Differently from what you think, filament voltage must stay within a few =
percent from nominal as it is very critical for tube life You can be =
sure that Collins designed the transformer for exactly 5V on the =
rectifiers and 6.3V on the other tubes, plus /minus just perhaps one =
percent, when line voltage is nominal.

So, if I measure exactly 5V and 6.3V on the filaments, it means that my =
line voltage is OK. And I also have an accurate line voltage meter that =
witnesses that.

So, differently from what you think, the problem is that the RATIO =
between the transformer high-voltage and filament voltage, which appears =
to be higher than it should be
=20
Tony, I0JX

"GBrown" ha scritto nel messaggio =
...
A 10% increase in line voltage will affect the hv secondary but not =
the
filament voltage as you mite think. See below.
120 line X 10% =3D 132
750 hv X 10% =3D 825
6.3 filament X 10% =3D 6.9 Still within the ballpark.
Note, most all transformer filament voltages are not what you mite =
think
they are. For instance, 6.3 volts could be as much as 7 volts, 13.8 =
could be
15 volts, 5 volts could be as much as 5-1/2 volts. This also holds =
true with
hv secondary. Line voltage fluctuations affect the transformer =
outputs,
before any regulation.
My two cents.
Gary
=20
=20
"Antonio I0JX" wrote in message
...
Can't understand that question: if filaments voltage is OK, it means =
that
line voltage is OK.
=20
Tony, I0JX
=20
"Scott Dorsey" ha scritto nel messaggio
...
Antonio I0JX wrote:
AC voltages do not vary whether using a solid state or tube =
rectifier. =3D
By the way I still have the 5U4 and 5R4. My problem is that the AC =
=3D
voltages are high (and hence the DC ones).

Is your line voltage high?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
=20