luvdunhill Posted June 16, 2014 Report Share Posted June 16, 2014 Kevin/Birgir: Is the 10K series resistor on the input from the original T2 (which used a 10K pot) or was it changed to reflect the 50K pot on the schematic? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 16, 2014 Report Share Posted June 16, 2014 same 10k input resistor, same 100pf cap. original was 10k x 4 pot. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 16, 2014 Report Share Posted June 16, 2014 That makes sense. TL;DR version: With a 10K pot you have a cut-off frequency of 80kHz-160kHz, depending on pot rotation and time constant of 2ms-1ms. I find 0.5ms-1.5ms to be inaudible, and 1-2ms is acceptable. With a 50K pot and 10K, you get -3dB at 26kHz worst case, and 6ms group delay. In my opinion, this is suboptimal, and I'd consider reworking the values if I had a source wimpy enough to not use a 10K pot. Quote Link to comment Share on other sites More sharing options...
iwik Posted June 25, 2014 Report Share Posted June 25, 2014 Can someone tell me what size of Sheathing they used for the umbilical cord. Thanks Les Quote Link to comment Share on other sites More sharing options...
iwik Posted June 28, 2014 Report Share Posted June 28, 2014 On Kevin's original pcb R11 was a 490K single .5watt. I notice on the next revision board this was a 250k in series with a 240k. Was there a problem with the single resistor setup. Thanks Les Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 28, 2014 Report Share Posted June 28, 2014 R11 is 150K on the amp schematic I am looking at... Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 28, 2014 Report Share Posted June 28, 2014 iwik is talking about the power supply, and technically the resistor was running very close to its voltage limits. So its now 2 resistors in series. Same value. Its on both of the 500v supplies Quote Link to comment Share on other sites More sharing options...
iwik Posted June 28, 2014 Report Share Posted June 28, 2014 Thanks Kevin, I'll change to two then. Les Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 29, 2014 Report Share Posted June 29, 2014 Ah. You might look at Vishay HVR37 series, I think that is what I used and also on the stacked caps and other HV locations.. Quote Link to comment Share on other sites More sharing options...
iwik Posted June 29, 2014 Report Share Posted June 29, 2014 Thanks, Must remember to include in my next order. Better than trying to fit two resistors. Les Quote Link to comment Share on other sites More sharing options...
artvlas Posted July 4, 2014 Report Share Posted July 4, 2014 Where to buy printed circuit boards? Have the latest list of items? Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted July 4, 2014 Report Share Posted July 4, 2014 Last I heard Wal-Mart was sold out. Perhaps try Target? 2 Quote Link to comment Share on other sites More sharing options...
iwik Posted July 8, 2014 Report Share Posted July 8, 2014 (edited) In the power supply the mod that was added, .1uf in series with the 10k between the voltage reference and the OP27 what type and voltage rating did you use for it. Thanks Edited July 8, 2014 by iwik Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted July 8, 2014 Report Share Posted July 8, 2014 same as any of the .1uf ceramic caps, 15v or more Quote Link to comment Share on other sites More sharing options...
iwik Posted July 8, 2014 Report Share Posted July 8, 2014 Thanks Quote Link to comment Share on other sites More sharing options...
niner Posted July 15, 2014 Report Share Posted July 15, 2014 Did anyone talk to Lil Knight lately? I'm in his T2 chassis groupbuy, but have not heard from him for a while. He hasn't responded to my email either. Quote Link to comment Share on other sites More sharing options...
shipsupt Posted July 15, 2014 Report Share Posted July 15, 2014 I've been trying to reach him lately... no reply here or on email. I know he was having some issues getting the vendor to deliver, then he went radio silent. Quote Link to comment Share on other sites More sharing options...
niner Posted July 15, 2014 Report Share Posted July 15, 2014 Thanks. About a month ago, he told me parts were sent to be anodized, and should be ready in 7-10 days. Quote Link to comment Share on other sites More sharing options...
purk Posted July 15, 2014 Report Share Posted July 15, 2014 Did anyone talk to Lil Knight lately? I'm in his T2 chassis groupbuy, but have not heard from him for a while. He hasn't responded to my email either. I just talked to someone who commissioned him to build a maxed out KGSSHV for $4k and he can't seem to be able locate him either. Hope he will surface eventually. Quote Link to comment Share on other sites More sharing options...
niner Posted August 6, 2014 Report Share Posted August 6, 2014 Who else on Lil Knight's chassis group buy, but haven't received it yet? I have tried, but didn't get any response from him. Quote Link to comment Share on other sites More sharing options...
shipsupt Posted August 6, 2014 Report Share Posted August 6, 2014 (edited) I know of myself and two others here. I've been pinging him every once in a while, with no joy. I noticed he logged in over at head-fi recently so I have to assume he's actively avoiding us. Sad, I did quite a few little deals with LK and it always turned out well... My guess, he got screwed by his vendor in China and doesn't know what to do now. 'course I'm just speculating. Edited August 6, 2014 by shipsupt Quote Link to comment Share on other sites More sharing options...
justin Posted August 6, 2014 Report Share Posted August 6, 2014 I wouldnt know but when dealing with chinese companies, payment is always upfront. At least thats been my experience Quote Link to comment Share on other sites More sharing options...
nopants Posted August 6, 2014 Report Share Posted August 6, 2014 I pinged him, no response Quote Link to comment Share on other sites More sharing options...
niner Posted August 6, 2014 Report Share Posted August 6, 2014 (edited) So that makes at least 4 of us still waiting. At this point, I consider to take unfinished stuff from Tran. It is better than losing the whole sum. Edited August 6, 2014 by niner Quote Link to comment Share on other sites More sharing options...
charlo89 Posted August 6, 2014 Report Share Posted August 6, 2014 Tran sent me only the half of my order, I ordered and payed a kgsshv offboard and I have not received it, I saw the kgsshv offboard is now out of stock... no response since my order was sent in october (mail and head-case) Quote Link to comment Share on other sites More sharing options...
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