Pinball Machine
Dating back to the 70s. Mechanical faults, processor board interconnection problems, power supply and EPROMs having lost their memory. A big struggle to get working correctly. At least we had fun in ...
Seth´s Articles
An interesting project
Here is an interesting project. A client asked me if I could make a power supply for a coil. Okay was the reply, but I wanted more information obviously. After a couple of hours conversation and ...
A local radio station transmitter
A local radio station reported that their transmitter was suffering with low output, with alarm lights on, indicating a bad SWR reading. This is normally where the antenna is badly matched to the ...
Not my favorite things to work on!
Well, not my favorite things to work on, but the word has got around. A selection of organs that have come in recently. Some very hard to fault find. There have been a couple of 1970s organs. Mainly ...
A few radios recently restored
The local vintage car club is good fun. A few radios recently restored. The most interesting one was a 6 Volt American Bosch round unit. Built like a domestic radio, using 6 volt heater valves. This ...
Happy Christmas!
https://www.youtube.com/watch?v=7cC3Ymd9P8U
85 years of TV – Now in Colour! An update
Celebrating 85 years of TV – Now in Colour!Well, it is 85 years since the first official TV broadcasts were made from Alexandra Palace. The East Wing of Ali Palais had been converted into studios, ...
Hedley Jones….. Know about him?
A little off piste this one. As you know, I like writing about engineers and personalities that, in my opinion never received the recognition that they deserved. This chap did, sort of receive ...
Bill Tutte – Bletchley park
Thos e of you who read my articles regularly, will appreciate that I have a passion for vintage electronics, engineers who have stamped their mark on our lives and who have gone somewhat unsung. I ...
Leak Point One, TL12…. Et al
Well, you can't say a bad thing about any one from the Leak family (no, I am not talking about the Leak 30s and 70 please). What to watch out for; Have a look at the mains transformer for signs ...
TV Sets
With the growth of budget priced colour TVs during the 70s and 80s, black and white sets slowly started to become a thing of the past. However, with a generation or two on and 40+ year olds hankering ...
Audio Research
I have had a couple of D115s recently.These are lovely amplifiers, but not designed to be serviced. Nine 6550s / KT88s and loads of drivers, phase splitters, long tailed pairs, ICs, transistors ...
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