dicky
quite active
Posts: 230
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Post by dicky on Apr 8, 2013 12:29:41 GMT
Great, thanks Dicky, duly ordered. Maybe my new shoes will even fit me now Syd Syd, I should mention that when you apply this to the driver (or anywhere where you want to be able to hear anything) you need to remove the adhesive layer (I'm sure you know this anyway). The best way I found to do this was to cut through the adhesive with a scalpel all around the shape you want to remove and then scrape a corner with the blade until it forms a blob of glue. Then, if you've scored it well enough, you can grip the 'blob' and gently pull the adhesive off in one piece - a bit like skinning a fish. When you do this, it takes a nice even layer of felt. You need to keep it taught while you do it. It worked first time for me - I was pleasantly surprised.
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juke
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Post by juke on Apr 8, 2013 13:08:00 GMT
Hi Dicky Yes I understand, but thanks anyway, I quite often miss the obvious I already had the job half done but the felt I used was 7 or 8mm, intended for the bases of table lamps etc, sliced down a little with a scalpel. It's very stiff so I didn't do both sides of the drivers, I was holding off until I could locate the right stuff. So I was glad to see your link Syd
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Deleted
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Post by Deleted on Apr 8, 2013 13:26:25 GMT
If I had the choice between the T20/40/50, and was fully up for modding, which one is the best to go for??
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solderdude
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Post by solderdude on Apr 8, 2013 13:50:57 GMT
T50, I have a sneaky feeling Foster selects the best matching drivers for the T50. The production costs for these headphones are relatively the same. The T20 has 1 small piece of plastic less in it compared to the T40. The T50 has the piece of plastic replaced by a piece of acoustic paper and a different color (copperish) cup holder. The difference in price between T50 and the others is hard to justify with only the copperish metal rods as a difference so suspect they put a bit more (matching ?) efforts in their TOTR
The T40's I modded both had some differences between L and R driver. Fortunately they were similarly off so could easily make 2 closer matched T40's
The T50 I had (older black drivers) were more closely matched and had sligthly better decay (shown in waterfall) FR and sound, after mods, are indistinguishable to my ears.
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Deleted
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Post by Deleted on Apr 8, 2013 14:03:33 GMT
Thanks Frans, I'll think about the T50
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Rabbit
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Post by Rabbit on Apr 8, 2013 17:14:49 GMT
Mick, have you attached a filter yet?
I'll be trying an O2 with mine soon since I haven't rigged up a fancy power supply!!
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Rabbit
Administrator
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Post by Rabbit on Apr 8, 2013 21:01:06 GMT
Hi Mick, I've been waiting for you to get the filter since it is a dramatic change and the top end becomes a different beast altogether. Much like 'blowing your nose so your head clears!!!' With regards to the other place, I guess repairs are being attempted after the mass action. The recent display was the end for me. I was very grateful to you for the 'chat' since I did feel somewhat isolated by the whole thing. Not any longer - absolutely for the best. I've had different reports regarding the O2. Some ok, some really good. One thing for sure is that it has power. That's what I'm after really since I can then take my beloved T40 with me on trips and get some good portable use out of it. The nice thing about the O2 for you guys, is it can be bought cheaply as a kit as long as you can get it together, you have a really cheap and powerful amp. I've been though all my portables and they all exhibit 'clipping' to a greater or lesser extent on battery. I never had a chance to try the Zigis on a power supply. That could be ok I guess. I would have had a look at the new one if there hadn't have been a problem with the charging that Chris had, although I think the price is higher than an O2. I'm borrowing one and if it works out, I'll get one. I don't mind the Senn PX100 or something similar, but to be honest, it's not long before I want something bigger. It may be psychological; I'm not sure. I just want to be able to use my better headphones to their best and the only one I've seen with such a lot of output power is this one. Or I could do what you're doing with the Zigis. Add a battery pack. Mine is probe to noise when connected to the mains and so far have only managed to find a 24v supply but the hum is a pain. That could be the supply though and perhaps on the end of something decent like a Little Pinkie, it would behave but I've shot a hole in my boat as far as that goes now!!
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BMF
contributing
Posts: 99
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Post by BMF on Apr 12, 2013 16:12:10 GMT
Frans, I recently added another layer of fun to modding headphones---> Tube amps with NOS Vintage Tubes, New Production Tubes, and Tube Testers. I bought some Psvane and Sophia Electric tubes. These are current production tubes from Chinese companies. They sell 12AU7 tubes, for example, at various price points based on *matching* triodes and/or pairs of tubes. Better matched tubes command higher prices. I figured the same is true for T50RP vs the T40/20's prices:performance. T50, I have a sneaky feeling Foster selects the best matching drivers for the T50. The production costs for these headphones are relatively the same. The T20 has 1 small piece of plastic less in it compared to the T40. The T50 has the piece of plastic replaced by a piece of acoustic paper and a different color (copperish) cup holder. The difference in price between T50 and the others is hard to justify with only the copperish metal rods as a difference so suspect they put a bit more (matching ?) efforts in their TOTR The T40's I modded both had some differences between L and R driver. Fortunately they were similarly off so could easily make 2 closer matched T40's The T50 I had (older black drivers) were more closely matched and had sligthly better decay (shown in waterfall) FR and sound, after mods, are indistinguishable to my ears.
