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Old 30th December 2012, 01:51 PM   #351
Zen Mod is offline Zen Mod  Serbia
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your build is treat for eyes

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Old 30th December 2012, 02:20 PM   #352
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Thanks Zen Mod. It keeps the room warm as well!!
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Old 30th December 2012, 02:51 PM   #353
kenev is offline kenev  Greece
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Hi Dean,

Great job! Really, a piece of art!

Now, just drop a few comments on the sound...
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Old 30th December 2012, 04:04 PM   #354
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I'm having issues with the phono stage at the moment so can only comment on the line stage. (the more eagle eyed viewers will have noticed the phono boards are not connected to the selector switch) Well, what can I say? I was using Stevens and Billington TVC passive into JELabs 300b monoblocks before this and this beats the TVC hands down. Sound impressions are just so personal though so I wont go on and on about "spaciousness" and "dark backgrounds" blah, blah, blah!

I've been constructing this on and off for twelve years (I like a challenge) so I would say it sounds fantastic wouldn't I? Honestly though, my personal feeling is that it has fantastic potential which my other equipment currently doesn't fully exploit. My new project is to feed it from PC based music server through a dual mono balanced Sabre DAC and to get the pesky phono stage working. I'm only getting 20db gain on the phono with sk170's despite playing with the gain resistors. I'm going to try substituting those with SSM2212RZ before I investigate further.

Here's a few more piccys to whet your appetite. Everything built on 4mm PTFE in a copper chassis. Silver wire and silver foil except for power which uses multistrand PTFE silver coated copper. If I was building this again I would use rails to fasten everything to, as others have done, and make everything accessible from below. It's a PITA to do any tweaking as it is.

Initially I had a problem with noise but only because I had the line gain too low. I upped that and tweaked the input to my power amps which solved the problem.

I suppose that if you're on this forum then you know the potential of this amp. If you've not built one then give it a go as it's worth the effort just for the line stage! Some day I might get the phono working as well.
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Old 30th December 2012, 04:44 PM   #355
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WOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!

What a beauty!
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Old 30th December 2012, 04:46 PM   #356
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One of the best builts in honour of Allen Wright...
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Old 30th December 2012, 06:18 PM   #357
Alex M is offline Alex M  United Kingdom
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Very nice.

I'm intrigued by your gain problem with the phono stage. As a quick check, you could connect a pair of reasonably well-matched BC550s to see if the solid-state devices are the cause. This design is optimised for bipolar input transistors, rather than JFETs.

Have you measured the DC voltages on the anodes and cathodes of the valves? Is the standing current correct?

Alex
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Old 30th December 2012, 06:40 PM   #358
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My line & RIAA module for one channel of the RTP3D (2008 instructions):

Click the image to open in full size.

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Old 30th December 2012, 06:51 PM   #359
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Very nice! But how did you get the stuff fixed in the slut during soldeing???
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Old 30th December 2012, 06:53 PM   #360
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Quote:
Originally Posted by HVfanatic View Post
Very nice! But how did you get the stuff fixed in the slut during soldeing???
It stay fixed all by itself...

Click the image to open in full size.
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