1967 Philips G25K502

G6 Chassis

Model: Philips G25K502 (G6)

Year:1967

System:405 Line Black & White – 625 Colour

Original List Price : £341. 14s 4d

Valves:
V1301 A63-11X 25″ Shadow-Mask CRT
V2001 PFL200 Luminance Output and Sync Separator
V2002 EF80 Line Sync amplifier
V4001 PCF802 Line reactance and oscillator
V4002 ECC81 Frame oscillator
V4003 PCC85 Frame buffer/Fly-back suppression
V4004 PL508 Frame output
V5001 PL509 Line output
V5002 PY500 Boost diode
V5003 PD500 Shunt stabiliser
V5004 GY501 EHT rectifier
V5005 EY51 Focus diode (EY87 fitted on this set)
V7001 EF183 1st Chroma amplifier
V7002 EF184 2nd Chroma amplifier
V7003 PCC85 Chroma A.G.C. /Colour Killer
V7004 PCC85 Auto White shift/CRT protection
V7005 PCF200 R-Y amplifier clamp
V7006 PCF200 G-Y amplifier clamp
V7007 PCF200 B-Y amplifier clamp
V7008 EF184 Burst amplifier
V7009 PCF802 Reactance/reference oscillator
V7010 PCL86 A.F. amplifier output

Power Consumption: 400W

Semi conductors

Transistors:17

Rectifiers & Diodes: 45

This 1st generation colour television was part of a suite of sets released by Philips in 1967. All for the start of colour transmissions within Great Britain on the 1st of July of that year. For a Hybrid ( Valve & Transistor) set, it has a whopping 21 Valves  which is a huge count normally reserved for all valve black and white 405 sets, power consumption of the G6 is a whopping 400W ! This particular set has a date stamp of 21st December 1967.

ptv502

The G6 Television is designed for reception of both colour and monochrome pictures on 625- lines and monochrome pictures on 405-lines. For reception the PAL de-lux system is employed, using glass delay line in the chrominance channel to give best quality of colour and easier tuning.

The G25K502 cabinet is finished in ‘Canaletto’ walnut veneers with the loudspeaker mounted below the CRT. The two-tone silver and antique silver control panel is fitted to the right of the tube.

Found: Thanks to Mike Burton for donating it to my collection
Photo of the set as it is now, sitting on the workshop bench, just glad I built it strong enough and large enough to take such a mighty beast.

g6-1

g6-2 g6-3g6-5 g6-6 g6-7 g6-8 g6-9 g6-11

Chrominance Panel

g6-a

I.F. Panel

g6-b

 Convergence Panel

g6-4

Time-Base Panel

g6-c

CRT Base Panel

g6-d

Line Output Panel

g6-e

The EHT Generator

g6-10

Fuses and Centering

g6-f

13th October 2014

I’m tempted to just plug it in and see what gives, we shall see.

On another note the cabinet and legs, the original legs seem to have been missing since this set surfaced in the 1990s. However I do seem to have a set supplied with it, they are Philips legs but from another G6 cabinet, that need adapting. This will entail removal of a section of the back of the leg so it sits flush to the cabinet side. Then a simple move of the key lock plate, so it aligns with the cabinet screw head.

leg1 leg2 leg3 leg4

Update 14th October 2014

Although it had not been powered up since 2009/10 I decided to just plug it in and see.

The valves began to glow and after what seemed and absolute age a full raster appeared. Good so far!

Next I connected the test card generator sending a B&W test card to the 625 side. Tuned in, a good black and white card was presented. I then switch the generator to produce a colour card and the colours appeared, quite weak and difficult to photo. The green blocks at the bottom don’t photo well but are much clearer than shown. All in all a pretty good start thus far. Will do the grey scale firstas its looks a bit on the blue side, then take it from there. Also a check of the stabiliser circuit as its dull and watery colours.

fl2 fl1 fl3 fl4

Update – Cabinet Strengthen

The top of the TV cabinet was very loose on one side this has now been glued and clamped. The drawer at bottom housing the convergence board needed work too otherwise it was in imminent danager of loosing its front. The fluted grill had come away from the left and the grill over the speaker cracked and pushed in. I removed the speaker, managed to push the grill out the glued and screwed the front into position. This damaged I believe has occurred over the years due to the legs being missing. The drawer scrapes the ground every time it was used. Hopefully once the legs are adapted this will not be a problem any longer.
I plan to carefully flatten the entire cabinet and refinish just like I did on the Decca CTV22C

cab

 

a1

21 Oct 2014

X2151 ( OA81) AGC amp was O/C.

Line stabilisation was high on both standards which is not good, adjusted line stabilisation for 585V on 625 (R5040), 470V on 405(R5041).

Adjusted Shunt stabilisation (R5053) for 1.2V across the 1K resistor and set the ACC pre-set (R7179), followed by doing a Grey-scale.

I now just need to sort out the convergence and a little bit of frame bounce.

tcf-3

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