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Forum Free Registration Closed
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
Cross-referencing CRT base connections for CRT tester..
Hi all,
I seem to have given myself a bit of headache today..
I'm trying to rig up a B12 CRT base for use with my CRT tester, and all I have to work on is the connection data for Mullard CRTs; A51-570X and MW55-80.
I realise there is a world of difference between these two, but they are all I have to go on, so I'm trying to map out the wiring so that I can "piggy-back" the B12 onto the lead adapter for the colour CRT.
So far I have the following
A51-570X
Pin Electrode
1--------g3
2--------NP ( no pin? )
3--------k (blue gun)
4--------IC ( internally connected? )
5--------NC ( not connected? )
6--------Heater
7--------Heater
8--------k (red gun)
9--------g1
10-------g2
11-------NC
12-------k (green gun)
13-------g1
14-------NP
MW55-80
Pin Electrode
1--------Heater
2--------g
3--------NP
4--------NP
5--------NP
6--------IC
7--------a2
8--------NP
9--------NP
10-------a1
11-------k
12-------Heater
Have I got it right so far?
If so, would I be correct in thinking? That;
A51-570X pins would relate to MW55-80 pins
7----------------------------------1
9----------------------------------2
?????------------------------------10
8----------------------------------11
6----------------------------------12
If so, which pin on the A55-570 base, would map to pin 10 (a1) on the MW55-80 (B12) base?
I'm getting myself awfully mired in what should be a straightforward job, or have I missed something obvious? .. I don't want to wire this up incorrectly, and fry a good CRT whilst trying to test it.
Marion
It doesn't help that some manufacturers treat the electrodes between the cathode and final anode all as grids, whilst others treat anything after the control grid as an anode!
But in your case, pin 10 maps to pin 10, as:
g = g1
a1 = g2
a2 = g3
The other abbreviations are:
NP = No Pin
NC = No Connection, as in DO NOT CONNECT TO THIS PIN.
IC = Internally Connected.
Bush shot themselves in the foot using an "NC" pin for terminating a grid stopper on the DAC90A. Nul points, Chiswick! Some valve data books do actually stress that connections must not be made to a pin marked "NC" as it can occasionally be strapped to an electrode - and that electrode may not be consistent...!
HTH...
Hi Mike,
Thanks for that info.. Marc has also sent me essentially the same data, so all I need to do now is to await the plug from Framer Dave, and the B8H socket from Glowing Anode, then I'm in business.
Cheers,
Marion
You could get an idea of how long an engineer had been in the trade depending on the terminology used. When setting up a colour TV, some older engineers would say 'I'm going to set up the A1's' whilst younger engineers would refer to them as the G2's...
I usually referred to them as A1's which confused newbies as they spent time looking for the instructions for A1 pots. Gradually I started using G2 more but then I tended to to use both terms for the same adjustment...'don't forget to turn off the A1 switches when you adjust the G2's......!
Rich
Hi Rich,
Now that was what I meant about something obvious.. I should ahve known that! having tweaked, purity-fied ( ) converged and greyscaled a fair few colour sets - How did I miss the relationship between A1 and G2?
Marion
Yep, I still call them A1s, and I am also guilty of mixing old and new terms.
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