Converting a positive ground valve/tube car radio to negativ

[nesesu]

On Jul 24, 7:43 am, oldcoot <oldcoot7...@sbcglobal.net> wrote:

 http://www.diversed.fsnet.co.uk/vib2.gif

There appears to be an error in this schematic. Someone else may
confirm.
The armature should be connected to common negative. Instead, the line
from the armature is shown 'jumping over' the common negative line. As
shown, this is an open circuit with no DC return path. Make the
correction by tying the armature to common neg., and operation of the
circuit becomes self-explanatory.

Um, it IS connected to common negative were the line comes down from
the armature terminal. From that point a line then goes to the bottom
end of the .1u input filter cap.

Neil S.

 

[oldcoot]

On Jul 24, 8:46 am, nesesu <neil_sutcli...@telus.net> wrote:

On Jul 24, 7:43 am, oldcoot <oldcoot7...@sbcglobal.net> wrote:

 http://www.diversed.fsnet.co.uk/vib2.gif

There appears to be an error in this schematic. Someone else may
confirm.
The armature should be connected to common negative. Instead, the line
from the armature is shown 'jumping over' the common negative line. As
shown, this is an open circuit with no DC return path. Make the
correction by tying the armature to common neg., and operation of the
circuit becomes self-explanatory.

Um, it IS connected to common negative were the line comes down from
the armature terminal. From that point a line then goes to the bottom
end of the .1u input filter cap.

Neil S.

Maybe the image I'm looking at is different than yours (if that's
possible), but mine clearly shows the line from the armature 'jumping
over' the negative DC bus, and ending at the bottom of the .1uf cap
(the bottom of this cap should also be tied to common neg., but
isn't). On my print, the 'jump over' symbol is clearly an error. John
B., Halp!
Bill(oc)

 

[Ken]

oldcoot wrote:

http://www.diversed.fsnet.co.uk/vib2.gif

There appears to be an error in this schematic. Someone else may
confirm.
The armature should be connected to common negative. Instead, the line
from the armature is shown 'jumping over' the common negative line. As
shown, this is an open circuit with no DC return path. Make the
correction by tying the armature to common neg., and operation of the
circuit becomes self-explanatory.


On diags that show the jump for no connection, lines crossing means

there is a connection. I like the connection represented by a dot, but
on some hard to read prints, this dot can disappear, leaving you
wondering, which is it. Ken