Making sense of a rca 17k schematic

11/17/2009 9:00:21 PMJesse Hancock

Can Someone give me some advice? I am currently trying to recap my father in laws old radio. When I look at the schematic I see something Ive never seen..
When I look at the tube sockets instead of pin numbers, Im seeing letters.. Like G, and H, which I assume is Grid and Heaters? I dont see P for plate, but can someone guide me? Also on this schematic, I see Caps listed as Stock numbers.. I see a three wax caps 2 of them are .005 @ 1000 .. This is still .005 mfd @ 1000 Volts? Thank you in advance for anyones help.

11/17/2009 9:19:15 PMCarl Crabtree

:Can Someone give me some advice? I am currently trying to recap my father in laws old radio. When I look at the schematic I see something Ive never seen..
:When I look at the tube sockets instead of pin numbers, Im seeing letters.. Like G, and H, which I assume is Grid and Heaters? I dont see P for plate, but can someone guide me? Also on this schematic, I see Caps listed as Stock numbers.. I see a three wax caps 2 of them are .005 @ 1000 .. This is still .005 mfd @ 1000 Volts? Thank you in advance for anyones help.
:

Jesse: I don't know what schematic you're looking at but the one at Tech Preservation gives values for caps and labels pins, but it also indicates the key position which will let you number the pins if you find that helpful in interpreting the schema.

11/17/2009 9:37:02 PMJesse to Carl

::Can Someone give me some advice? I am currently trying to recap my father in laws old radio. When I look at the schematic I see something Ive never seen..
::When I look at the tube sockets instead of pin numbers, Im seeing letters.. Like G, and H, which I assume is Grid and Heaters? I dont see P for plate, but can someone guide me? Also on this schematic, I see Caps listed as Stock numbers.. I see a three wax caps 2 of them are .005 @ 1000 .. This is still .005 mfd @ 1000 Volts? Thank you in advance for anyones help.
::
:
:Jesse: I don't know what schematic you're looking at but the one at Tech Preservation gives values for caps and labels pins, but it also indicates the key position which will let you number the pins if you find that helpful in interpreting the schema.
:
Could you please pass that URL along for that site? Thanks in Advance.

11/18/2009 1:45:57 PMAndy Rolfe

Jesse: Try techpreservation.dyndns.org/schematics/manufacturer.htm

Andy

:::Can Someone give me some advice? I am currently trying to recap my father in laws old radio. When I look at the schematic I see something Ive never seen..
:::When I look at the tube sockets instead of pin numbers, Im seeing letters.. Like G, and H, which I assume is Grid and Heaters? I dont see P for plate, but can someone guide me? Also on this schematic, I see Caps listed as Stock numbers.. I see a three wax caps 2 of them are .005 @ 1000 .. This is still .005 mfd @ 1000 Volts? Thank you in advance for anyones help.
:::
::
::Jesse: I don't know what schematic you're looking at but the one at Tech Preservation gives values for caps and labels pins, but it also indicates the key position which will let you number the pins if you find that helpful in interpreting the schema.
::
:
:Carl,
:Could you please pass that URL along for that site? Thanks in Advance.
:

11/19/2009 4:27:07 AMEdd

Sir Jesse. . . . .

When I look at the tube sockets instead of pin numbers, Im seeing letters..

Like G, and H, which I assume is Grid and Heaters? I dont see P for plate, but can someone guide me?

Preeeeecisely . . .Ready for the . . . . . .Rest of the story ?:

As is being encountered on this particular schematic,

Sh . . . Shield (In the case of a metal tube being used, a connection to the outer metal housing of the tube. . .its shield.)

F . . . . . Filament

K . . . . . Cathode

G . . . . . 1st Grid

SG . . . . Screen Grid

SuG . . . Suppressor Grid

And in the case of the specific case of the 6SA7:

OG . . . . Oscillator Grid

And in the case of the dual section diode of the 6H6:

K1 . . . . . Cathode of diode section 1

K2. . . . . Cathode of diode section 2

A1. . . . . Anode (Plate) of diode section 1

A2. . . . . Anode (Plate) of diode section 2

Also on this schematic, I see Caps listed as Stock numbers.. I see a three wax caps 2 of them are .005 @ 1000 ..

