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Ian - G4JQT · 11th Dec 2018, 10:22 am

A question for the Ekco experts!

I'm restoring an A22 and have noticed a few circuit differences between real sets and the circuit. S/N 017772

There's a 1nF capacitor fitted across the input side of the LW antenna coil on my A22 which is not on either the Trader sheet 768 or Ekco service data.

The V2 anode coupling capacitor is given 50pF on Trader and Ekco sheets, but mine is marked and measures 15pF.

V2 suppressor grid is shown on Trader and Ekco sheets connected to V2 cathode (and its biassing arrangement), but mine is connected directly to the chassis.

Not sure if these are likely to be deliberate production changes or errors.

Can anyone throw any light on this?

Thanks.

Ian

11th Dec 2018, 10:22 am	#1
Ian - G4JQT Octode Join Date: Jun 2004 Location: Reading/Fakenham, UK. Posts: 1,325	Ekco A22 circuit changes A question for the Ekco experts! I'm restoring an A22 and have noticed a few circuit differences between real sets and the circuit. S/N 017772 There's a 1nF capacitor fitted across the input side of the LW antenna coil on my A22 which is not on either the Trader sheet 768 or Ekco service data. The V2 anode coupling capacitor is given 50pF on Trader and Ekco sheets, but mine is marked and measures 15pF. V2 suppressor grid is shown on Trader and Ekco sheets connected to V2 cathode (and its biassing arrangement), but mine is connected directly to the chassis. Not sure if these are likely to be deliberate production changes or errors. Can anyone throw any light on this? Thanks. Ian