How PA used to be

[boatman]

Some fascinating PA history here. It's a pity these amps weren't used for the 1964 NME poll winners concert in Wembley Pool Arena, we might have heard something!

[dbuckley]

Wow.

 

Schematic and service manual (not in English) here (PDF, 1MB).

 

Heres a great image of it:

 

http://historische-elektronik.piranho.de/Hyperlink%20F/EL6471%201kW%20Groszverstaerker-Dateien/image031.jpg

 

I love it uses mercury vapour rectifiers.

 

Heres a mercury arc sparked up a little while back:

 

http://davidbuckley.name/pix/mercarc.jpg

[themadhippy]

must resist temptation to even look at schematic

[Jivemaster]

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name="allowFullScreen" value="true"></param><param name="allowScriptAccess" value="always"></param><embed src="

type="application/x-shockwave-flash" allowfullscreen="true" allowScriptAccess="always" width="640" height="390"></embed></object>

 

<object width="640" height="390"><param name="movie" value="

name="allowFullScreen" value="true"></param><param name="allowScriptAccess" value="always"></param><embed src="

type="application/x-shockwave-flash" allowfullscreen="true" allowScriptAccess="always" width="640" height="390"></embed></object>

 

 

Would anyone care to turn on a 3200VDC HT rail after a load in in the rain????

[cedd]

Thank you Jivemaster!!! I've been looking for that first video for ages!

 

Some industries still use valves all the time, or at least the same technology.... they're still one of the best ways to get tonnes of gain from one stage. 50dB's in one go from a travelling wave tube.

[daifuse]

Glorious!