gidders
hifi enthusiast, golfer & photographer
A couple of months ago I was speaking with John Jackson aka JJ about improving the amplification of my system without swapping my 2 x 250s for 4 x 135s - I didn't want to increase the box count. My 250s have already been upgraded with the addition of Avondale HCR200 power regulators & John's Phoenix amplifier boards, sound amazing & outperform standard 135s so I appreciated it might be a tall order... but read on.
For those of you who don't know him, JJ is ex Naim Senior Test & Service Engineer & was Witch Hat Lead R&D Engineer before their demise. He is now operating under his own name as JJSThatcham (https://www.jjsthatcham.uk/) offering Naim servicing & upgrades. When I put my question to him, he told me that there was a modification that's he'd been thinking about for a while but not got round to trying - did I want to be a guinea pig?
The modification involved taking a pair of his highly acclaimed Dragon Newts (which will elevate the performance of your Hicap or Supercap) tweaking them to produce +/-42 volts rather than +24 and using them to power a specific section of the Phoenix boards, which would benefit from these ultra-low noise power regulators.
So I took a deep breath, put my system back to passive & handed one of my amps over. The development had to overcome a couple of hurdles. The first build of the 42 volt Newts wasn't a quiet as John wanted, but a redesign solved that. Secondly a variation to ensure PSUs start up safely in all conditions caused another issue but that was soon resolved. And about ten days ago John called me to say my amp was ready for collection.
Those of you that don't know my system may be thinking that, when I mention Aktiv & 250s in the same breath, there'd be something like a 52/supercap/snaxo/ in front of the power amps, and in fact there used to be. But the clue is in "Aktiv" rather than active. Now at the front of my system is a Linn Klimax System Hub which is a streamer/pre amp followed by a Klimax Exaktbox Organic which performs DAC & digital crossover filter duties. I found that the Linn Aktiv implementation is a significant improvement over the Naim snaxo. My speakers are now Kudos 707s although until recently I had SL2s with bespoke crossover filters created by Neil Hallworth / http://speakerfilters.blogspot.com/
So how does it sound? I've initially left my system passive so I can easily compare to the existing amp. Straight out of the box it was obvious that the addition of the Dragon Newts had made improvements but now they've got 200 hours /10 days under their belt so I sat down do a serious comparison. I pulled up my Test Tracks playlist (link at the end) & chose five tracks. First up was Mary Coughlan - The Beach. It was immediately apparent from the open opening notes that the sax intro has more detail, more of a rasp to it. When Mary starts singing, the vocal has more air & is more breathy. The guitars are more distinct & more defined. Notes start & stop with more precision. But the overall impression is of a more musical, more real, more live performance.
Other tracks I listened too were Hanne Boel - After Midnight, ERA - The Mass, John Campbell - Way Down in the Hole & Nils Lofgren - Little On Up (you thought I was going to say Keith Don't Go didn't you). It was the same story. Snare drums have more snap, bass lines are tighter, there's more air round instruments, there's more vocal inflection & everything is easier to follow. On the ERA track the timpanis sound more - well more like timpanis & the track has more drive. The Nils Lofgren track while it's easier to separate the two guitars, the whole track is more poignant, you can feel the emotion.
To summarize, the modification retains all the PRaT that Naim amps are famed for and gives you more of the attributes you'd want - tighter bass lines, more precision, more decay on sustained notes, more shimmer & shine on symbols, airiness & separation, greater insight into vocals & individual instruments. However it manages to do this in a hugely musical & real, non HiFi sort of way. It sounds more like a live performance, be that in a controlled studio environment, on a stage or in your local pub. It sounds like the musicians are having just so much fun. Fantastic. Swapping back to the original amp (very briefly) & that sounded a bit dull & pedestrian by comparison, & bear in mind that this is an amp that out performs standard 135s.
I'm now itching to have Dragon Newts fitted to my other amp so I can go back to Aktiv. One point to bear in mind, that this is not a DIY installation because there needs to be some modification to the Phoenix boards & to the wiring loom. But if you've got Phoenix boards in your amp(s) I can't recommend this upgrade highly enough - talk to John about it. If you've not got Phoenix boards - even more reason to give him a call.
If you'd like to come & have a listen - PM me (I live in Birmingham, West Midlands)
Footnotes
1. Test Tracks
https://open.qobuz.com/playlist/7693858
https://tidal.com/browse/playlist/5822bbac-97fc-4471-83bf-d6e284571a13
2. During the week John had messaged me to say that he was so impressed with what the Dragon Newts had added to my amp, that he was installing them in his amps.
