RCA 17 K This AINT GOOD..

10/13/2010 8:14:36 PMJesse Hancock

Have you ever done anything stupid, and then lost what you had worked so hard to accomplish? Well, While trying to check for a ground at the ocilator tube on this radio, I ran a wire from the ground to another ground, and guess what, Dial lamps dont light, radio only hums.. I feel so stupid.. Any Ideas????

10/13/2010 9:55:35 PMEdd

Sir Jessee. . . . .

What are the chances of those ground to grounds actually being a filament to filament / ground shorting and the resultant loss of filament supply voltage , hot wiring , along with an overload hummm.

. . . . . Hmmmmmmm ?

73's de Edd

:Have you ever done anything stupid, and then lost what you had worked so hard to accomplish? Well, While trying to check for a ground at the ocilator tube on this radio, I ran a wire from the ground to another ground, and guess what, Dial lamps dont light, radio only hums.. I feel so stupid.. Any Ideas????
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10/13/2010 10:10:11 PMJesse

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:Sir Jessee. . . . .
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:What are the chances of those ground to grounds actually being a filament to filament / ground shorting and the resultant loss of filament supply voltage , hot wiring , along with an overload hummm.
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:. . . . . Hmmmmmmm ?
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:73's de Edd
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::Have you ever done anything stupid, and then lost what you had worked so hard to accomplish? Well, While trying to check for a ground at the ocilator tube on this radio, I ran a wire from the ground to another ground, and guess what, Dial lamps dont light, radio only hums.. I feel so stupid.. Any Ideas????
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Well, upon further investigation, I found that the 6sa7 tube is cold, along with the 6SK7 as well, when the radio is powered up.. SO EDD, What do I do next?
I have never had this happen before.. HELP??

10/13/2010 10:24:12 PMMitch

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::Sir Jessee. . . . .
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::What are the chances of those ground to grounds actually being a filament to filament / ground shorting and the resultant loss of filament supply voltage , hot wiring , along with an overload hummm.
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::. . . . . Hmmmmmmm ?
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::73's de Edd
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:::Have you ever done anything stupid, and then lost what you had worked so hard to accomplish? Well, While trying to check for a ground at the ocilator tube on this radio, I ran a wire from the ground to another ground, and guess what, Dial lamps dont light, radio only hums.. I feel so stupid.. Any Ideas????
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:Well, upon further investigation, I found that the 6sa7 tube is cold, along with the 6SK7 as well, when the radio is powered up.. SO EDD, What do I do next?
:I have never had this happen before.. HELP??
:
Mitch

10/13/2010 10:36:43 PMjesse

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:::Sir Jessee. . . . .
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:::What are the chances of those ground to grounds actually being a filament to filament / ground shorting and the resultant loss of filament supply voltage , hot wiring , along with an overload hummm.
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:::. . . . . Hmmmmmmm ?
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:::73's de Edd
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::::Have you ever done anything stupid, and then lost what you had worked so hard to accomplish? Well, While trying to check for a ground at the ocilator tube on this radio, I ran a wire from the ground to another ground, and guess what, Dial lamps dont light, radio only hums.. I feel so stupid.. Any Ideas????
::::
:::
::Well, upon further investigation, I found that the 6sa7 tube is cold, along with the 6SK7 as well, when the radio is powered up.. SO EDD, What do I do next?
::I have never had this happen before.. HELP??
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:Your the ARK EDD, i wil follow.
:Mitch
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Mitch, if you have ideas please let me know.. I wonder did I toast a tube?

10/14/2010 1:12:51 AMWarren

Both tubes use pins 2 and 7 for the heater. Check with an ohm meter to see if the heaters are now open. As for the dial lamps. Remove them and see if they are burned out. Don't know what you may have accidentally done, but I am sure no permanent damage was done.

10/14/2010 2:21:58 AMEdd

Sir Jessee. . . . .

If you didn't short out the filament buss, your other option was having LIFTING filament connections to ground or lifting filament some connections themselves.

Consult the marked up schematic and down in the power transformer area you will see the YELLOW highlighting of the two 6VAC filament connections at the two BLUE boxes. Those individual wires then get run to the pilot lamps listed just to the right.

Look up to the tubes area next, and find the one tube with different connections, which will be the 6SF5.
One connection from the filament supply will be going to pin 7 while the other will be going to pin 8 which also is getting grounded.

As for all of the other tubes, that same line which fed the pin 8 grounded 6SF5, will ALSO be feeding each pin 2 of the 6K6, 6H6, 6SK7, 6SA7 and other 6SK7, and you also need to confirm any other connections at each tube that additionally gets connected to any other tube element as well as ground.

The other filament line that got connected to 6SF5 pin 7 is also getting connected to the 6K6, 6H6, 6SK7, 6SA7 and other 6SK7 tubes pin 7's.

If all of those above connections confirm, then you check for low resistance between the tubes filament pins when they are being tested out of their sockets.

Hopefully you will then be back to square one, with filaments lighting up, as well as your pilot lamps.

73's de Edd

Reference RCA 17K Mark Up:

10/14/2010 11:32:05 PM . . . . .errata . . . . .

Sir Jessee . . . . .

My prior posts dyslexic first paragraph needs to be amended to read as:

If your actions didn't short out the filament buss, your potential other options were of your possibly having LIFTED some of the filament connections going to ground or else the lifting loose of some of the filament supply connections to the unlit tubes themselves.

Consult the marked up schematic and down in the power transformer area, you will see the [YELLOW] highlighting of the two 6 VAC filament connections at the two BLUE boxes.

The main and initial filament routing from the power transformer is going to the item (5) tube which is the AF output tube and then the filament wiring is daisy chained around to the other adjoining tubes.

At some point, individual wires get routed over to the pilot lamps.

Look up to the tubes area next, and find the one tube with different connections, which will be the 6SF5.

One connection from the filament supply will be going to pin 7 while the other will be going to pin 8 which also is getting grounded.

The other filament line that got connected to 6SF5 pin 7 is also getting connected to the 6K6, 6H6, 6SK7, 6SA7 and other 6SK7 tubes pin 7's.

If all of those above connections confirm, then you check for low resistance between the tubes filament pins when they are being tested out of their sockets.

Hopefully you will then be back to square one, with all filaments lighting up, as well as your pilot lamps.

73's de Edd