The M prefix was used to designate x 1000 muliplier in past years. Today, K ( or Kilo) is the prefix that designates x 1000 multiplier and M (or Meg) designates x 1,000,000
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:The M prefix was used to designate x 1000 muliplier in past years. Today, K ( or Kilo) is the prefix that designates x 1000 multiplier and M (or Meg) designates x 1,000,000
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Sir Mike . . . .
In a look at that sets parts list reveals the OHMS value referencing not being ambigous, as well as the few (5 or 6, resistors) that are upwards into the megohm values.
Then, only where you are seeing the specified M, do you need to plug in the current, modern K value instead.
And it does seem that the slight majority resistor count are k's.
73's de Edd
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:Thanks a bunch..again! That's what I thought, but my folks raised me to ask someone who knows for sure before proceeding. I found that right person through modern technology. Mike
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:Sir Mike . . . .
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:In a look at that sets parts list reveals the OHMS value referencing not being ambigous, as well as the few (5 or 6, resistors) that are upwards into the megohm values.
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: Then, only where you are seeing the specified M, do you need to plug in the current, modern K value instead.
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:And it does seem that the slight majority resistor count are k's.
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:73's de Edd
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::Thanks a bunch..again! That's what I thought, but my folks raised me to ask someone who knows for sure before proceeding. I found that right person through modern technology. Mike
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::Sir Mike . . . .
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::In a look at that sets parts list reveals the OHMS value referencing not being ambigous, as well as the few (5 or 6, resistors) that are upwards into the megohm values.
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:: Then, only where you are seeing the specified M, do you need to plug in the current, modern K value instead.
::
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::And it does seem that the slight majority resistor count are k's.
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::73's de Edd
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:Finally got back to this radio while waiting on final parts for RCA. During inspection of the chassis I found that a 35Z5 has been substituted for the 35Z4 and that a .1 mfd cap has been soldered across pins 1 and 6 of the 12SK7. This doesn't sound quite kosher to me but it may have been done for some reason I don't see at this point. Any ideas or suggestions at this point?? Thanks for any insight. Mike
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:::Thanks a bunch..again! That's what I thought, but my folks raised me to ask someone who knows for sure before proceeding. I found that right person through modern technology. Mike
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:::Sir Mike . . . .
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:::In a look at that sets parts list reveals the OHMS value referencing not being ambigous, as well as the few (5 or 6, resistors) that are upwards into the megohm values.
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::: Then, only where you are seeing the specified M, do you need to plug in the current, modern K value instead.
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:::And it does seem that the slight majority resistor count are k's.
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:::73's de Edd
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::Finally got back to this radio while waiting on final parts for RCA. During inspection of the chassis I found that a 35Z5 has been substituted for the 35Z4 and that a .1 mfd cap has been soldered across pins 1 and 6 of the 12SK7. This doesn't sound quite kosher to me but it may have been done for some reason I don't see at this point. Any ideas or suggestions at this point?? Thanks for any insight. Mike
35Z4 . . . 35Z5 . . . .same /same . . . as . . .poh-tay-toe . . .poh-tah-toe . . . unless your set has a pilot light and specifically has the need of the filament tap, such as the 35Z5 is having.
Also this possibility might have been reflected in the straight 692, versus the additional 692 A and B versions of that chassis.
Now as per the .1 ufd presence across the screen grid to ground of the 12SK7.
Check out the schematic and you will see C17 being shown in its SCHEMATIC positioning as shunting the C18 electrolytic filter capacitor. This is commonly done, in the respect of the C18 filtering the 60~ripple element while the companion .1 ufd is taking high of bypassing any elements way on up in the high frequency audio and more importantly, the RF spectrum.
Also it is more effective if placed nearby. .and make that heavy on the NEARBY . .its desired point of most bypassing.
If you will trace down all of the nodes that specific sub B+ line is feeding, you will see:
the screen grids of the 35L6,
plate supply of the 12Q7 ph inv,
plate supply of the 12Q7 1st AF amp,
[[[ the screen grid of the 12SK7]]],
the B+ suppy to the 12A8 local oscillator section,
the B+ supply to the 1st IF transformer,
the B+ supply to the 12A8 via R5
and you will note THAT stage rates FURTHER RF decoupling via C11 placed right AT its screen grid and supressor grids pin connections.
That may also suggest the logic for the location of the .1 ufd being placed RIGHT AT the pin connections of that 12SK7.
All of the wiring lead inductance of it being waaaay over at the C18 position would be negating its effectiveness at RF frequency bypassing, as compared to its being made short leaded and being physically located right at its source of needing a more optimal RF decoupling.
73's de Edd