Heath VTVM Model IM-11

12/24/2012 8:17:06 PMMitch

Hello everyone,

Another customer repair. I have several schematics for the heath VTVM's but not this one.

I has three measurement cables, black for ground red for ohms/ac and the phono plug for dc.

The wire for the red banana plug has been cut off and i do not know where it goes. Also what the resistor for the dc plug would be.

A close schematic would help so i could determine the resistances for the ohms, ac and dc circuits.

Thank you and Merry Christmas,

Mitch

12/24/2012 10:42:38 PMCarl T

:Hello everyone,
:
:Another customer repair. I have several schematics for the heath VTVM's but not this one.
:
:I has three measurement cables, black for ground red for ohms/ac and the phono plug for dc.
:
:The wire for the red banana plug has been cut off and i do not know where it goes. Also what the resistor for the dc plug would be.
:
:A close schematic would help so i could determine the resistances for the ohms, ac and dc circuits.
:
:Thank you and Merry Christmas,
:
:Mitch
:
Mitch,
You can find the schematic here:
http://www.vintage-radio.info/heathkit/index.htm
Carl T

12/24/2012 11:18:48 PMMitch

::Hello everyone,
::
::Another customer repair. I have several schematics for the heath VTVM's but not this one.
::
::I has three measurement cables, black for ground red for ohms/ac and the phono plug for dc.
::
::The wire for the red banana plug has been cut off and i do not know where it goes. Also what the resistor for the dc plug would be.
::
::A close schematic would help so i could determine the resistances for the ohms, ac and dc circuits.
::
::Thank you and Merry Christmas,
::
::Mitch
::
:Mitch,
:You can find the schematic here:
:http://www.vintage-radio.info/heathkit/index.htm
:Carl T
:
Thank you Carl T,

After looking at the circuit there is no question that you have provided me with the correct schematic.
Excellent, and thank you again.

It would appear that the red banana plug was not necessary if you used a switching probe for DC volts and AC/OHMS measurements. All measurements would go to a common point in the circuit from the probe either with the 1 Meg. resistor or just straight through. I think the red probe would be connected to the input of the phono probe as a seperate input for AC/OHMS and the phono probe not being used. Sound correct?

Thanks,

Mitch

12/26/2012 10:22:51 AMLewis

:::Hello everyone,
:::
:::Another customer repair. I have several schematics for the heath VTVM's but not this one.
:::
:::I has three measurement cables, black for ground red for ohms/ac and the phono plug for dc.
:::
:::The wire for the red banana plug has been cut off and i do not know where it goes. Also what the resistor for the dc plug would be.
:::
:::A close schematic would help so i could determine the resistances for the ohms, ac and dc circuits.
:::
:::Thank you and Merry Christmas,
:::
:::Mitch
:::
::Mitch,
::You can find the schematic here:
::http://www.vintage-radio.info/heathkit/index.htm
::Carl T
::
:Thank you Carl T,
:
:After looking at the circuit there is no question that you have provided me with the correct schematic.
:Excellent, and thank you again.
:
:It would appear that the red banana plug was not necessary if you used a switching probe for DC volts and AC/OHMS measurements. All measurements would go to a common point in the circuit from the probe either with the 1 Meg. resistor or just straight through. I think the red probe would be connected to the input of the phono probe as a seperate input for AC/OHMS and the phono probe not being used. Sound correct?
:
:Thanks,
:
:Mitch

I think you might be referring to an IM-10, which had seperate probes going to different wafers on the function switch.

For what is's worth, I have the guts to an IM-14 (I think) that I boutght on Ebay to replace my old VTVM whose meter died, but after seeing the condition of the Heath, I just swapped meters and used the case for to make a signal tracer. I have the circuit board and the transformer, switches, resistors, etc. for the IM-14 someone can have for the shipping.
Lewis
:

12/26/2012 10:26:28 AMLewis L.

::::Hello everyone,
::::
::::Another customer repair. I have several schematics for the heath VTVM's but not this one.
::::
::::I has three measurement cables, black for ground red for ohms/ac and the phono plug for dc.
::::
::::The wire for the red banana plug has been cut off and i do not know where it goes. Also what the resistor for the dc plug would be.
::::
::::A close schematic would help so i could determine the resistances for the ohms, ac and dc circuits.
::::
::::Thank you and Merry Christmas,
::::
::::Mitch
::::
:::Mitch,
:::You can find the schematic here:
:::http://www.vintage-radio.info/heathkit/index.htm
:::Carl T
:::
::Thank you Carl T,
::
::After looking at the circuit there is no question that you have provided me with the correct schematic.
::Excellent, and thank you again.
::
::It would appear that the red banana plug was not necessary if you used a switching probe for DC volts and AC/OHMS measurements. All measurements would go to a common point in the circuit from the probe either with the 1 Meg. resistor or just straight through. I think the red probe would be connected to the input of the phono probe as a seperate input for AC/OHMS and the phono probe not being used. Sound correct?
::
::Thanks,
::
::Mitch
:
:I think you might be referring to an IM-10, which had seperate probes going to different wafers on the function switch.
:
:For what is's worth, I have the guts to an IM-14 (I think) that I boutght on Ebay to replace my old VTVM whose meter died, but after seeing the condition of the Heath, I just swapped meters and used the case for to make a signal tracer. I have the circuit board and the transformer, switches, resistors, etc. for the IM-14 someone can have for the shipping.
:Lewis

