what does "J" mean in resistor values?

[ELS122]

I'm looking at the shematic for the Tesla Mono 130 amplifier, and most of the resistor values are understandable like "M82, 1M5, 1M, 4K7 etc." but there are a few resistors that have the values like "1J4, 3J3" are there 1.4Ohm and 3.3Ohm resistors?
also there are a few caps values like "G2, G1" I have no idea about these...

[garethw]

I’ve never seen J resistor values. Maybe post a capture of the schematic up?
I think the capacitor values are in pF. So G1 would be 1 billion pF (1000uF).

[ELS122]

I’ve never seen J resistor values. Maybe post a capture of the schematic up?
I think the capacitor values are in pF. So G1 would be 1 billion pF (1000uF).

no way that there are 450V 10mF caps in that amp
the "50uF" are valued like "50mkF" or something like that
I think that the "J" resistors are 1.4Ohm and 3.3Ohm, that would make sense.

 Tesla mono 130 shematic.pdf (89.28 kB - downloaded 117 times.)

[floobydust]

The special letter appears unique to the component on the schematic, like C302 "G2" and C311 "G5". So it must point to a particular part+rating. I've seen "J" meaning +/-5% tolerance on wirewound resistors. But 1.4 ohm cathode resistors seems quite low and a bit oddball value. They might even be jumpers, you open them to measure cathode current (at testpoint MB1, MB2) to set the balance potentiometers. That also makes sense to me. EL34 bias is around 30mA I guess 42mV is enough to measure.
Odd using an SCR and aux winding for a protection latch.

[ELS122]

The special letter appears unique to the component on the schematic, like C302 "G2" and C311 "G5". So it must point to a particular part+rating. I've seen "J" meaning +/-5% tolerance on wirewound resistors. But 1.4 ohm cathode resistors seems quite low and a bit oddball value. They might even be jumpers, you open them to measure cathode current (at testpoint MB1, MB2) to set the balance potentiometers. That also makes sense to me. EL34 bias is around 30mA I guess 42mV is enough to measure.
Odd using an SCR and aux winding for a protection latch.

why would 1.4Ohm cathode resistor seem high? it's fixed biased. maybe they want to measure like 20mV across it and bias it at that. which would be 28mA.

well, I'm drawing a more understandable schematic. and it seems it's taking some kind of feedback signal from the cathodes of the output tubes. the Thyristor or whatever it's meant to be, I looked up all the part numbers that are written on top and googling "KY130" showed a silicon diode, but googling "KY80" showed a tube diode
then googling "KT502" showed a transistor, I assume this is the part number for the Tryristor or whatever since all the other part numbers are either tubes or diodes. but I doubt that's a transistor in the schematic.

[ELS122]

here I made a possibly more understandable shematic: https://easyeda.com/evalc2636/tesla-mono-130-sheamtic

I now basically am confused with the capacitor values "G1, G2, G5"

[evava]

Yes, 1J4, 3J3 are 1.4Ohm and 3.3Ohm resistors.

Also caps values like "G2, G1", they mean 200microFarad resp. 100microFarad.

Because 1G means 1000microFarad.

As I was young we used that description commonly.

KT502 is thyristor.

[TimFox]

I have not seen the code "1J4" before, but I assume it means 1.4 ohms, 5% tolerance since "J" as a suffix in the more normal "1R4J" denotes 5% tolerance (K=10%, F=1% are other common suffices).
Probably done to save one precious space in the label, since sometimes wiring diagrams get crowded with complicated part values.  Incidentally, 1.2, 1.3, and 1.5 are the common values for 5% resistors, but not 1.4.