Identifying unknown items

[paulsherwin]

Thread reopened by request.

[Julesomega]

This switch looks as though it could be from some telephony equipment, though I can't think where it would be mounted...?

[DrStrangelove]

Originally Posted by Julesomega

Okay I know what this is - it's marked on it: "Farnell FT1 Sound Sync Indicator" - but what's it supposed to do?

It runs off a PP9, has a 6-pin DIN plug on a flying lead, and phono sockets on the front marked "VAR IN" and "REF IN". What sort of Various Variable might this be? There's a big knob for some sort of amplitude, and on the rear it can be switched to 1 or 2

It appears never to have been opened, not even for fitting a battery; no doubt someone thought it was worth ordering one but when they hit the ON switch nothing happened so it went back into stores. How do you usually synchronise sound and vision?

No idea what it does but there's a brief reference to it and the FT2 and FT3 in the June 1974 Studio Sound.

https://worldradiohistory.com/Archiv...nd-1974-06.pdf

Appears to be some sort of thingie for syncing a sound recorder to a camera?

It's a mystery wrapped in an enigma.

[Julesomega]

Originally Posted by DrStrangelove

No idea what it does but there's a brief reference to it and the FT2 and FT3 in the June 1974 Studio Sound.

Thanks for the link, where I see there is a whole article about Tape and Film Synchronisers on page 48. Interesting to note that it was some kind of joint venture with Tandberg

[Cobaltblue]

Originally Posted by Julesomega

This switch looks as though it could be from some telephony equipment, though I can't think where it would be mounted...?

Looks like the switch we used to have in the office that turned off the outside Telephone Bell and turned on the Ansaphone back in the 70's and 80's.

During office hours there were always at least 4 or 5 in the office or the yard.

All the regional offices had a similar arrangement. In the case of the Avonmouth office the switch was in the corner of the window sill adjacent to the fault controllers desk.

Cheers

Mike T

[Julesomega]

This is a mount for the familiar Colvern 1½" WW pot (in this case 500R), and has a screw clamp for the skirt of the knob, though the screw is self-tapping into the Bakelite mount, so cannot have been intended for frequent use. Two of the four mounting holes have spire clips for the self-tapping screws.

A printed sticker on the side is marked 76500 T while the designation 402669-A is moulded on the rear

Anyone recognise this?

[Julesomega]

Two bare PCBs which seem to make a pair, marked "FOC"
Seems to take 2 terminal pins/wires and a few components, maybe a speaker crossover network?

[Silicon]

Circuit board B seems to have positions for two transistors.

Could it be a buffer circuit?

[Julesomega]

Ah yes, and it's got a '+' terminal

[Herald1360]

Looks more like FCR than FOC!

[Julesomega]

Originally Posted by Herald1360

Looks more like FCR than FOC!

Ah, yes, think I was going to offer them FOC

[Jez1234]

Originally Posted by Julesomega

Thanks for the link, where I see there is a whole article about Tape and Film Synchronisers on page 48. Interesting to note that it was some kind of joint venture with Tandberg

IIRC Farnell was once UK distributor for Tandberg.

[DrStrangelove]

Originally Posted by Jez1234

IIRC Farnell was once UK distributor for Tandberg.

Indeed they were: that's where I got pinch rollers & drive belt for a TCD300 from.

[Julesomega]

Does anyone recognise this slow motion dial? The face is decorated with panelled fields of star patterns and is meant to screw to a fascia. It takes a ¼" round shaft. Both sides of the anodised circular dial are marked 0 to 100 and can be seen through three windows, the top one having perspex 'glazing'.

The outstanding feature is that the slow-motion knob can be tilted upwards to disconnect it from the dial plate allowing direct turning, and then re-engaged without shifting the new position.

[Julesomega]

Here's a twin gang pot ganged also with a variable capacitor. The pot at the knob end is very approximately 6k Ohms logarithmic. Behind that is very approximately 9k Ohms linear. At the rear is variable capacitor with thin paxolin as the dielectric, covering 25pF - 560pF with all the variation taking place within a rotation of about 60 degrees. There are no manufacturer idents or other markings.

What could it be? I can only think of combined Volume, Gain, and Feedback for a TRF.

[Ed_Dinning]

Hi Jules, yes I saw a single pot and cap version of those many years ago on an early 30's set as a vol/gain control.
Can't remember which set though

Ed

[Julesomega]

Small PCB found in a box of stuff, no idea where it came from, but it has had the 2nd most valuable pair of components removed. The 1st most valuable is a pair of TA7358AP "FM Front End" ASICs but these are still in position. What were removed appear to be ceramic resonators serving as the LO for some frequency conversion process.
Although intended for FM Broadcast receivers in the range 83 - 108MHz there are no bandpass functions in the IC and they could be used down to audio, and at first I thought the board might be an audio device, but tracing out the circuit finds several tuned circuits using EPCOS RFCs. Simple calculation of resonant frequencies looks like the external I-P is around 1.7MHz and the O-P is around 10.7MHz, from which I conclude that the missing resonators were 9MHz.
Was the TA7358AP used in CB SSB rigs? What else could possibly require up-conversion from 1.7 - 10.7MHz?

[ScottBouch]

Originally Posted by beamcurrent

I think those 2 pin connectors were used on WW2 vintage flying helmets for the microphone and/or headsets. As an in line connector that just pulled apart.

Nope, they look very similar but the microphone connectors have a third connection for screen/shielding.

Cheers, Scott.

[ScottBouch]

Originally Posted by Julesomega

Can someone identify these polarised 2-pole connectors? They are all marked CLANG, the male ones usually show an AM logo and REF. No. 5c/455, the female REF. No. 5C/2118

It would help me to know if they fit some equipment in my collection!

These I have seen used in aircraft as test sockets, I think I recall one specifically in the EE Lightning associated with the re-heat/afterburner system.

Cheers, Scott