3. I was doing my yoga workout this morning, feeding my laptop output into my system. The instructors are filmed in a disused warehouse & it was the first time I'd heard that slightly echoey acoustic you get in those buildings.
For those of you who don't know him, JJ is ex Naim Senior Test & Service Engineer & was Witch Hat Lead R&D Engineer before their demise. He is now operating under his own name as JJSThatcham (https://www.jjsthatcham.uk/) offering Naim servicing & upgrades. When I put my question to him, he told me that there was a modification that's he'd been thinking about for a while but not got round to trying - did I want to be a guinea pig?
The modification involved taking a pair of his highly acclaimed Dragon Newts (which will elevate the performance of your Hicap or Supercap) tweaking them to produce +/-42 volts rather than +24 and using them to power a specific section of the Phoenix boards, which would benefit from these ultra-low noise power regulators.
So I took a deep breath, put my system back to passive & handed one of my amps over. The development had to overcome a couple of hurdles. The first build of the 42 volt Newts wasn't a quiet as John wanted, but a redesign solved that. Secondly a variation to ensure PSUs start up safely in all conditions caused another issue but that was soon resolved. And about ten days ago John called me to say my amp was ready for collection.
Those of you that don't know my system may be thinking that, when I mention Aktiv & 250s in the same breath, there'd be something like a 52/supercap/snaxo/ in front of the power amps, and in fact there used to be. But the clue is in "Aktiv" rather than active. Now at the front of my system is a Linn Klimax System Hub which is a streamer/pre amp followed by a Klimax Exaktbox Organic which performs DAC & digital crossover filter duties. I found that the Linn Aktiv implementation is a significant improvement over the Naim snaxo. My speakers are now Kudos 707s although until recently I had SL2s with bespoke crossover filters created by Neil Hallworth / http://speakerfilters.blogspot.com/
So how does it sound? I've initially left my system passive so I can easily compare to the existing amp. Straight out of the box it was obvious that the addition of the Dragon Newts had made improvements but now they've got 200 hours /10 days under their belt so I sat down do a serious comparison. I pulled up my Test Tracks playlist (link at the end) & chose five tracks. First up was Mary Coughlan - The Beach. It was immediately apparent from the open opening notes that the sax intro has more detail, more of a rasp to it. When Mary starts singing, the vocal has more air & is more breathy. The guitars are more distinct & more defined. Notes start & stop with more precision. But the overall impression is of a more musical, more real, more live performance.
Other tracks I listened too were Hanne Boel - After Midnight, ERA - The Mass, John Campbell - Way Down in the Hole & Nils Lofgren - Little On Up (you thought I was going to say Keith Don't Go didn't you). It was the same story. Snare drums have more snap, bass lines are tighter, there's more air round instruments, there's more vocal inflection & everything is easier to follow. On the ERA track the timpanis sound more - well more like timpanis & the track has more drive. The Nils Lofgren track while it's easier to separate the two guitars, the whole track is more poignant, you can feel the emotion.
To summarize, the modification retains all the PRaT that Naim amps are famed for and gives you more of the attributes you'd want - tighter bass lines, more precision, more decay on sustained notes, more shimmer & shine on symbols, airiness & separation, greater insight into vocals & individual instruments. However it manages to do this in a hugely musical & real, non HiFi sort of way. It sounds more like a live performance, be that in a controlled studio environment, on a stage or in your local pub. It sounds like the musicians are having just so much fun. Fantastic. Swapping back to the original amp (very briefly) & that sounded a bit dull & pedestrian by comparison, & bear in mind that this is an amp that out performs standard 135s.
I'm now itching to have Dragon Newts fitted to my other amp so I can go back to Aktiv. One point to bear in mind, that this is not a DIY installation because there needs to be some modification to the Phoenix boards & to the wiring loom. But if you've got Phoenix boards in your amp(s) I can't recommend this upgrade highly enough - talk to John about it. If you've not got Phoenix boards - even more reason to give him a call.
If you'd like to come & have a listen - PM me (I live in Birmingham, West Midlands)
Footnotes
1. Test Tracks
https://open.qobuz.com/playlist/7693858
https://tidal.com/browse/playlist/5822bbac-97fc-4471-83bf-d6e284571a13
2. During the week John had messaged me to say that he was so impressed with what the Dragon Newts had added to my amp, that he was installing them in his amps.
3. I was doing my yoga workout this morning, feeding my laptop output into my system. The instructors are filmed in a disused warehouse & it was the first time I'd heard that slightly echoey acoustic you get in those buildings.
