Mystery timebase unit.

[FERNSEH]

Found this very small television timebase chassis which was removed from some unfortunate late forties TV set.
The valves were all made by Mazda.
6P28 line output. SP61 line oscillator, possibly a Miller integrator type.
6P25 frame output. SP61 frame oscillator, also a Miller type?
The sync separator was an SP61.
Two Mazda D1 diodes. One functioned in an interlace circuit.
The line output transformer had been removed a long time long ago but there is evidence that it was a round can type.
It's possible that the video output stage was present on this unit and maybe the sound output also.
It had an Ultra look about it but I don't think it was removed from a V470.

Any ideas?

DFWB.

[line sync]

It looks home made david ?

Robin

[FERNSEH]

Hi Robin,
I reckon it is. The RF unit was in very bad condition, not worth saving as a complete unit but it was some use as a source of B8A valveholders.

DFWB.

[Heatercathodeshort]

Do you have the control knobs for it David? J.

[FERNSEH]

Hi John,
No control knobs but I still have the local oscillator coil.

DFWB.

[Heatercathodeshort]

Heavens be praised. J.

[FERNSEH]

And here it is.

DFWB.

[Heatercathodeshort]

This is very odd. Don't you think it strange that of all the components that go together to make a television receiver, just the local oscillator coil has survived from that naked chassis..
I have a feeling in my bones we are going to have a pitiful trail of detritus traipsed out over a period that is claimed to belong to that horrid chassis that appears to have been made from an old creosote can. It may have been an experimental chassis discarded by the old Masteradio Company.
They may have stripped it down to use the bits for that Nastyradio that you have tucked away somewhere safely out of my destructive grasp. John.

[Radio Wrangler]

Is that a postage stamp mica trimmer used as the LO tuning control behind it?

DAvid

[yesnaby]

Take it to the council recycling then someone from 'Money For Nothing' on BBC1 may find it and restore it for you! They have a technician there called 'Horse' who can fix or adapt anything ....

[Oliver35]

H'm, quite. Was it him I saw preparing to operate on a Murphy set? I didn't get to see the outcome..

[FERNSEH]

Originally Posted by Heatercathodeshort

This is very odd. It may have been an experimental chassis discarded by the old Masteradio Company.
They may have stripped it down to use the bits for that Nastyradio that you have tucked away somewhere safely out of my destructive grasp. John.

Hi John,
It's four years now since I collected the fabulous Masteradio from an address in Clitheroe, Lancs.
Hi Dave, yes, it's a postage stamp type of trimmer. I've found the remains of the RF unit. Can't do much with it. However, there's no need to call for the services of Horse because I've got plans for the timebase chassis. I'm going to rebuild it. I reckon a the speed I get things done the rebuilt chassis will be complete by the year 2025!

DFWB.

[Heatercathodeshort]

I feel there is a hidden agenda here David. I think your 'Mystery Timebase chassis' was the original guts from that pink horror. You built a new chassis for that Nastradio didn't you? Come on, own up! John.

[FERNSEH]

Hi John,
No new chassis in the Masteradio. However, not long after the picture was taken I decided switch it on. Everything was fine until the picture and sound disappeared and clouds of smoke came out of the cabinet. A serious burnt out has taken place somewhere in the set. Look out for a new topic about the Masteradio T852.

DFWB.

[peter_scott]

Hmm!

Now that your T23 is nicely lit up again it would be lovely to see what it was really capable of back in 1937. Would it show 3MHz bars if correctly aligned?
How did it compare in performance with the EMI sets of the period.

Peter

[FERNSEH]

Hi Peter,
the T23 displays the 2Mc's bars fine but it struggles with the 2.5.
As for performance and build quality of Baird versus EMI TV sets, why not introduce a debate about this?

DFWB.

[Heatercathodeshort]

I was right about that Messyradio chassis David. I found this picture in an old copy of 'Making a Television Receiver from Old Scrap' 1949 by Irony Trap. It does look a lot like yours. The valve line up is odd. John.