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solderdude
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Post by solderdude on Apr 12, 2013 16:55:48 GMT
No unfortunately, still waiting for an update from Frans, he is in the process of upgrading the pcb board for the T50`s. Happy with them without filter at present, so no real worries. The wait shouldn't be too long any more. The filter PCB is finished (or very close to it) and if I can't find any obvious errors will be ordered soon. Perhaps at the end of the month PCB's might be available. Also need to write a new article as it has different schematics and various power options. The effect of the filter in the HE6 is not dramatic yet noticeable. The T50 turns into a completely different headphone.
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Rabbit
Administrator
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Post by Rabbit on Apr 12, 2013 17:33:58 GMT
How's it different Frans? Is it to work with different pads or Shure's?
BMF, Frans designed the Sunrise/Horizon amps with Jeremy in the USA so those tubes might well come in handy!! I have a Horizon which is really powerful and dynamic. (amongst my collection!!) There is something about valves that I really enjoy as well.
New amp on the way as well - the Ember.
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BMF
contributing
Posts: 99
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Post by BMF on Apr 12, 2013 23:47:57 GMT
Hi Ian, I'm "with you" regarding Frans' and Jeremy's Amp Escapades! I have the Project Sunrise II amp and LOVE it with a variety of tubes. My current favorite is a 1968 NOS/NIB Telefunken E88CC from Ulm. WOW! It beats out my Dacmini which I really like. Congrats on the Ember! Keith How's it different Frans? Is it to work with different pads or Shure's? BMF, Frans designed the Sunrise/Horizon amps with Jeremy in the USA so those tubes might well come in handy!! I have a Horizon which is really powerful and dynamic. (amongst my collection!!) There is something about valves that I really enjoy as well. New amp on the way as well - the Ember.
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dicky
quite active
Posts: 230
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Post by dicky on Apr 13, 2013 6:23:49 GMT
No unfortunately, still waiting for an update from Frans, he is in the process of upgrading the pcb board for the T50`s. Happy with them without filter at present, so no real worries. The wait shouldn't be too long any more. The filter PCB is finished (or very close to it) and if I can't find any obvious errors will be ordered soon. Perhaps at the end of the month PCB's might be available. Also need to write a new article as it has different schematics and various power options. The effect of the filter in the HE6 is not dramatic yet noticeable. The T50 turns into a completely different headphone. Frans, is this new filter PCB just for the T50 - or will it cater for other HPs like the last design? Regardless, please put me down for a couple, Frans.
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solderdude
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Post by solderdude on Apr 13, 2013 8:16:01 GMT
The new PCB is like the old one (same headphones can be corrected as in the manual) but in ADDITION it has an extra notch section so T40/50's can be corrected without the need for the add-on. On top of that addition it also has provisions for a number of different power options. 1: From a regulated dual power supply 2: From an unregulated dual power supply (has regs on board) 3: From a single floating power supply (via onboard DCDC converter) 4: From a single floating power supply voltage (via onboard rail splitter) 5: From a battery (with TS912 opamps) for portable use (not for T40/50 portable use)
So only a voltage and in and out need to be connected. No more add-on PCB's and efforts to create of board power supplies.
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Rabbit
Administrator
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Post by Rabbit on Apr 13, 2013 8:42:22 GMT
Congrats on the Ember!Oh .... sorry, Keith. I've just realised that I've given you the impression that I have one on the way. What I meant was they are going to be available!!!! I have an O2 on the way so that I can try the T40/T50 mobile with an amp capable of delivering some real power. I have found portable amps on batteries don't provide enough for good, clean peaks on them so I had a look for something that might deliver real power. Congratulations btw on all of that work that you did on Headfi. When I first saw that, I couldn't believe the trouble that you had gone to and the detailed descriptions have become a reference for many modders. I love the power of the Horizon. It drives the K601 like a portable headphone at 120 ohms output impedance which helps to tame the treble!! Of course, if Jeremy wants an Ember to turn into a full blooded fire, I could always review it for him!! The T40/T50 is spectacular in that it doesn't 'sound' spectacular. I know that sounds weird, but first impressions could well be that it sounds quite 'normal' with no big bass or toppy cymbals, but that's exactly what I like about it. So, listening to one could leave people 'underwhelmed'. To me, it's very even handed and that's its strength. I was very grateful to Frans for going to so much trouble for me as well in that he measured what he was doing along the way in order to get it as smooth/flat as he could. It has become my main headphone now as well. It's the one I turn to for 'honest' listening.
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dicky
quite active
Posts: 230
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Post by dicky on Apr 13, 2013 12:13:38 GMT
The new PCB is like the old one (same headphones can be corrected as in the manual) but in ADDITION it has an extra notch section so T40/50's can be corrected without the need for the add-on. On top of that addition it also has provisions for a number of different power options. 1: From a regulated dual power supply 2: From an unregulated dual power supply (has regs on board) 3: From a single floating power supply (via onboard DCDC converter) 4: From a single floating power supply voltage (via onboard rail splitter) 5: From a battery (with TS912 opamps) for portable use (not for T40/50 portable use) So only a voltage and in and out need to be connected. No more add-on PCB's and efforts to create of board power supplies. It sounds great, Frans. I can't wait!
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