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No Jozua, you are late.  I was first!  :boxing:  :baseball:

Not much use I think.  Seems they redesigned that whole circuit between MkII and MkIII.  Also, looks like they don't tell anybody what their JFETs are by looking at that MkII parts list.  Buggers! :baseball:

Voila!  http://www.diyaudio.com/forums/tubes-valves/248474-audio-research-ls5-power-supply-problem.html Thank me later.  There is a schematic and parts list in that fred. EDIT:  Argh dammit.  Version II.  But usually they re-use parts.

OK, so device '1001' are IRF840 MOSFETs, while device '6525' is some sort of JFET.  I will see what I can find out. Why would you want to butcher one LS5 to save another?  That one also FUBARed? EDIT:  If not FUBARed, leave alone.  Desoldering FETs are a bastard.  They can get damaged by...

The Tube Store was more expensive on shipping to SA anyway compared to Tube Depot, although Tube Depot do not have all the valves that The Tube Store has. Last quote I received from Tube Depot was $26 for shipping.  That was for: 4 @ Tung-Sol 6550, 4 @ Tung-Sol KT120 and 2 @ Sovtek 6H30Pi.

Yes, but I can bet you there will be frantic bidding just before the closing time, and by then the price would have at least doubled. Nice TT though, one of my favourites.  But something I will probably never own.  :vsad:

Thank you for the education.  :2thumbs: You would not believe it, but perchance I was reading about the development of the tetrode in Basic Theory and Application of Electron Tubes (US Army..., 1952) just this afternoon while I was waiting for my son doing his cycling at school.  The author...

Ultravox - Monument Dire Straits - Alchemy Talking Heads - Stop Making Sense https://www.youtube.com/watch?v=V4prFmbjZ7M

:envy: Jandre, please give me your physical address.  I am sure I can arrange a 'visit'. :rubhands: Just kidding.  :winkwink:

Thanks Oom Johan Yes, as a youngster I am subject to the opinions of what I read on the net with regards to valves.  And although I will not be able to either find or afford genuine NOS 12AX7/ECC83 valves from Phillips/Siemens/Telefunken/Mullard, I have found a very nice one from Tung-Sol.  I...

I think Balcotan is sort of the same glue as Gorilla glue.  Well, that is what the guy at Apple Tool and Gas told me.  I laminated some long pieces of Pinus Crappus with it, and it is still holding.

If you have the money, try to find a NOS Telefunken ECC83 to replace the 12AX7 with.  But these tubes have been faked on a massive scale.  As with most NOS treasures, be careful.  Here be Dragons. https://tubedepot.com/products/telefunken-ecc83-12ax7-smooth-plate Stay with the established...

If I may hijack this topic whilst we are discussing the EF86 and EF806S pentodes:  what is the benefits that these pentodes provide over a triode input stage?  And is this which made the Mullard design so unique compared to the Williamson design?

Maggies.  On the right hand side of the pic.  Jandre should provide us with another photo of the whole system.

Duncan's Amps also a good site: http://tdsl.duncanamps.com/index.php

http://www.radiomuseum.org/tubes/tube_ef86.html http://www.radiomuseum.org/tubes/tube_ef806s.html

I'll pass.  My budget dictates that I rather buy some KT88s from the Shuguang or Reflektor/New Sensor factories.

Aren't those like super expensive valves?  Prices I see are about $450 each.  Thats about 20K Mandelas worth of valves.

I am going to try the new production Tung-Sol 6550s in my Mars Kit, which has EL34s, so if you want to do some rolling, you could try that.  Then KT88s after that maybe.  Sommer the cheap Shuggy KT88-98s. 6550 and KT88 are Beam Pentodes.

+1.