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Join our unique resource for Olympus Four Thirds E-System DSLR and Pen and OM-D Micro Four Thirds photographers. Show your images via our free e-group photo gallery. Please read the e-group.uk.net forum terms and conditions before posting for the first time. Above all, welcome!


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Foto Fair Post your photos for friendly, non-critical feedback. This is the place to show pictures if you aren't yet ready for full-blooded critique, or simply want to share an interesting picture with other e-group visitors.

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  #1  
Old 22nd September 2018
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This is the BBC Home Service

..On the Wireless.


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Old 22nd September 2018
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Re: This is the BBC Home Service

Nostalgia!
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Old 22nd September 2018
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Re: This is the BBC Home Service

Ah! The sound of EL84s in Push-Pull.
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Old 22nd September 2018
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Re: This is the BBC Home Service

A great shot for those who remember. Were they the good old days?
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Old 22nd September 2018
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Re: This is the BBC Home Service

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Originally Posted by Graham_of_Rainham View Post
Ah! The sound of EL84s in Push-Pull.
Nerd mode... Actually 6v6s in parallel single ended, not push pull.

But I do have an EL84 push pull amp as well
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Old 23rd September 2018
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Re: This is the BBC Home Service

I remember in my youth (several decades ago) in buying an old valve radio from a fete. I also remember the savage bite when touching things that I shouldn't have too. A reminder, don't plug an old power (bakelite) plug into a power point without the cover on, particularly when the power point is on. IT HURTS!

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Old 23rd September 2018
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Re: This is the BBC Home Service

I have managed to avoid that lesson recently. Equally I operate the one hand in the pocket rule
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Old 23rd September 2018
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Re: This is the BBC Home Service

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Originally Posted by OM USer View Post
A great shot for those who remember. Were they the good old days?
Well. We still had an empire, the Americans were our friends, things were actually Made in England, and we were good at football.
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Old 23rd September 2018
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Re: This is the BBC Home Service

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Originally Posted by Ross the fiddler View Post
... I also remember the savage bite when touching things that I shouldn't have too. A reminder, don't plug an old power (bakelite) plug into a power point without the cover on, particularly when the power point is on. IT HURTS!
I do remember touching one of the screws holding the mains wire on the 240V side of a big power transformer. I'm still here and I still remember it taking many seconds before I could pull my hand away. However I can't remember why I had the lid off. The power supply was for a valve amp for a 15 inch speaker in a 3 foot high case.
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Old 24th September 2018
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Re: This is the BBC Home Service

Far more recent but I’ve great memories of using my finger to pull huge fat blue plasma sparks ( struggling for correct term) off the eht cable going to the back of the tube in CRT monitors. Didn’t feel a thing despite this scary looking blue arc.

BTW, referring to the evocative picture that started this, I don’t personally recall valves hanging upside down in any of the kit from my very early days in electronics.
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Old 24th September 2018
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Re: This is the BBC Home Service

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Originally Posted by TimP View Post
Far more recent but Iíve great memories of using my finger to pull huge fat blue plasma sparks ( struggling for correct term) off the eht cable going to the back of the tube in CRT monitors. Didnít feel a thing despite this scary looking blue arc.

BTW, referring to the evocative picture that started this, I donít personally recall valves hanging upside down in any of the kit from my very early days in electronics.
It certainly has feeling if trying to remove that EHT cable though without discharging first. It is a pretty effective large capacitor, holding that high voltage charge for quite some time.
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Old 24th September 2018
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Re: This is the BBC Home Service

Upside down valves are quite common in guitar amps. In fact some valves are produced with inverted printing as a result.

The design of guitar amps revolves around the speaker. We want the largest speaker in the smallest box. So the electronics need to fit the triangular shape behind the speaker at the back of the box. So the valves fit best when pointing down just behind the speaker...

If you are wondering where the tweeter is, and the bass reflex ports and the box damping fibre .. guitarists will say "what?"

So valve hifi and speakers are at the opposite end of design spectrum to guitar gear
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Old 24th September 2018
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Re: This is the BBC Home Service

Many (very!) years ago a GPO engineer at Dollis hill said that they used to get an old piece of valve equipment, take out the valves and holding them under water, file off the tips to allow water to enter. They then used to plug them back in and wait for an unsuspecting person to switch it on. The valve heaters would boil the water and jets of water would spout out of them. (I guess the HT side of the transformer was disconnected!)

I had no reason to doubt his story!

Jim
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Old 24th September 2018
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Re: This is the BBC Home Service

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Originally Posted by Jim Ford View Post
Many (very!) years ago a GPO engineer at Dollis hill said that they used to get an old piece of valve equipment, take out the valves and holding them under water, file off the tips to allow water to enter. They then used to plug them back in and wait for an unsuspecting person to switch it on. The valve heaters would boil the water and jets of water would spout out of them. (I guess the HT side of the transformer was disconnected!)

I had no reason to doubt his story!

Jim
The wicked things some get up to! Of course I would never charge a capacitor (to 240v), carefully bend the leads over & hand (or throw it) to somebody.
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Old 25th September 2018
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Re: This is the BBC Home Service

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Originally Posted by Ross the fiddler View Post
It certainly has feeling if trying to remove that EHT cable though without discharging first. It is a pretty effective large capacitor, holding that high voltage charge for quite some time.
Yes, learnt that the hard way too, although to be fair I knew from day 1 that it needed discharging first. This was done with an insulated screwdriver by inserting it past the rubber flange thing so it touched the inner conductor and then grounding it to a nearby part of the frame securing the CRT tube.
Learning the hard way involved reaching in to a fairly inaccessible eht connection, getting a minor belt but in removing my hand rapidly I managed to cut a huge long cut in th back as I caught it on a projecting chassis screw. That hurt far worse than the actual eht belt!

Iím now wondering about a photo or video opportunity, if only I could find an old CRT monitor..... that blue arc could be quite impressive.....hmmmmm...
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