Hi!
I have an update on my Comprehensive Oscilloscopes Review, posted in pages 2/3 of this thread:–
https://www.vintage-radio.net/forum/...d.php?t=166060
Dartron D12:–
Would you believe it, a few days after I got the Dartron very generously donated from Trevor in Diss and salvaged the transformer from it to repair my other "Mitte" one, a manual turned up – I have no idea which kind soul uploaded this, but it does indeed cover that model – download it from the bottom of this post!
Advance Bryans:–
Another very low volume British Instrument maker, their DSO1526 is a 20 MHz Digital Storage Oscilloscope designed by Meguro (they will NOT let you have a circuit for anything, if you order an instruction book from them they remove the circuit & service info!), so this one is a drawing–out job!
Marconi TF2201:–
This is an enormous heavy all–valved beast about the size and weight of a Tektronix 545A with two large dial controls in the top R.H. corner, scaled "1, 2 and 5", what these are for I'm not sure! I've tried to find out more about it but so far zilch!
Open University Oscilloscopes:–
Two models were released by the O.U. for their TS282 "Physics & Electronics" Course:–
A) Generatorscope HK/2A – small portable unit in a blue painted finish metal case, fitted with a DG7-32 CRT, designed in the UK by "Opto Electronic Displays Ltd", and subcontracted to Foxall Instruments for manufacture. Very basic single channel model with approx 1 MHz bandwidth, Timebase no faster than 10 μs/div.
Has a very basic function generator and zener–diode stabilized +9V/–9V psu for experiments, etc., and uses two ECC83 long–tailed pair amplifiers for driving the CRT plates, and a dual 4–input FJH131/7413 Schmitt Trigger NAND gate in the trigger circuits.
The wiring in this is an atrocious mess, and all the PCB terminals are marked "X" – if you get one of these that's been got at, you've had it!
B) Generatorscope II:–
This Japanese designed successor model (also badged "Electronics Workcenter E100") featured in the TS282 courses (I can't find the videos any more, has the O.U. had them removed?) is overall, a much more professionally designed and built dual–beam model with automatic alt/chop selection on the timebase speed switch, assembled on two fairly large pluggable PCBs.
I recommend the Generatorscope II Japanese model if any come up rather than the original Foxall HK/2A design!
Both models have only very basic performance, being intended solely for the experimental work in the TS282 course.
I am writing and drawing what I can for these, I have never seen any specifications for these!
I believe one of the TS282 Course Books was actually titled "Design and Development of the HK/2A Generatorscope" – has anybody ever seen a copy?
Safgan DT420:–
This make was mentioned by a reader in "Television" magazine reader in 1984 in connection with repeated multiple problems caused by the insulation of the 6.3V CRT heater winding breaking down, but otherwise I've not come across this one – please enlighten me if anyone knows anything about these!
Chris