Kingshill model 15A03c - UK Vintage Radio Repair and Restoration Discussion Forum

FIXITNOW · 11th Oct 2013, 11:03 am

Looking for service info please. Control PCB marked KHD 125-SS issue 1 7/84

Have no output, not too complicated, but circuit would make life easier

0 to 150 volt
0 to 300mA

FIXITNOW · 11th Oct 2013, 12:03 pm

Pictures if they help.

Herald1360 · 11th Oct 2013, 12:34 pm

No idea if this will be any help, but the unit looks similar to yours.

FIXITNOW · 11th Oct 2013, 12:46 pm

Yes, somewhat the same. May help. Pity there is no parts list, but certainly a help.

Cheers.

FIXITNOW · 11th Oct 2013, 2:39 pm

Also found early version of V series without op amp but includes parts list. Between the two should help me more.

FIXITNOW · 25th Oct 2013, 8:01 am

Mine is now fixed using the circuit uploaded by Herald1360
As there was no parts list I have made a part one from my unit
Version 15A03 With PCB marked KHD 125-SS issue 1 7/84

VT3/4/5 BC108
VT8 BCY70 I USED 2N2907A
VT9 BFY51
MR1 1N4005
MR2 BRIDGE OF 4 1N4005
MR3 9V1
MR4 1N823 (6.2V)
MR5 9V1
MR6 3V3
MR7 1N4003
MR10 1N4003
MR9 5V1
MR11 1N4003
MR12 IS MADE OF 3 ZENERS IN SERIES 1 X 43V 1N5367 AND 2 X56V 1N5370 ALL 5W
0A1 OP AMP 741
RV2 50K POT VOLTAGE O/P COURSE
RV3 1K POT VOLTAGE O/P FINE
C4/8/9 10n 250V DC
C11 100n 250V DC
C7 100p 630V DC
C3 4u7 160V
C1 150u 63V I USED 220u
C6 100u 10V
In mine the zeners MR12 had scorched the PCB but measured ok
I replaced all 3 also MR4 /R12 47 ohms /RV3 /VT8 and the 3 electrolytics C1/3/6

11th Oct 2013, 11:03 am	#1
FIXITNOW Octode Join Date: Feb 2007 Location: Ely, Cambridgeshire, UK. Posts: 1,976	Kingshill model 15A03c Looking for service info please. Control PCB marked KHD 125-SS issue 1 7/84 Have no output, not too complicated, but circuit would make life easier 0 to 150 volt 0 to 300mA

11th Oct 2013, 12:03 pm	#2
FIXITNOW Octode Join Date: Feb 2007 Location: Ely, Cambridgeshire, UK. Posts: 1,976	Re: Kingshill model 15A03c Pictures if they help. Attached Thumbnails

11th Oct 2013, 12:46 pm	#4
FIXITNOW Octode Join Date: Feb 2007 Location: Ely, Cambridgeshire, UK. Posts: 1,976	Re: Kingshill model 15A03c Yes, somewhat the same. May help. Pity there is no parts list, but certainly a help. Cheers.

25th Oct 2013, 8:01 am	#6
FIXITNOW Octode Join Date: Feb 2007 Location: Ely, Cambridgeshire, UK. Posts: 1,976	Re: Kingshill model 15A03c Mine is now fixed using the circuit uploaded by Herald1360 As there was no parts list I have made a part one from my unit Version 15A03 With PCB marked KHD 125-SS issue 1 7/84 VT3/4/5 BC108 VT8 BCY70 I USED 2N2907A VT9 BFY51 MR1 1N4005 MR2 BRIDGE OF 4 1N4005 MR3 9V1 MR4 1N823 (6.2V) MR5 9V1 MR6 3V3 MR7 1N4003 MR10 1N4003 MR9 5V1 MR11 1N4003 MR12 IS MADE OF 3 ZENERS IN SERIES 1 X 43V 1N5367 AND 2 X56V 1N5370 ALL 5W 0A1 OP AMP 741 RV2 50K POT VOLTAGE O/P COURSE RV3 1K POT VOLTAGE O/P FINE C4/8/9 10n 250V DC C11 100n 250V DC C7 100p 630V DC C3 4u7 160V C1 150u 63V I USED 220u C6 100u 10V In mine the zeners MR12 had scorched the PCB but measured ok I replaced all 3 also MR4 /R12 47 ohms /RV3 /VT8 and the 3 electrolytics C1/3/6