Deanbob,
I will try again. It was before the changeover that I had tried and maybe I am wrong but my memory tells me you did not have email enabled. I see that it is now. I do have around 200 unmatched left and if you are still interested you are welcome to as many as you would like.
Uriah
I will try again. It was before the changeover that I had tried and maybe I am wrong but my memory tells me you did not have email enabled. I see that it is now. I do have around 200 unmatched left and if you are still interested you are welcome to as many as you would like.
Uriah
Hi Scott,
The range is large and just depends on the characteristics of those 4 LDRs that it takes to make two stereo pots. I have ordered another 500 LDRs and first testing tells me they will find themselves from 5k-15k on average. The 5k LDRs could be used with a 200k pot and end up being quite a bit higher, like into the 15-20k range. I have not figured out all 4 match points yet and need to read over a lot of data to determine that. The first round of matching helps a lot but does not set the other 3. The 2nd round usually sets the next 2 rounds of matching. So I can guarantee 5-15k and that is usually the range anyway.
Uriah
Have had another customer tell me his Prometheus is now on the sidelines and another is putting his tubed preamp up for sale on ebay 🙂
Glad that those of you who bought on the last buy have been so successful building the LDR based potentiometer and are loving it so much.
Uriah
Glad that those of you who bought on the last buy have been so successful building the LDR based potentiometer and are loving it so much.
Uriah
Uriah:
One more dopey question before I order: is there any reason why the Lightspeed Attenuator won't work in an active preamp? I'm thinking about using it with a buffer (specifically, Pedja Rogic's buffer -- see http://www.justblair.co.uk/buildpedbuff.html) and your my_ref RevC amp boards.
Regards,
Scott
One more dopey question before I order: is there any reason why the Lightspeed Attenuator won't work in an active preamp? I'm thinking about using it with a buffer (specifically, Pedja Rogic's buffer -- see http://www.justblair.co.uk/buildpedbuff.html) and your my_ref RevC amp boards.
Regards,
Scott
Scott,
I used it with the MyRef without anything else at all. Beautiful.
Yes you can use it with a buffer or anything else that would use a pot. Thats all it really is anyway, a pot. Just made with two resistors that vary rather than one that is divided with a wiper.
Uriah
I used it with the MyRef without anything else at all. Beautiful.
Yes you can use it with a buffer or anything else that would use a pot. Thats all it really is anyway, a pot. Just made with two resistors that vary rather than one that is divided with a wiper.
Uriah
Hi Uriah,
Although you probably mentioned it in an e-mail or elsewhere, what is the ETA for the LDR's from this group buy, as I've forgot.
Cheers!
Although you probably mentioned it in an e-mail or elsewhere, what is the ETA for the LDR's from this group buy, as I've forgot.
Cheers!
Matching is taking a lot longer than I thought. I dont see it taking more than 3 weeks from now to ship them though.
I had a problem that was unforeseen and requires at least double the nights at the kitchen table testing.
Some are coming in for 100k and some are coming in for 200k or 250k. The 200k vs 250k is yet to be seen but now I have to test at many more than just the normal number of positions because the ones that need 100k to control them need to be tested at several different resistances than the ones that are going to need 200k or 250k. Its never happened before where one batch goes to several different control pots. Its always been 100k or 500k but never more than one at once.
I apologize guys and next time I will do the matching THEN announce that they are ready for purchase.
I am working on something special so if it gets done in time and doesnt cost me to much you should all see a little present in your box.
Sincerely
Uriah
I had a problem that was unforeseen and requires at least double the nights at the kitchen table testing.
Some are coming in for 100k and some are coming in for 200k or 250k. The 200k vs 250k is yet to be seen but now I have to test at many more than just the normal number of positions because the ones that need 100k to control them need to be tested at several different resistances than the ones that are going to need 200k or 250k. Its never happened before where one batch goes to several different control pots. Its always been 100k or 500k but never more than one at once.
I apologize guys and next time I will do the matching THEN announce that they are ready for purchase.
I am working on something special so if it gets done in time and doesnt cost me to much you should all see a little present in your box.
Sincerely
Uriah
HI Uriah,
Thanks for the update. You really do not need to apologise at all, as you are doing us all a great favour, in your time.
Cheers
Thanks for the update. You really do not need to apologise at all, as you are doing us all a great favour, in your time.
Cheers
Hi Uriah,
Thanks for you efforts. I am jumping the light train and I will send payment for 2 stereo sets. The only request I would make is if possible can you provide 2 sets that use the same pot value.
Thanks
Thanks for you efforts. I am jumping the light train and I will send payment for 2 stereo sets. The only request I would make is if possible can you provide 2 sets that use the same pot value.
Thanks
Looking forward to getting my set.
I have made a couple of Lightspeeds for practice with un-matched LDRs. I don't have much channel imbalance, although I have noticed when I turn it on the next day the image has shifted slightly and the trimmers need a bit of a tweak. Is this the real problem with un-matched LDRs?
I have made a couple of Lightspeeds for practice with un-matched LDRs. I don't have much channel imbalance, although I have noticed when I turn it on the next day the image has shifted slightly and the trimmers need a bit of a tweak. Is this the real problem with un-matched LDRs?
Does someone care to comment on the offering below from SKA Audio?
SKA Audio OptiVol
It would appear that this is a complete kit (including PCB) for $40AUS....or about $34US (including postage).
Am I missing something or is this phenomenal value when compared to buying the LDRs and the others bits you need as well as cobbling together a PCB from protoboard?
SKA Audio OptiVol
It would appear that this is a complete kit (including PCB) for $40AUS....or about $34US (including postage).
Am I missing something or is this phenomenal value when compared to buying the LDRs and the others bits you need as well as cobbling together a PCB from protoboard?
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Its not as good as the Lightspeed 🙂
It only uses LDRs in the series resistors and not shunt. The sound quality is reportedly great and reportedly not as good as this option. Reports from the same guy 🙂
At that price buy and compare!
Uriah
It only uses LDRs in the series resistors and not shunt. The sound quality is reportedly great and reportedly not as good as this option. Reports from the same guy 🙂
At that price buy and compare!
Uriah
OK. Agreed. I have taken another look at the pictures of the module and they do indeed appear to only sport the one set of LDRs.
Hello Uriah,
Can i have 2 stereo sets to use with the My_Ref? Is 100k pot ok? What do you use for yours?
Kind regards,
Ben
Can i have 2 stereo sets to use with the My_Ref? Is 100k pot ok? What do you use for yours?
Kind regards,
Ben
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