my st-70 for possible shortage, I noticed there is continuity between the chassis and every speaker posts. Thinking those speaker terminals were shortage somehow, I removed all wires and redo them all and tested without the output transformer wires connected. No continuity. I thought that was great and went ahead solder those wires back into place. I tested them again after soldered them and the continuity was there again. Is that behavior expected? if not, what's going on there? Any help is much appreciated. Thank you

The common output is grounded in the amp, this serves as reference as the 16ohm
is used for NFB

Have a look in the schematics !

peterh wrote:

Sichum wrote:Greeting,

While checking my st-70 for possible shortage, I noticed there is continuity between the chassis and every speaker posts. Thinking those speaker terminals were shortage somehow, I removed all wires and redo them all and tested without the output transformer wires connected. No continuity. I thought that was great and went ahead solder those wires back into place. I tested them again after soldered them and the continuity was there again. Is that behavior expected? if not, what's going on there? Any help is much appreciated. Thank you

The common output is grounded in the amp, this serves as reference as the 16ohm
is used for NFB

Have a look in the schematics !

much appreciated for your time. I read more about the NFB and starting to understand a bit more.