1963 Bush TV125CU

Introduction

Before I moved over to colour I started on Black & White Television, I collected in excess of 50 sets before finally moving them along to finance my colour TV collection. I have however kept a couple of sets that are special to me, here is one of them.

Dual Standard

Model: Bush TV125CU
The “U” denotes that the UHF tuner is installed

Year: Released August 1963

Cost: Originally cost £83 11s 5d plus purchase tax

System:405 Line 625 line

Valves: V1 PCC89,V2 PCF86,V21 EF85,V22 EF80,V23 EF80,V24 PCF80,V25 EF80,V26 PCF80,V31 PCF80,V32 PCL85,V33 PCF80,V34 PL36,V35 DY86,V36 PY88,V25 EF80,V26B PCF80,V38 PCL82,V41 PC88,V42 PC86,

CRT: CRT AW47-91

General Information:

tv125-1

tv125-1a

tv125-2

Filter cap C346 snipped and mains applied, low and behold the screen lights up.

tv125-3Some cap changes around the line stage

tv125-4

tv125-5

I carried out the recommend TH32 modification as this set had the original configuration. This involved swapping the positions of TH32 (Thermistor ) with R358 , then changing R358 to a 10R-10W. This saves the thermistor as it now only carries heater current. Also cleaned the system switch contacts

tv125-6

tv125-7

tv125-8

The VHF push button tuner was operating very poorly, the buttons felt sluggish and did not lock correctly. The tuner was removed, gunk removed cleaned and oiled. Smooth operation returned.

tv125-9

tv125-10

tv125-11

tv125-12

Vision buzz from speaker overloaded test card with little or no control over contrast, this all turned out to be VR21 (agc delay) and VR22 (Vision limiter) both being set incorrectly.

tv125-13

Over-wind trouble, HT started at 218V then dropped to around 187V accompanied by loss of width (see below) to the raster. The set was left running, the moisture in the winding seemed to boil off as the HT rose back to 218V along with full width raster. The set was soak tested for 8 hours without issue.

tv125-14

Final two shots show the restored set and the two resulting test cards on 405 & 625 lines

405 Line operation

tv125-15

625 Line operation

tv125-16

 

3 thoughts on “1963 Bush TV125CU

  1. A great picture with excellent convergence and perfect grey-scale.
    (As I’m sure L.Lawry-Johns would have said!)

    Another worthwhile and interesting restore.
    This site just gets better and better !!

    0

  2. I liked this chassis, easy to repair and on the whole reliable. They had a few stock faults but I did not have many difficult to repair ones.

    0

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