May 22, 20188 yr On 30/04/2018 at 5:51 PM, mwl168 said: @ Kevin and Kerry; with all these great work and progress being made, will there be a second generation T2 soon that makes use of these advancements and current production parts and maybe a bit smaller in size? I would be happy to organize a GB for it. Really, there's no interest in a T2 "version 2.0" ?
May 22, 20188 yr 39 minutes ago, jose said: Really, there's no interest in a T2 "version 2.0" ? Guessing that is the case because if you want to build a T2, you can with the existing boards (albeit with a higher parts cost). The only thing I could see that might be worth while updating would be the power supply, but even then.
May 22, 20188 yr personally I'm more interested in new designs at this point, but I might be biased DC Megatron plsSent from my Pixel 2 XL using Tapatalk
May 22, 20188 yr I was thinking on a version with current components. Not a clone, rather an improved version. It's the same thing that happened with the BH. Why not with T2?
May 22, 20188 yr 6 minutes ago, jose said: I was thinking on a version with current components. Not a clone, rather an improved version. It's the same thing that happened with the BH. Why not with T2? The DIY T2 is the improved version of the Stax original. From what I understand, the newer/other versions that for example Joamat and Kerry have made are not necessarily improved versions of what Kevin did, but rather use some more affordable and more easily obtainable parts. I suspect that the interest in building this newer version will still be limited as the newer parts probably only shave $300-$400 off the parts cost of building the T2 - and since it would still remains a mega-buck build, what is an extra $300-400? And it is inevitable that those newer parts will soon be hard to find as well.
May 22, 20188 yr Maybe you have right but for example I don´t want to spend time found obsolete parts or checking if my sand is a fake or not. One thing I have very clear is that I would never clone the box for example and presumably this is one of the most expensive components. I doubt that Dr. Gilmore wants to redesign the box. For other hand and following your way of thinking, for example I wouldn´t have a BH since the original has obsolete or hard to find components. Thanks to Dr. Gilmore and his latest revision I have an amplifier that otherwise would be impossible to do (for me, of course I suppose that it will be much easier for you). I do not know if I explain myself correctly and I do not want to offend anyone either. It's just my point of view. However, seeing that there are so many "buts" maybe a ver 2.0 is not a good idea.
May 22, 20188 yr There are a lot of great ideas in here for various modifications, it's just a very labor intensive activity to pull it all together. I agree with George that your best bet is going with the currently available boards. It's a supported board which is part of the problem on something new.
May 24, 20188 yr On 5/22/2018 at 10:41 AM, GeorgeP said: Guessing that is the case because if you want to build a T2, you can with the existing boards (albeit with a higher parts cost). The only thing I could see that might be worth while updating would be the power supply, but even then. You can dual power supply
May 24, 20188 yr I've tried using golden reference HV supplies for the T2, but had some issues with negative rails as well as the current limiting when an issue occurs. I ended up reverting back to Kevin's original design. I will spend some more time with this in the future. My current GR HV mini board include depletion mode MOSFETs for current limiting in front of the GR HV supply similar to Kevin's T2 design. I'm also experimenting with a couple of ideas on how to enhance the current limiting on the GR HV (in case of a short), but need some more time for testing and $$$ for parts (... and a blast shield)
July 9, 20187 yr Hello everyone, i'm just getting started on trying to build a T2, picked up the boards, transistors, and a chassis set. I've been reading through this thread for the last week and really enjoying it but one problem is all the pics that Kevin posts are no longer on his server. I understand he retired and moved his files, and i have found two of the archives at these locations: https://drive.google.com/drive/folders/0B_iJFfZStuVhSE5nOHBVdTByR1k https://drive.google.com/drive/folders/0B7egryukiT7_TFlEQlBRejdVdDQ But I couldn't find any pics. I guess i don't really need them but it would be great to see what he is posting about... Thanks everyone -James
July 17, 20187 yr Okay just finished the thread i see those early pictures aren't so important, but what a great thread, just received my chassis, board set, and sand... Mouser order is delivering today... The umbilicals were pre built but i'm going to check all those out.... a few parts here and there seem to be hard to find... mainly the six 680uF/450v caps... and zener 130... But i'm still researching so i'm sure i'll find something.... never built anything like this before but that is the whole point :):) Anyways great thread, going to read it again while i'm on vacation this week
July 19, 20187 yr Okay i need to order the transformers, it looks like SumR is the place to use if you are in the US, I have some notes Kevin posted on getting them built from 2010: high voltage transformer x 2 are needed diameter 3.5 inches height 1.7 inches you can actually go up to 2.5 inches high, and slightly wider full load voltage---- regulation--- Iac--- off load 475 --- 15.04 --- .13 --- 546.4 285 --- 10.53 --- .06 --- 315 75 --- 10.6 --- .06 --- 82.9 filament transformer x 1 is needed diameter 3.5 height 1.6 30 --- 13 --- .5 --- 33.9 Center tapped 6.3 --- 14.29 --- 1.5 --- 7.2 6.3 --- 14.29 --- 1.5 --- 7.2 6.3 --- 14.29 --- 4.0 --- 7.2 6.3 --- 14.29 --- 4.0 --- 7.2 I sent SumR the specs they asked this in return: Do you require single primary or dual and what voltage do you require? What do you guys think? I have a lot to learn i'm sure but i would like to get these ordered correctly the first time. Thanks for any help, -James
July 19, 20187 yr Dual primaries would allow you to support both 120 and 240v applications. I always use dual, but wait for Kevin or Spritzer, etc. to comment in case there are any special considerations... Sent from my iPhone using Tapatalk
July 19, 20187 yr All the SumR transformers I bought were universal voltage. 100,120,200,240 dual windings, one tap per winding They should already know exactly what these transformers are. It would probably take me a while to dig up the original quotes. Edited July 19, 20187 yr by kevin gilmore
July 19, 20187 yr Don't go to the trouble i'll let them know, i was thinking they might have remembered making them before, thank you i'll see what they say
July 20, 20187 yr Bought my set of DIYT2 transformers from Richard a few months back, just tell him the Gilmore DIYT2 set (http://primroseaudio.com/transformer-designs/) *** He gave me only a single 117V primary *** Edited July 20, 20187 yr by Skooby clarifying
July 20, 20187 yr From SumR: The only versions we have done this year were dual and single primary. For dual primaries (110/220V) price would be $90.30. For a Universal primary would be $107.00 Please let us know what you decide. So, I"m thinking dual primaries are okay in case i ever want to switch it? PARS said he always goes that way... That is probably the way to go right?
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