The Lemonfool my pic of the day thread

[kiloran]

Photograph of a PCB that was made in the days of being able to repair them at component level when they went wrong:

PCB? Far too hi-tech. Can't beat point-to-point wiring for repairability.
A ham radio receiver I built in the late 60's using....... valves!



--kiloran

[AleisterCrowley]

ooh I like that!
I got my licence in about 1983 (G1***) so it was all transistors, apart from PAs

[kiloran]

ooh I like that!
I got my licence in about 1983 (G1***) so it was all transistors, apart from PAs

Didn't like transistors, you don't get the fear of mucking about with 300v dc

--kiloran (GM4BRM but inactive for too many years)

[AleisterCrowley]

I like being able to build stuff that'll run off a 9V battery (or a nice friendly 13.8V power supply)
Sadly, I've not got my soldering iron out for many a year (other than to repair stuff), due to moving around for work.
When I finally get my own place I'm going to set up a proper radio shack again - voice modes only, I'm not a fan of the 'radio bits as computer peripherals' trend

[mart44]

The first television I ever worked on in the early 1960's was a Sobell 192 (type: sobell 192 television into a search for images). Not a transistor or PCB in sight. Mains droppers, bias capacitors + resistors on cathodes, Anode load resistors screen grid and grid leak resistors. Turret tuners. Valve types such as: EY 86, PCC 89. PCF 86, PY 81, PL 81, EF 80. Lots of components that could be tracked down and changed if they caused a fault.

The most I ever built was a guitar amplifier. It had 2 x EL 84 in a push-pull arrangement. With a Fablon covered case, it looked quite smart and I managed to sell it for £20.

[jfgw]

Another PCB,



The whole board is here,

Does anyone know what it was for? Those square silver components have 12 pins, 4 x 4 with pins on the perimeter only.

Julian F. G. W.

[AleisterCrowley]

Doesn't look familiar - bit of ancient computer, or exchange/switch card?
Possibly 1960s

[mart44]

That PCB is nothing I recognise. On another subject, here's a bit of handmade jewellery. Lots of beads all put together by my wife:

[gryffron]

Does anyone know what it was for? Those square silver components have 12 pins, 4 x 4 with pins on the perimeter only.

Ooh! I like a challenge.

Well the square things are three transistors or logic gates in a package. The first steps in computer integration.
Explanation here: https://en.m.wikipedia.org/wiki/IBM_Sol ... Technology
In fact, your card looks suspiciously like one of those in the card frame shown on that page. Part of the processor of an IBM 360? A microprocessor without the micro!

Gryff

[AleisterCrowley]

I think you got it ! [Sadly no 'like' button now.] edit: 'like is back...
I could tell it wasn't military (no NSNs in sight) and was probably from a large equip manufacturer using their own custom part numbers

[jfgw]

Well the square things are three transistors or logic gates in a package. The first steps in computer integration.
Explanation here: https://en.m.wikipedia.org/wiki/IBM_Sol ... Technology
In fact, your card looks suspiciously like one of those in the card frame shown on that page. Part of the processor of an IBM 360? A microprocessor without the micro!
Gryff

Thanks Gryff - a standard format card used by IBM for almost everything of that age. It is interesting to know what the metal cans are.

Apart from the resistors and the two yellow/red capacitors, there is very little informative marking or writing on the other components. Most have a seven-digit code and have numbered pins but no values. The cans, as well as having numbers, are marked "IBM WF" except for one marked "IBM-YV".

I think you got it ! [Sadly no 'like' button now.] edit: 'like is back...
I could tell it wasn't military (no NSNs in sight) and was probably from a large equip manufacturer using their own custom part numbers

Also, it doesn't look robust enough to be military, and there is no thick conformal coating.

Julian F. G. W.

[AleisterCrowley]

Conformal coating is used selectively , as it makes fault finding/repair a pig! I've got a fair bit of CLANSMAN era radio stuff which is nicely built but not encapsulated. The older stuff was occasionally 'tropicalised' - which seemed to involve dipping in varnish....

[gryffron]

I started by googling the part numbers. And found this: http://ibm-slt-reference.wikia.com/wiki/SLT_Board_List
Which lists all those encapsulated parts. The "chips" have a selection of different logic gates. Early 74LS logic. Though they're not actually silicon chips. They're tiny discrete transistors glued onto a ceramic "chip".

Gryff

[jfgw]

I started by googling the part numbers. And found this: http://ibm-slt-reference.wikia.com/wiki/SLT_Board_List
Which lists all those encapsulated parts. The "chips" have a selection of different logic gates. Early 74LS logic. Though they're not actually silicon chips. They're tiny discrete transistors glued onto a ceramic "chip".

Gryff

The module list is here, http://ibm-slt-reference.wikia.com/wiki/SLT_Module_List . So I have some logic gates, some diodes and some transistors.

Julian F. G. W.

[mart44]

Restoration of a photograph taken in WW1. It took some doing since bits of it were completely missing but got there in the end:

[kiloran]

[quote="mart44"]Restoration of a photograph taken in WW1. It took some doing since bits of it were completely missing but got there in the end:

"It took some doing" sounds a bit of an understatement. That's impressive! I can muddle along to eliminate specks of dust from scanned 35mm slides, but I wouldn't know where to start with your task.

Out of interest, what software did you use?

--kiloran

[mart44]

Hello kiloran - Thanks Corel Photo-Paint was used for the restoration (part of the CorelDraw Suite).

[mart44]

An old photograph restored and with colour added:

[kiloran]

Hello kiloran - Thanks Corel Photo-Paint was used for the restoration (part of the CorelDraw Suite).

£500!!!??? Ouch!
Does it keep your beer topped up and provide winsome lasses to massage you? That's the minimum I'd expect for that price.

--(cheapskate) kiloran

[mart44]

£500!!!??? Ouch!
Does it keep your beer topped up and provide winsome lasses to massage you? That's the minimum I'd expect for that price.

--(cheapskate) kiloran

I think I had version 8 when that photo was done. The current version I have is X7 Home & Student. Photo-Paint in this is still functional enough to do restorations but is much more affordable. Around £70 on Amazon.