kevin gilmore Posted October 12, 2013 Report Posted October 12, 2013 enough people have been asking for this, we finally decided to do it. It was easy from the current layout. Best to stick with +/-400v power supplies http://gilmore.chem.northwestern.edu/kgst.jpg
spritzer Posted October 12, 2013 Report Posted October 12, 2013 To add to this then there is the mod to the SRM-007t which turns it into a KGST, aka a mini BHSE.
nopants Posted October 13, 2013 Report Posted October 13, 2013 Have the pinouts of the smd components been fixed? I seem to remember there being an error on the kgsshv board, the input fet pair I think? Any special current requirements for the HV transformers?
kevin gilmore Posted October 13, 2013 Author Report Posted October 13, 2013 (edited) yep, the input fet has been fixed. also, next version of the kgsshvk board has it fixed too. (at least I think its fixed, please check) hv transformer is going to be lower voltages. best idea to have a separate filament transformer and time delay. current power supply board works fine with the resistors adjusted for 400v which means the unregulated voltages should be about 465v. will post newest picture, same name in a few minutes Edited October 13, 2013 by kevin gilmore
wink Posted October 13, 2013 Report Posted October 13, 2013 Is this what the eXstatA should have been?
spritzer Posted October 13, 2013 Report Posted October 13, 2013 Yes, if Alex had any clue. This one is also cheaper to build when done at lower voltages. It's been one of these projects that has been on the backburner for way too long. Here is mine, adapted from boards Marc did and pretty close to what I'm doing with the SRM-007t. Still in that... works but not finished stage along with dozens and dozens of other projects. Been like this since 2011...
wink Posted October 13, 2013 Report Posted October 13, 2013 How's it compare with the "Light Flashing Lightning" you have the KGST parked on.? 1
wink Posted October 13, 2013 Report Posted October 13, 2013 (edited) Stupid double post. Edited October 13, 2013 by wink
spritzer Posted October 13, 2013 Report Posted October 13, 2013 That case used to be our version of the LL but it made no sense to finalize it so the mini ESX inherited the case. That one has the original Exstata PSU which naturally is shit so that needs to be fixed.
gustavo.skn Posted October 14, 2013 Report Posted October 14, 2013 How this KGST stands in sound quality with O2mkI against the KGSSHV? And in build difficulty? Thanks
nopants Posted October 14, 2013 Report Posted October 14, 2013 seems like it's the same tier as the hv, and easier to build (because we don't have to mount output devices to heat sinks) What's the current output at the last stage, 10mA? Can we also use the 01n100nd? I only ask because I have a shipment of those coming in with enough extras for the CCS.
kevin gilmore Posted October 14, 2013 Author Report Posted October 14, 2013 yes 10ma in the output stage. That's 80% of the tube rating. you can use the other parts, but they are not as temperature stable.
spritzer Posted October 14, 2013 Report Posted October 14, 2013 How this KGST stands in sound quality with O2mkI against the KGSSHV? And in build difficulty? Thanks Mine is pretty different so it hard to compare against this version. If anybody has heard a fixed SRM-007t it's like that except more better.
eggil Posted October 14, 2013 Report Posted October 14, 2013 Moar better than the 007? Yes Moar better than the KGSSHV? Nosiree!
spritzer Posted October 14, 2013 Report Posted October 14, 2013 Well... it is more similar than not. Lower voltage but the KGSSHV was never really about the voltage...
palchiu Posted January 1, 2014 Report Posted January 1, 2014 I've done BOM for KGST, may please double check. Thanks! https://docs.google.com/spreadsheet/ccc?key=0Ah_gUy3jQOfTdEtNLURhTEtEQnJxNDVydjgxaU95SVE&usp=sharing PS:The LED P/N is 1.7V that I copy from Tran's BOM. But Original KGSSHV's P/N is 2.1V. Need confim for this.
nopants Posted March 5, 2014 Report Posted March 5, 2014 Can you talk a little bit more about the boards on which you built your kgst spritzer? what is the vulcan?
spritzer Posted March 5, 2014 Report Posted March 5, 2014 Marc drew it up (or had it drawn up, can't remember) back in the day and it's basically the front end off the SRM-007t coupled to a CCS loaded quad of 6S4A's. I modified the boards to turn them into a KGST so just one tube per phase and a simple 10M90 ccs. Works well enough but I'll probably put the boards back on a shelf in favor of the ones I'm designing now. This is a part of larger move to possibly make a limited run of KGST amps. A couple of friends have been asking for a mini Blue Hawaii that would be as slim as is possible for desktop use. The KGST is the most logical circuit for that and it would be fun to do a custom chassis with some over the top PSU design in a separate box. The design is pretty much ready in my head but I simply need to find some time to invest in it and see if any of this can be done locally for me. None of this would be cheap though but that's hardly the point when making something cool... 1
nopants Posted March 5, 2014 Report Posted March 5, 2014 (edited) killing me, too many designs to play with also a reminder to move my megatron into the office Also if you have room for one more please pencil me in for that run of amplifiers Edited March 5, 2014 by nopants
Kerry Posted March 6, 2014 Report Posted March 6, 2014 Totally interested Can't wait to see what you come up with. I'm thinking of this for an office rig. I'm wondering how well it would drive O2's.
kevin gilmore Posted March 6, 2014 Author Report Posted March 6, 2014 (edited) prototype drives O2's very nicely. Edited March 6, 2014 by kevin gilmore
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