Odd stub wire in Zenith
 

I have just started restoration of a Zenith "Universal" 6G601M [S/N T556876]
and have noted two odd things about the almost untouched chassis.

1. there is a sleeved wire coming from the grid of the 3Q5 output tube and
laying across the socket of the 117Z6 rectifier, but not connected at the
far end. According to the schematic and common sense, this wire serves no
purpose, but is clearly factory original. In photo see it coming from the
tag just behind the 2.2meg resistor and across the socket and ending over
the grey wire. Since the grid impedance is almost a megohm, one might think
it would pick up hum.

2. The orientation of the sockets for the 1LN4 IF and 1LH4 detector/1st
audio are substantially different than that shown in the Riders schematic
[Zenith Page 13-17] and the pin numbers are not shown on the schematic, only
the function callout on the socket voltage diagram. I have not noticed this
sort of error before.

Neil S.

Odd stub wire in Zenith
 

Neil S wrote:
I have just started restoration of a Zenith "Universal" 6G601M [S/N T556876]
and have noted two odd things about the almost untouched chassis.

1. there is a sleeved wire coming from the grid of the 3Q5 output tube and
laying across the socket of the 117Z6 rectifier, but not connected at the
far end. According to the schematic and common sense, this wire serves no
purpose, but is clearly factory original. In photo see it coming from the
tag just behind the 2.2meg resistor and across the socket and ending over
the grey wire. Since the grid impedance is almost a megohm, one might think
it would pick up hum.

2. The orientation of the sockets for the 1LN4 IF and 1LH4 detector/1st
audio are substantially different than that shown in the Riders schematic
[Zenith Page 13-17] and the pin numbers are not shown on the schematic, only
the function callout on the socket voltage diagram. I have not noticed this
sort of error before.

Neil S.



Are C9 and R6 in the circuit? Ken

Odd stub wire in Zenith
 

Yes, R6 is the 2.2meg resistor shown and C9 is the paper cap in the top left
with it's sleeved lead sloping down to the same tag. It is interesting that
the C9 lead and the 'odd' wire are of equal length.

Neil S.

"Ken" wrote in message
...
Neil S wrote:
I have just started restoration of a Zenith "Universal" 6G601M [S/N
T556876] and have noted two odd things about the almost untouched
chassis.

1. there is a sleeved wire coming from the grid of the 3Q5 output tube
and laying across the socket of the 117Z6 rectifier, but not connected at
the far end. According to the schematic and common sense, this wire
serves no purpose, but is clearly factory original. In photo see it
coming from the tag just behind the 2.2meg resistor and across the socket
and ending over the grey wire. Since the grid impedance is almost a
megohm, one might think it would pick up hum.

2. The orientation of the sockets for the 1LN4 IF and 1LH4 detector/1st
audio are substantially different than that shown in the Riders schematic
[Zenith Page 13-17] and the pin numbers are not shown on the schematic,
only the function callout on the socket voltage diagram. I have not
noticed this sort of error before.

Neil S.
Are C9 and R6 in the circuit? Ken

Odd stub wire in Zenith
 

This this out:

http://www.the-s38-guy.com/Page_63.html



"Neil S" wrote in message
news:uvLmj.14731$vp3.12734@edtnps90...
I have just started restoration of a Zenith "Universal" 6G601M [S/N
T556876] and have noted two odd things about the almost untouched chassis.

1. there is a sleeved wire coming from the grid of the 3Q5 output tube and
laying across the socket of the 117Z6 rectifier, but not connected at the
far end. According to the schematic and common sense, this wire serves no
purpose, but is clearly factory original. In photo see it coming from the
tag just behind the 2.2meg resistor and across the socket and ending over
the grey wire. Since the grid impedance is almost a megohm, one might
think it would pick up hum.