Maybe that is an IM-11, thumb to kink of it.
Lewis
::
:
:

12/26/2012 5:11:29 PMMitch

:::::Hello everyone,
:::::
:::::Another customer repair. I have several schematics for the heath VTVM's but not this one.
:::::
:::::I has three measurement cables, black for ground red for ohms/ac and the phono plug for dc.
:::::
:::::The wire for the red banana plug has been cut off and i do not know where it goes. Also what the resistor for the dc plug would be.
:::::
:::::A close schematic would help so i could determine the resistances for the ohms, ac and dc circuits.
:::::
:::::Thank you and Merry Christmas,
:::::
:::::Mitch
:::::
::::Mitch,
::::You can find the schematic here:
::::http://www.vintage-radio.info/heathkit/index.htm
::::Carl T
::::
:::Thank you Carl T,
:::
:::After looking at the circuit there is no question that you have provided me with the correct schematic.
:::Excellent, and thank you again.
:::
:::It would appear that the red banana plug was not necessary if you used a switching probe for DC volts and AC/OHMS measurements. All measurements would go to a common point in the circuit from the probe either with the 1 Meg. resistor or just straight through. I think the red probe would be connected to the input of the phono probe as a seperate input for AC/OHMS and the phono probe not being used. Sound correct?
:::
:::Thanks,
:::
:::Mitch
::
::I think you might be referring to an IM-10, which had seperate probes going to different wafers on the function switch.
::
::For what is's worth, I have the guts to an IM-14 (I think) that I boutght on Ebay to replace my old VTVM whose meter died, but after seeing the condition of the Heath, I just swapped meters and used the case for to make a signal tracer. I have the circuit board and the transformer, switches, resistors, etc. for the IM-14 someone can have for the shipping.
::Lewis
:
:Maybe that is an IM-11, thumb to kink of it.
:Lewis
:::
::
::
:
:
Hello Lewis,

The model # on the cabinet says IM-11 but has the three seperate inputs. The chassis is a IM-10 according to the resistor values. Someone wired the AC/OHMS directly from the Phono plug to the wrong wafer trying to use it as a IM-11. I have the customers probes and will take it back to a IM-10 using seperate probes.

Thanks for looking into this for me.

Mitch

12/26/2012 6:32:07 PMLewis L.

::::::Hello everyone,
::::::
::::::Another customer repair. I have several schematics for the heath VTVM's but not this one.
::::::
::::::I has three measurement cables, black for ground red for ohms/ac and the phono plug for dc.
::::::
::::::The wire for the red banana plug has been cut off and i do not know where it goes. Also what the resistor for the dc plug would be.
::::::
::::::A close schematic would help so i could determine the resistances for the ohms, ac and dc circuits.
::::::
::::::Thank you and Merry Christmas,
::::::
::::::Mitch
::::::
:::::Mitch,
:::::You can find the schematic here:
:::::http://www.vintage-radio.info/heathkit/index.htm
:::::Carl T
:::::
::::Thank you Carl T,
::::
::::After looking at the circuit there is no question that you have provided me with the correct schematic.
::::Excellent, and thank you again.
::::
::::It would appear that the red banana plug was not necessary if you used a switching probe for DC volts and AC/OHMS measurements. All measurements would go to a common point in the circuit from the probe either with the 1 Meg. resistor or just straight through. I think the red probe would be connected to the input of the phono probe as a seperate input for AC/OHMS and the phono probe not being used. Sound correct?
::::
::::Thanks,
::::
::::Mitch
:::
:::I think you might be referring to an IM-10, which had seperate probes going to different wafers on the function switch.
:::
:::For what is's worth, I have the guts to an IM-14 (I think) that I boutght on Ebay to replace my old VTVM whose meter died, but after seeing the condition of the Heath, I just swapped meters and used the case for to make a signal tracer. I have the circuit board and the transformer, switches, resistors, etc. for the IM-14 someone can have for the shipping.
:::Lewis
::
::Maybe that is an IM-11, thumb to kink of it.
::Lewis
::::
:::
:::
::
::
:Hello Lewis,
:
:The model # on the cabinet says IM-11 but has the three seperate inputs. The chassis is a IM-10 according to the resistor values. Someone wired the AC/OHMS directly from the Phono plug to the wrong wafer trying to use it as a IM-11. I have the customers probes and will take it back to a IM-10 using seperate probes.
:
:Thanks for looking into this for me.
:
:Mitch

Sounds like you are taking a beating on this one.
It's enough trouble working on things that are as they came out of the factory. Having some genius engineer a modification really taxes my patience.

Lewis