I'm confused!

C5 is in the AGC/gain control. It is not anything to to do with B+, and I don't think it should have anything like 100V on it. It is in the the cathode circuit .(well, maybe if it's open circuit)

In fact, C5 gets shorted out when the 50K gain control is at max. The radio will not work without either a jumper or the 50K control in circuit.

Note that it is wired to pin 1 of the front interface . You can jumper C5 to ground for test purposes.

Last time you had problems in a different area, If mammary serves. Did you resolve that issue?

Does the radio work at all yet?

On Thursday, February 3, 2022, 05:58:58 PM EST, Chris Hu <[email protected]> wrote:

Hello,

I'm trying to solve a problem with the C-5 capacitor in my receiver BC-454

According to the "Resistance to ground from receivers terminals" 300.000 Ohms. is the leaking resistance of C-5.

In my case I have 400.000ohms without C-5.And voltage of 230V on terminals 3 & 5 of V3, 8 of V4 and 3 & 5 of V5.

Once C-5 is connected, I get 3500.000ohms and 110v voltage.I'm sure C-5 is not working properly.

I replaced C-5 for a cap 3uF 300V and not solution.Voltage do not drop to 4V as it should be.

Resistance is still higher, it's around 400K ohms when it should be around 300K.

Please any idea or help to get good resistance and voltage.??

All the test are done without Dyna or tubes.

Regards,

Christian

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