[ARC5] Capacitor C-5 in BC-454

[David Stinson]

Hello.
I'm not sure I completely understand the problem.
If you have 230V one 3 and 5  of V3, you have no
tube cathode path to ground.  This is supplied in
installation by the gain control in the control head
to ground.  You can connect a 25K pot between
rear pin 3 or front pin 1 to ground as a gain
control and you will then have proper voltages
at those tube pins.  C5 is not often bad.

GL OM DE Dave AB5S

On 2/3/2022 4:58 PM, Chris Hu 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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