What is this, a local NFB ??

[kagliostro]

There is a part on this schematic that I'm not sure to understand correctly

What is the Blue Jumper on the top of the schematic ? Is it a local NFB ?

Thanks

Franco

p.s.: whole schematic here

https://el34world.com/Forum/index.php?topic=32959.0

https://el34world.com/Forum/index.php?topic=32959.0

[Merlin]

Technically it is posisitive feedback. But it looks like V1B used to be a reverb driver, and someone has converted it into a signal path for more gain.

[kagliostro]

Many thanks

Yes, the owner of the amp asked to the builder to mod it (unfortunately without a great success, on the thread I linked there are detailed info about)

Franco

[Merlin]

Link doesn't work for me

[kagliostro]

I apologize

may be something that has to do with the phone SO or I did something wrong

try this link https://el34world.com/Forum/index.php?topic=32959.0

The title of the thread (on this forum) is: 4x 6v6 Donor amp head - Any conversion suggestions


Franco