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[Telefunk]

Hi Klaus,

We're building a half of C24 clone. (from the schematic)

Now everything is almost there but can you confirm if we are in ballpark with operating voltages:

-B+ 129V
-pattern voltages from PSU 0v-55v-111v
-heater 6,1V
-tube plate 75V
-cathode 1,4v

[Telefunk]

And one more question:

There is a 2,5k resistor for the cathode bias in the C24 schematic. ELA M251E uses 1,8k.

Which one should i choose?

[klaus]

Use 2.7kΩ, as prescribed in most AKG C24 schematics. The ELA M 251 has a different circuit, with different input impedances.