This is still .005 mfd @ 1000 Volts?

For sure the C43 is one of them with it being subjected to the full peak to peak excursions of voltage across the AF output transformer, if being at high audio levels.

Some other, more critical application caps are:

C38 . . . . . Coupling the plate of the AF amp to the 1st grid of the AF output tube

C40 . . . . . Tone shaping capacitor of the AF amp

C31 . . . . . AVC decoupling /time constant capacitor

C33 . . . . . AF coupling capacitor

C49 . . . . . AF coupling capacitor

PLUS . .I'll just bet that you didn't have ALL of the plug ins for Deja Vu acquisition of this schematic, so I have pulled and posted it.

I am taking the AF Amp 6SF5 and marking up its circular numbering around it.

Starting at the index referencng of the tube key gap at the top.

73's de Edd

11/19/2009 4:30:28 AMEdd . . .What ? schematic(81535:81534)

Sir Jesse. . . . .

When I look at the tube sockets instead of pin numbers, Im seeing letters..

Like G, and H, which I assume is Grid and Heaters? I dont see P for plate, but can someone guide me?

Preeeeecisely . . .Ready for the . . . . . .Rest of the story ?:

As is being encountered on this particular schematic,

Sh . . . Shield (In the case of a metal tube being used, a connection to the outer metal housing of the tube. . .its shield.)

F . . . . . Filament

K . . . . . Cathode

G . . . . . 1st Grid

SG . . . . Screen Grid

SuG . . . Suppressor Grid

And in the case of the specific case of the 6SA7:

OG . . . . Oscillator Grid

And in the case of the dual section diode of the 6H6:

K1 . . . . . Cathode of diode section 1

K2. . . . . Cathode of diode section 2

A1. . . . . Anode (Plate) of diode section 1

A2. . . . . Anode (Plate) of diode section 2

Also on this schematic, I see Caps listed as Stock numbers.. I see a three wax caps 2 of them are .005 @ 1000 ..

This is still .005 mfd @ 1000 Volts?

For sure the C43 is one of them with it being subjected to the full peak to peak excursions of voltage across the AF output transformer, if being at high audio levels.

Some other, more critical application caps are:

C38 . . . . . Coupling the plate of the AF amp to the 1st grid of the AF output tube

C40 . . . . . Tone shaping capacitor of the AF amp

C31 . . . . . AVC decoupling /time constant capacitor

C33 . . . . . AF coupling capacitor

C49 . . . . . AF coupling capacitor

PLUS . .I'll just bet that you didn't have ALL of the plug ins for Deja Vu acquisition of this schematic, so I have pulled and posted it.

I am taking the AF Amp 6SF5 and marking up its circular numbering around it.

Starting at the index referencng of the tube key gap at the top.

73's de Edd

RCA Model 17K:

11/21/2009 6:29:52 PMThomas Dermody(81626:81535)

Once you memorize the bottom-view orientation of octal pins, you will find that RCA's labelling method is a better one, because you really don't need to know what numbers the pins are (since you have that memorized), but rather what the pins actually connect to within each tube, since sometimes the wiring and symbols within a tube schematic can be quite squished, making it very difficult to deciphor what is connected to what.
....And amazingly that paragraph is all one sentence, and it doesn't seem to run on, either! I don't know how I managed to do that.
T.

11/26/2009 9:34:31 AMJesse Hancock(81814:81626)

:....And amazingly that paragraph is all one sentence, and it doesn't seem to run on, either! I don't know how I managed to do that.
Was this saying something to me? As in something rather curt, or being cute?

11/26/2009 10:34:22 AMThomas Dermody(81817:81814)

That was a comment regarding myself, not anyone else. I was just surprised that I was able to make a paragraph out of a sentence.
T>