2. The orientation of the sockets for the 1LN4 IF and 1LH4 detector/1st
audio are substantially different than that shown in the Riders schematic
[Zenith Page 13-17] and the pin numbers are not shown on the schematic,
only the function callout on the socket voltage diagram. I have not
noticed this sort of error before.

Neil S.

Odd stub wire in Zenith
 

"Unrevealed Source"
wrote in message ...

http://www.the-s38-guy.com/Page_63.html

So this wire is, basically, a "gimmick".

Odd stub wire in Zenith
 

William Sommerwerck wrote:
"Unrevealed Source"
wrote in message ...

http://www.the-s38-guy.com/Page_63.html

So this wire is, basically, a "gimmick".




Yep..

I wondered what that odd wire in this Hallies on the bench was.
Now I know! Maybe I should double-check CW mode. ;-)

Odd stub wire in Zenith
 

"Unrevealed Source" wrote in message
...
This this out:

http://www.the-s38-guy.com/Page_63.html


Thanks for the post

Paul P.

Odd stub wire in Zenith
 

There is a wire like that in the Hallicrafter s-40 series. Its purpose
is a small value capacitor. Instead of useing a real cap they just lay
or twist a small length of wire up to get the required capacitance.





On Sat, 26 Jan 2008 19:04:58 GMT, "Neil S"
wrote:

I have just started restoration of a Zenith "Universal" 6G601M [S/N T556876]
and have noted two odd things about the almost untouched chassis.

1. there is a sleeved wire coming from the grid of the 3Q5 output tube and
laying across the socket of the 117Z6 rectifier, but not connected at the
far end. According to the schematic and common sense, this wire serves no
purpose, but is clearly factory original. In photo see it coming from the
tag just behind the 2.2meg resistor and across the socket and ending over
the grey wire. Since the grid impedance is almost a megohm, one might think
it would pick up hum.

2. The orientation of the sockets for the 1LN4 IF and 1LH4 detector/1st
audio are substantially different than that shown in the Riders schematic
[Zenith Page 13-17] and the pin numbers are not shown on the schematic, only
the function callout on the socket voltage diagram. I have not noticed this
sort of error before.

Neil S.

Odd stub wire in Zenith and Line Caps
 

The mystery was resolved when I removed the paper cap C9 and discovered it
was a replacement, done back around the late '40s or so, with a cap not
unlike the ones Zenith used. The job was very well done, except that the
sleeved lead he clipped off at the old cap body was left behind. That also
explains why the sleeved 'stub' is exactly as long as the capacitor lead
above.
While I was restuffing the caps, I found that the 'across the line' cap C6
had failed and the lead spiral had been dislodged from the capacitor roll
and some arcing had taken place. It undoubtedly would have gone 'pop' when
it happened. The cap is certainly different from the 'normal' paper caps
used and is marked as 0.05uF 400VDC and has a different stock number than
called in the parts list.

Neil S.

1. there is a sleeved wire coming from the grid of the 3Q5 output tube
and laying across the socket of the 117Z6 rectifier, but not connected
at
the far end. According to the schematic and common sense, this wire
serves no purpose, but is clearly factory original. In photo see it
coming from the tag just behind the 2.2meg resistor and across the
socket
and ending over the grey wire. Since the grid impedance is almost a
megohm, one might think it would pick up hum.

Neil S.
Are C9 and R6 in the circuit? Ken

Odd stub wire in Zenith
 

On Mon, 28 Jan 2008 14:10:42 -0500, spasiba
wrote:

There is a wire like that in the Hallicrafter s-40 series. Its purpose
is a small value capacitor. Instead of useing a real cap they just lay
or twist a small length of wire up to get the required capacitance.


1. there is a sleeved wire coming from the grid of the 3Q5 output tube and
laying across the socket of the 117Z6 rectifier, but not connected at the

Yes these "gimmick" capacitors are used extensively in radios, but in
this case, why have this capacitance from the grid of the audio output
to the rectifier ?

Peter Dettmann