help with these resistors

[zephyrblau]

can some kind soul help me understand the result of these values. CC = ~ 18K & the other ~ 1.2K. the layout calls for 10M in these positions. the patient is my '51 Super. also appears as though the filter caps have been changed to 30uf (vs. the original 20) at some point along the way.
all feedback appreciated.
TIA
jerry

[pdf64]

Is there a problem, or are you just looking into the discrepancy?
These parts are in the power supply. The schematic shows that the resistors should both be 10k (not 10M).
http://www.ampwares.com/schematics/super_5c4.pdf
The right resistor looks like a 1k8 2 watt carbon flim type. If that was fitted between the plate and screen power supply nodes, then the power output from the amp would probably increase a little, especially when overdriven. So not a good idea if the speakers are original.
The left resistor looks 10k carbon comp, maybe 1 watt. It could be original. It's value may have drifted out of spec, but you'd need to lift a leg to check it.
I would replace these with metal film flameproof resistors.
The increase in cap value may reduce hum a little, though as the important reservoir cap was two 16uF in parallel, and now looks as if it may be a single 30uF cap, then that is equivilant to stock. Pete.

[zephyrblau]

hi Pete;
thanks for the input. the amp works, but has had some repairs along the way that i'm attempting to reverse. (mostly in the signal path; OT, carbon film resistors, polypropolene caps, etc.) The circuit is a 5B4

http://www.ampwares.com/schematics/super_5b4_layout.pdf

i can't find the schematic, but per the layout, the power supply resistors are listed as 10M. you're right about the values & ratings currently in place.
your recommendation of metal film is well taken.
thanks again!
jerry

[Jazz P Bass]

The dropping resistors are both 10K, 1 watt resistors.
What appears to be an M on the layout is actually a K.
The draftsman did the same thing on the 5E4-A.
The 5C4 is close enough as far as the schematic goes.
They started to use a 12AY7 instead of the 6SC7 on the input.
12AX7 on the Phase inverter.
They also changed the coupling caps from .05 to .1uf.
Bigger power supply caps.
I hope you did not mistake the M on the other resistors.
They should all read K.
When in doubt, consult the 5C4 schematic.
It is at least readable.

[zephyrblau]

good point. after looking closer @ the layout, the draftsman spells out MEG as appropriate. comparing similar circuits 10M does seem odd.
off to round up parts.
thanks again to all.
best
jerry