[Heathkit] DX-60B HV DC Output

[Mark K3MSB]

The -38 is on the 6146 and the specified -115V is on the Driver.

Mark

On Fri, Jul 23, 2021 at 5:12 PM <hwhall at compuserve.com> wrote:

> >You can't go from the same source voltage through 22K to the 6146 and
> have
> -38V,  and through 22K and then 18K + 4.7K and have -115 volts.<
>
> You might, if those 6146 connections are to different pins (i.e.,
> different tube elements) because (for example) plate current differs from
> screen grid current which differs from control grid current which differs
> from cathode current. Different current drawn through different resistances
> will result in different voltage drops. I note that your concern  is
> different pin voltages at different pins - aren't those different elements
> in the 6146?
>
> Wayne
> WB4OGM
>
> -----Original Message-----
> From: Mark K3MSB <mark.k3msb at gmail.com>
> To: Heathkit List QTH <heathkit at mailman.qth.net>
> Sent: Fri, Jul 23, 2021 11:42 am
> Subject: Re: [Heathkit] DX-60B HV DC Output
>
> Making progress.    I have a question on the schematics.
>
> I measure the bias at -130V at the junction of C37/C38.    If you go
> through R30 (22K) to Pin 5 of the 6146 the bias voltage is supposed to be
> -38V as indicated on the schematics.  We can ignore the parallel
> combination of R11 and R12 as R30 is significantly higher.
>
> Now, If I go through the same R30,  then R10 (4700) and R6 (18K) to Pins
> 2/9 of V2,  the schematics say -115 Volts.
>
> You can't go from the same source voltage through 22K to the 6146 and have
> -38V,  and through 22K and then 18K + 4.7K and have -115 volts.
>
> Is the schematics incorrect?
>
>
> Mark K3MSB
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