[Heathkit] DX-60B HV DC Output

[hwhall at compuserve.com]

Good point. I see from the block diagram that grid block voltage is applied to the 6CL6 grid, so that seems to explain why it's shown as -115v which seemed such a large value.

WayneWB4OGM

-----Original Message-----
From: manualman at juno.com
To: heathkit at mailman.qth.net
Sent: Fri, Jul 23, 2021 4:01 pm
Subject: Re: [Heathkit] DX-60B HV DC Output

I don't have any of the DX-60 schematics in front of me, but the DX-60
series has grid block keying so be aware of that. Check the measuring
conditions defined on the schematic. Switches are in a certain position,
key up or down, etc.

Pete, wa2cwa
www.manualman.com


On Fri, 23 Jul 2021 17:34:32 -0400 Mark K3MSB <mark.k3msb at gmail.com>
writes:
> 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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