Yep, I had one of those, driving my B & O 1200 turntable. ^^^^^
It was a replacement for the notoriously unreliable Armstrong 521.
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Thank you Ian.
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It is very rare , that I am envious of the equipment members of this forum own, but in the case of your Synchro Iâll make an exception.
This was my first set paired with some Wharefdale Super Lintons and Thorens TD125. The start of a very long journey to full 500 system.
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I was tempted to try the kit but decided to make some speakers instead. They were a Richard Allan kit and I made the cabinets in the kitchen. My wife continues to be very understanding and patient.
The Spectra mat was said to be too heavy for the LP12, causing drag. I think that I still have the mat, which I took off my Linn, somewhere.
I sold mine to a friend a few years ago and it is still going strong. Looking at the prices they fetch now he got a bit of a bargain!
Iâm pretty sure that my friend @Endon had the A1 when we were students living together. The A1 had the additional advantage that it ran so hot that you could heat the room and fry eggs on the heat sink/ griddle on the top 
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My late grandfather had exactly the same amp which he used with (I think) a Thorens TT and a pair of LS3/5aâs of some variety. He only listened to classical music but used to entertain my brother and me with a test disc that included a recording of a coin rolling on a table from left to right and back. My first introduction to proper hifi
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Armstrong 625 receiver, circa 1973. A sleek looking design, sounded good too. Years ahead of its time . My dad had one of these, and so did I
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Is it a special garrard stand for the synchro?
Jean Hirraga still in the business apparently. I found his new design in the recent days in Mono and Stereo.
Itâs a revolving Garrard GDT3 Display Turntable.
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Itâs for advertising or effective ?
It used a basic Garrard idler drive to slowly spin the top turntable. It could be used to display items in 360 degrees in shop window displays etcâŚ
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I have to ask, as I canât work it out - which company was (is?) that ?
As @crispyduck correctly states - I did have an A1 and what a lovely amp it was. I sold it on eBay to someone in Australia and although this allowed me purchase Naim equipment, rather regret it.
Very nice 
I had a doubt about that stand, even if I was quite sure it was just for showing it better. But as you said you still own the SynchroâŚ.
How it compares vs the Gyrodeck? The platter has no brass weights but it sits on a platform, the Gyro directly on its feet.
The Spectra mat was a whale. Some of my clientâs swore by it, we being very orthodox Linn dealers, (not really, we did some stuff very much off the reservation), didnât stock it or recommend it.
The weight WAS the biggest issue. And it just didnât look good. That shade of brownâŚ
The weight problem pushed me to tinker with the Dynavector arm. Getting rid of the base plate saved almost 300g, so the LP12 had the chance to bounce okay.