A Sulzer SUL2.5C
From time to time I do a series of searches on Ebay. One of these is for Racal items,
more out of curiosity than anything else these days. The other day, I did my usual
search and was momentarily stunned by what came up under Racal. My search had turned
up a Racal MA.259 5MHz Reference Oscillator/PSU on a ‘Buy-
Note how on the MA.259G, the three BNC outputs are downwards facing as opposed to facing forward on the SUL2.5. There are also slight differences relating to the PSU control panel.The obvious differences is that the PSU and Oscillator control panels are swapped over; but apart from that, the units are more or less electrically identical.
Happy that my purchase actually worked, I set about cleaning it up. I removed the PSU and Oscillator cylinders and began to clean up the chassis. It was only then that I noticed the Serial Number Plate. How I missed this before, I DO NOT KNOW!
The label speaks for itself. What I had bought for only £25.00 plus £9.00 shipping turns out to be not just an early MA.259 as previously suspected, but the first production MA.259 ... Serial Number N1
wasted no time and clicked on ‘Buy’. I would worry about whether it worked or not
later. Due to teething troubles with the courier, it was almost a full week before
it arrived. It was shipped in a very large box and was even wrapped in cling-
I managed to get a copy of the MA.259 manual from Henk, PA8PDP. However, this is
dated 1966 and I suspected that my MA.259 was older than that since the front panel
arrangement in the manual, notably around the Oscillator controls are not the same
as mine. So I concluded that my one was an early one. I then learned from Dan AC6AO/G3NCR
that the MA.259 was actually a modified and re-