1972 GEC 2112

Series 2110 Chassis


Year:
1972

System: 625 Line

Original List Price : £268.00

Valves: None

Transistors: 20

TR1 BF362 R.F. Amp
TR2 BF362 R.F. Amp
TR3 BF363 Mixer-Oscillator
TR51 BU10/BU208 Line Output
TR101 BF196 2nd I.F. Amp
TR102 BF197 3rd I.F. Amp
TR151 BF196 1st I.F. Amp
TR201 BC148 Blanking Pulse Amp
TR301 BF336 Blue Output
TR302 BF336 Green Output
TR303 BF336 Red Output
TR401 BF335 Line Driver
TR451 BC147 Field Sync, Clipper Inverter
TR452 BC148 Discharge Switch
TR453 AC188 Field Output Driver
TR454 16335 Field Output
TR455 16334 Field Output
TR501 AC128 Clamp Diode
TR502 Ac128 Clamp Diode
TR701 BC147 H.T. Voltage Control
TR702 BC147 H.T. Delay *

Integrated Circuits: 9

IC101 TAA550 Tuning Voltage Stabiliser
IC102 TCA270Q Vision Detector, AGC Amplifier, AFC Generator, Video Amplifier
IC180 TBA480Q or TBA120SQ Sound Intercarrier/Amplifier Limiter/Detector
IC181 SN76013ND/07 or TBA800 Sound Output
IC201 TBA560Q or TBA560A/CQ Luminance/Chroma Control Combination
IC251 TBA540Q Reference Generator
IC301 TBA990Q or TBA520Q Chroma Demodulator/PAL Switch
IC302 TBA530Q RGB Matrix Preamplifier
IC401 TBA920Q Sync Sepearator/Line Oscillator combination

Diodes: 25

D1 BB105B Tuning Diode … These Next Four Are A Matched Quad
D2 BB105B Tuning Diode
D3 BB105B Tuning Diode
D4 BB105B Tuning Diode
D51 BZX79-C47 40V Overload Protection Zener
D52 EHT Tripler
D53 EHT Tripler
D54 EHT Tripler
D55 EHT Tripler
D56 EHT Tripler
D57 EHT Tripler
D201 BA154 Clipper Diode
D401 BA154 Starting Diode
D451 BA148 Clamp Diode
SCS451 BR101 Field Oscillator
D452 BA148 Flyback Diode
D453 BA154 Clamp Diode
D501 1N4148 Clamp Diode
D601 BY210-800 40V LT Scan Rectifier
D602 BZV15-C12R 12V Voltage Stabiliser
D603 BZV15-C24R 24V Voltage Stabiliser
D604 BA148 Beam Current Limiter
D605 BA148 Shift Voltage Rectifier
D701 17000 Thyristor Switching Diac
D702 BZY88-C7V5 HT Ref Stabilising Diode
D703 BA154 Starting Diode*
D704 BA154 Protection Diode *

*= Later Models

CRT: 22″ A56 120X

General Info:

The C2110, C2111, C2112 and C2118 models were all solid state and equipped to receive stations in either monochrome or colour on Bands IV and V. Colour demodulation is PAL.

For ease of servicing all panels can be unplugged for examination.

GEC 2112

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Condition:

Generally this set is in superb condition inside and out. The cabinet has a few scratches which are to be expected for a forty three year old set, these will be easily polished out. The electronics look mostly untouched, the only obvious change being a re-gunned CRT having been fitted. The tube is a Thorn “New Life” A56 120X.

Before anything else the CRT was put on the B&K 467 tester as this will determine if the set is a viable repair or not. All three guns were low but the Blue was very bad, I raised the heater volts to 8V and left the CRT running like this for about 20 mins. In this time the Red & Green improved greatly but the Blue gun was having none of it remaining in the bad section of the meter. I decided to run a clean and balance on the Blue gun, this removes the crud from the blue cathode giving a new/fresh emissive layer. Thankfully this worked a treat, with the Blue gun emission reading very high. I’m hoping with the set running under normal working conditions, the Red & Green will naturally improve themselves which is often the case.

I fed in Test Card F, tuned in and got a great picture. Slightly skewed raster which will just require the scan coils rotating. I will leave the set on soak test to see what faults arise but so far unlike a lot of the sets I find, this is a promising start albeit a little uneventful.

Note:

I’ve read a feature of GEC sets is the double-sided printed circuit board. I’ve yet to encounter one so this will be my first foray into that minefield. I’m aware that if one does not wish to learn the hard way, great care must be taken when components are removed from the board. Clearing holes of all solder is paramount. Connections are made on the printed side of the circuit board between the upper and lower print, so dry joints also have to be high on the radar.

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GECstand

 

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 GEC Panels

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