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The REAL John Linsley Hood Headphone Amplifier
The REAL John Linsley Hood Headphone Amplifier
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Old 7th September 2018, 10:22 PM   #121
Morde is offline Morde  Finland
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The REAL John Linsley Hood Headphone Amplifier
I’ve had some progress with the original version of the JLH headamp. The first channel is almost done, but I noticed a small problem with populating the Q1/Q2. The holes on the pcb are too small for the legs of TO-92 devices. What would be the easiest way to solder them? I was thinking of cutting the legs short and start with one leg and the continue with the others. Maybe it’s not wise to try to drill the holes bigger?
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File Type: jpg 8FC46FCE-8455-46E2-93C6-6750E36F298C.jpg (346.5 KB, 637 views)
File Type: jpeg E2AE14A0-9768-4EAF-AF32-F85C59BA6758.jpeg (784.9 KB, 639 views)
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Headphone amps: SE84, Salas DCG3, UTHAiM, PassDIY HPA, Pioneer Super Linear, XEN JLH
Power amp: M2x

Last edited by Morde; 7th September 2018 at 10:25 PM.
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Old 8th September 2018, 01:23 AM   #122
EUVL is offline EUVL  Europe
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They should be 0.6mm and normally large enough for TO92 ?
Easiest is to drill them larger (to say 0.7mm) but make sure you apply solder on both sides, especially on top.
The solder pads should be large enough and you just need to scrap off some solder resist.


Sorry for that,
Patrick
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Old 8th September 2018, 09:47 AM   #123
EUVL is offline EUVL  Europe
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I rechecked the Gerber files and there was a conversion error.
So those holes were 0.4mm instead of 0.6mm.
The solder pads on the topis 1.5mm diameter in copper, and somewhat smaller in solder resist.
So you should have no problems drilling out to 0.7mm.
If necessary, a little bit of scrapping will certainly give you enough pad all round to solder.

I shall change Gerber and repost once you have built and tested OK.
No effect whatsoever on the XEN version using SOT23 devices.


Thx,
Patrick
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Old 8th September 2018, 11:57 AM   #124
Morde is offline Morde  Finland
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The REAL John Linsley Hood Headphone Amplifier
Ok, Thanks for the info. I’ll see what sizes of drills I have.
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Old 29th November 2018, 12:37 PM   #125
Morde is offline Morde  Finland
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The REAL John Linsley Hood Headphone Amplifier
I have finally done some listening tests with the original version of the JLH headamp circuit. I think it’s quite similar to Xen version of the JLH, but unfortunately I was not able to do direct comparison between them. Instead I compared to Salas DCG-3 with my Sennheiser HD-800 phones. In my opinion the JLH was better in terms of presence and vocals. Also the bass was surprisingly deep and controlled. All in all a very good headamp and easy to listen to.

I had quite bad oscillation problems during the build, but luckily Patrick helped me out with his vast knowledge. Oscillations were tamed by placing a simple JFET buffer before the amp's input (the little green piece of proto board). Also small ceramic caps of 100pF were soldered between base and collector of the output devices. Too bad it required the buffer in front. Would have been nice to listen it directly in a more original form, but I suppose the buffer is quite transparent sonically.

I listened the amp in my newly finished case with the motherboard provided by forum member Algar_emi with Xen regs and all. I attached a couple of pics of the assembly. Still missing some parts for the SHPP protection board.

Next I will test the Xen version of JLH headamp by using this motherboard.
Attached Images
File Type: jpg IMG_2846.jpg (567.5 KB, 518 views)
File Type: jpg IMG_2848.jpg (728.6 KB, 509 views)
File Type: jpg IMG_2850.jpg (824.0 KB, 501 views)
File Type: jpg IMG_2852.jpg (641.3 KB, 208 views)
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Headphone amps: SE84, Salas DCG3, UTHAiM, PassDIY HPA, Pioneer Super Linear, XEN JLH
Power amp: M2x

Last edited by Morde; 29th November 2018 at 12:40 PM. Reason: typo
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Old 29th November 2018, 08:56 PM   #126
blackdod is offline blackdod  Europe
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Nice!
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Old 30th November 2018, 01:01 PM   #127
cumbb is offline cumbb
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Connect the channel-separate-psus;-!!!
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Old 30th November 2018, 01:47 PM   #128
EUVL is offline EUVL  Europe
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No crossfeed ?




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Old 1st December 2018, 11:02 AM   #129
Morde is offline Morde  Finland
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The REAL John Linsley Hood Headphone Amplifier
I really like what the Xen passive crossfeed board does to the soundstage, so I’ll definately put it there on the next phase. This was just to compare these headamps to my existing ones without the xfeed.
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Headphone amps: SE84, Salas DCG3, UTHAiM, PassDIY HPA, Pioneer Super Linear, XEN JLH
Power amp: M2x
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Old 1st December 2018, 03:59 PM   #130
EUVL is offline EUVL  Europe
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> I really like what the Xen passive crossfeed board does to the soundstage,

Every single one who have tried agrees.
All credit to Dimtri Danyuk's original circuit for the inspiration towards the current passive version.


Patrick
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