A Christmas Tale remembered
Mitsubishi PAL Decoder
Converge The RBM A823
Murphy Line Output Transformer Replacement
1977/78 22″ ITT CD662; CVC30-Series
1982 20″ ITT 80-90 Model (unknown)
Retro Tech 2025
Fabulous Finlandia; 1982 Granada C22XZ5
Tales of woe after the storms. (2007)
Live Aerial Mast
Total collapse
What Not To Do
1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
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
A Christmas Tale remembered
Mitsubishi PAL Decoder
Converge The RBM A823
Murphy Line Output Transformer Replacement
1977/78 22″ ITT CD662; CVC30-Series
1982 20″ ITT 80-90 Model (unknown)
Retro Tech 2025
Fabulous Finlandia; 1982 Granada C22XZ5
Tales of woe after the storms. (2007)
Live Aerial Mast
Total collapse
What Not To Do
1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
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
Identification needed
Honest answer is I don't know.
I don't think these are the usual types of devices you'd find in a standard Radio/TV workshop, the only tenuous link is the Rank connection to one device. The bottom unit, Rank Nucleonics, lab device?
The top one as you already suggest is home-brew, look at the god awful components (diodes/resistor?) on long legs! Who would construct like that! Look how they are all leaning over, potentially shorting to one another, I'd not power that up, in that state.
It's a shame @valvebloke does not visit us any longer, I'd lay odds on, he might have a good indication of the bottom device's function, considering his background.
The DC Amplifier is an interesting piece of test gear clearly aimed for laboratory use as it has settings for measuring very low input levels of current (x10^-12 amp) i.e. pico amps, and charge Q (x10^-10) possibly could be 0.1μC.
I suppose this could be regarded as an electrometer characterised by high sensitivity allow it to make voltage, current, and charge measurements which are not available on a standard DMM. For charge measurements the input impedance is extremely high so as not to discharge the source.
Keithley Instruments now owned by Tektronix published a guide to low level measurements that might be a useful introduction.
Rich
Posted by: @marconi_mpt4The DC Amplifier is an interesting piece of test gear clearly aimed for laboratory use as it has settings for measuring very low input levels of current (x10^-12 amp) i.e. pico amps, and charge Q (x10^-10) possibly could be 0.1μC.
I suppose this could be regarded as an electrometer characterised by high sensitivity allow it to make voltage, current, and charge measurements which are not available on a standard DMM. For charge measurements the input impedance is extremely high so as not to discharge the source.
Keithley Instruments now owned by Tektronix published a guide to low level measurements that might be a useful introduction.
Rich
Thanks for that, and you're exactly right.. Someone on facebook said:
"The DC Amplifier was a common thing before digital multimeters and a sort of "replacement" for galvanometers (the really sensitive ones could be very fragile). It allowed you to connect a sensor (a thermocouple, oxygen sensor, geiger tube) that give really low outputs (think along the lines of thousandth of a volt) and 'translate' that to an analogue display that could be read - the dial on the left. The rotary control adjusts the sensitivity of the amplifier - like the range selection on a multimeter. It was also likely calibrated annually by an instrument technician so it's readings were reliable and consistent."
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