Thanks,
Dave...
Dave...
:Hello All,
: I have a GE 12T-3 TV chassis that I'm going to work on. I have the service data for the 12T-1, 2, and 7 but not 3. Are they all similar sets? There is that white resistor that always has a broken wire. It looks the same as the others I've worked on. If nobody knows, I'll compare and let everyone know.
:
:Thanks,
:
:Dave...
Dave...
:Hello All Again,
: I guess nobody knows the difference. I looked through my original GE service data on the other sets. When I count up the paper and filer capacitors by hand I get 35. When I look at the parts list I get 42. So the set I have in front of me has fewer capacitors in it, than the other models have.
: There are other differences but that was the answer I was looking for.
:
:Dave...
::Hello All,
:: I have a GE 12T-3 TV chassis that I'm going to work on. I have the service data for the 12T-1, 2, and 7 but not 3. Are they all similar sets? There is that white resistor that always has a broken wire. It looks the same as the others I've worked on. If nobody knows, I'll compare and let everyone know.
::
::Thanks,
::
::Dave...
Thanks again,
Dave...
:
:--------------------------------------------------------------------------------------------------------------------------------------------
:WOW.....that filamental string should be "currentmentally" challenged with a 133 ohm series dropping resistor....take a voltage check of the 19BG6's fil and see just how cool it was running.
:That sets dropping resistor for the entire filament string initially was two paralleled 10 watt wirewound 75 ohm resistors on the first chassis run , however the utilization of a single 35 ohm 15 watt wirewound unit was used on subsequent runs.The hot side of the AC line comes thru the thermal breaker to the power switch and then ties into this resistor.If lead length dress is adequate it would be advantageous to rest the units case against the case for extra thermal heatsinking of the unit. The other branching off of the hot AC line is to a 4.5 ohm 5 watt inrush surge resistor that feeds the voltage doubler circuit, incorporating two see-lenny-mum-yum rectum-fires.
:If you have that unit as a console....I thought that was one UG-LEE cabinet, however, I did have that unit a couple of years later as a 17 in kine tubed console.
:73's de Edd.
:---------------------------------------------------------------------------------------------------------------------------------------
::Hello All,
:: There are more differences than the capacitors. There are some component changes too.
:: I posted another message because I don't know the value of one of the resistors.
::
::Dave...
:::Hello All Again,
::: I guess nobody knows the difference. I looked through my original GE service data on the other sets. When I count up the paper and filer capacitors by hand I get 35. When I look at the parts list I get 42. So the set I have in front of me has fewer capacitors in it, than the other models have.
::: There are other differences but that was the answer I was looking for.
:::
:::Dave...
::::Hello All,
:::: I have a GE 12T-3 TV chassis that I'm going to work on. I have the service data for the 12T-1, 2, and 7 but not 3. Are they all similar sets? There is that white resistor that always has a broken wire. It looks the same as the others I've worked on. If nobody knows, I'll compare and let everyone know.
::::
::::Thanks,
::::
::::Dave...
:Edd,
: Thanks very very very much for that information. I thought it was something like that. I knew that 133 ohms was too high. It was just temporary. I replaced the voltage doubler selenuim rectifiers with modern silicon ones. I used a 50 ohm resistor in place of the 4.5. Is this wrong or is it ok like that? Should I put back the 4.5 and have a resistor in series with each modern diode instead? I have 7.5 ohm resistors but no 4.5s in stock.
:
:Thanks again,
:
:Dave...
::
::--------------------------------------------------------------------------------------------------------------------------------------------
::WOW.....that filamental string should be "currentmentally" challenged with a 133 ohm series dropping resistor....take a voltage check of the 19BG6's fil and see just how cool it was running.
::That sets dropping resistor for the entire filament string initially was two paralleled 10 watt wirewound 75 ohm resistors on the first chassis run , however the utilization of a single 35 ohm 15 watt wirewound unit was used on subsequent runs.The hot side of the AC line comes thru the thermal breaker to the power switch and then ties into this resistor.If lead length dress is adequate it would be advantageous to rest the units case against the case for extra thermal heatsinking of the unit. The other branching off of the hot AC line is to a 4.5 ohm 5 watt inrush surge resistor that feeds the voltage doubler circuit, incorporating two see-lenny-mum-yum rectum-fires.
::If you have that unit as a console....I thought that was one UG-LEE cabinet, however, I did have that unit a couple of years later as a 17 in kine tubed console.
::73's de Edd.
::---------------------------------------------------------------------------------------------------------------------------------------
:::Hello All,
::: There are more differences than the capacitors. There are some component changes too.
::: I posted another message because I don't know the value of one of the resistors.
:::
:::Dave...
::::Hello All Again,
:::: I guess nobody knows the difference. I looked through my original GE service data on the other sets. When I count up the paper and filer capacitors by hand I get 35. When I look at the parts list I get 42. So the set I have in front of me has fewer capacitors in it, than the other models have.
:::: There are other differences but that was the answer I was looking for.
::::
::::Dave...
:::::Hello All,
::::: I have a GE 12T-3 TV chassis that I'm going to work on. I have the service data for the 12T-1, 2, and 7 but not 3. Are they all similar sets? There is that white resistor that always has a broken wire. It looks the same as the others I've worked on. If nobody knows, I'll compare and let everyone know.
:::::
:::::Thanks,
:::::
:::::Dave...
Thanks Again,
Dave...
:-------------------------------------------------------------------------------------------------------------------------------------
:Since you have the schematics at hand...and I don't at this site..... just check out the raw B+ just out of the doubler ckt and adjust the initial 4.5 ohm droppping resistor up in value to bring it back down to its original specified level (with the brite at max on the kine).
:73's de Edd
:-----------------------------------------------------------------------------------------------------------------------------------------
:
::Edd,
:: Thanks very very very much for that information. I thought it was something like that. I knew that 133 ohms was too high. It was just temporary. I replaced the voltage doubler selenuim rectifiers with modern silicon ones. I used a 50 ohm resistor in place of the 4.5. Is this wrong or is it ok like that? Should I put back the 4.5 and have a resistor in series with each modern diode instead? I have 7.5 ohm resistors but no 4.5s in stock.
::
::Thanks again,
::
::Dave...
:::
:::--------------------------------------------------------------------------------------------------------------------------------------------
:::WOW.....that filamental string should be "currentmentally" challenged with a 133 ohm series dropping resistor....take a voltage check of the 19BG6's fil and see just how cool it was running.
:::That sets dropping resistor for the entire filament string initially was two paralleled 10 watt wirewound 75 ohm resistors on the first chassis run , however the utilization of a single 35 ohm 15 watt wirewound unit was used on subsequent runs.The hot side of the AC line comes thru the thermal breaker to the power switch and then ties into this resistor.If lead length dress is adequate it would be advantageous to rest the units case against the case for extra thermal heatsinking of the unit. The other branching off of the hot AC line is to a 4.5 ohm 5 watt inrush surge resistor that feeds the voltage doubler circuit, incorporating two see-lenny-mum-yum rectum-fires.
:::If you have that unit as a console....I thought that was one UG-LEE cabinet, however, I did have that unit a couple of years later as a 17 in kine tubed console.
:::73's de Edd.
:::---------------------------------------------------------------------------------------------------------------------------------------
::::Hello All,
:::: There are more differences than the capacitors. There are some component changes too.
:::: I posted another message because I don't know the value of one of the resistors.
::::
::::Dave...
:::::Hello All Again,
::::: I guess nobody knows the difference. I looked through my original GE service data on the other sets. When I count up the paper and filer capacitors by hand I get 35. When I look at the parts list I get 42. So the set I have in front of me has fewer capacitors in it, than the other models have.
::::: There are other differences but that was the answer I was looking for.
:::::
:::::Dave...
::::::Hello All,
:::::: I have a GE 12T-3 TV chassis that I'm going to work on. I have the service data for the 12T-1, 2, and 7 but not 3. Are they all similar sets? There is that white resistor that always has a broken wire. It looks the same as the others I've worked on. If nobody knows, I'll compare and let everyone know.
::::::
::::::Thanks,
::::::
::::::Dave...