kevin gilmore Posted December 26, 2015 Report Posted December 26, 2015 kgsshv-carbon with the sic-fets turned into 6ca7 was going to be next year 2 Quote
nopants Posted December 26, 2015 Report Posted December 26, 2015 bh modern? how's the prototype (assuming you've built one) I thought the main issues around this were the fets needed to drive the el34 inputs Quote
kevin gilmore Posted December 26, 2015 Author Report Posted December 26, 2015 (edited) have not built one yet. may change the drive transistors to ksc2690A been thinking about this a while, saw no reason not to do the board. 5.6 x 4.7 inches Edited December 26, 2015 by kevin gilmore Quote
kevin gilmore Posted December 26, 2015 Author Report Posted December 26, 2015 board file posted I can do the same thing with the nanotube, for the ultimate in gigantic. fets, triodes... its all the same thing... Quote
nopants Posted December 26, 2015 Report Posted December 26, 2015 maybe the tube circlotron will be similar sized if you've got tubes instead of heatsink fun projects are getting more fun though, no parts headaches ATM Quote
spritzer Posted December 26, 2015 Report Posted December 26, 2015 This will form the basis of the new Blue Hawaii I'll build next year. Good thing here is that tube failure is far less catastrophic plus it should sound better. Quote
nopants Posted December 26, 2015 Report Posted December 26, 2015 I have some original bh boards here maybe I should case it so they can use the same power supply Quote
spritzer Posted December 26, 2015 Report Posted December 26, 2015 No problem running this at +/-400V but it can go up +/-450V. We could even do something like the T2 CCS and push it even further. Quote
Laowei Posted December 26, 2015 Report Posted December 26, 2015 Thanks for the belated Christmas present Kevin. What is the intended current thru each tube? Quote
kevin gilmore Posted December 27, 2015 Author Report Posted December 27, 2015 (edited) updated file current thru the tube designed to be 20ma, so a bit more than previous driver transistor is ksc2690a only, dissipates a little less than 1W, needs very small heatsink you loose about 45 volts across the tube, so +/-450 is ideal Edited December 27, 2015 by kevin gilmore Quote
sorenb Posted December 27, 2015 Report Posted December 27, 2015 (edited) What does the tube socket pin numbering refer to? Edited December 27, 2015 by sorenb Quote
kevin gilmore Posted December 27, 2015 Author Report Posted December 27, 2015 (edited) ignore the tube pin numbers, they do not show up anyway. its how that socket was made when I did the t2 picture above updated Edited December 27, 2015 by kevin gilmore Quote
sorenb Posted December 27, 2015 Report Posted December 27, 2015 would cascoding the 6S4A with KSC2690 be possible as well? apart from the j79 being obsolete would that be a suitable replacement for 2690? Quote
Kerry Posted December 27, 2015 Report Posted December 27, 2015 Very cool Kevin. I've modeled this as well and definitely want to build it. Thanks again for pushing us along Quote
Laowei Posted December 27, 2015 Report Posted December 27, 2015 2 hours ago, sorenb said: would cascoding the 6S4A with KSC2690 be possible as well? In a KGST? I don't believe it would work with a CCS on the tail as well as on each plate. That's a different circuit topology with a grounded cathode, rather than the BH, Carbon, and Kevin's latest grounded grid variants. Quote
kevin gilmore Posted December 27, 2015 Author Report Posted December 27, 2015 (edited) in the original kgbh, the 2sj79 can be replaced with a ksa1220A and the 2sk216 can be replaced with a ksc2690a. Not the same pinout. someone would have to test, but synthesis shows it would definitely work. in fact the ksa1220a and ksc2690a are faster and lower capacitance parts than the originals. Edited December 27, 2015 by kevin gilmore Quote
nopants Posted December 27, 2015 Report Posted December 27, 2015 im up for testing them in the original boards, need to get that thing finished anyway. does that make them similarly applicable in other designs like the t2, or the 6c33c amplifier? Quote
kevin gilmore Posted December 27, 2015 Author Report Posted December 27, 2015 the 2sj79 and 2sk216 are 200v parts, the ksa1220a/ksc2690a parts are 160 volts. would probably work if you are careful. Quote
joehpj Posted December 28, 2015 Report Posted December 28, 2015 How about PSU? Same as carbon? or the KGSShv PS? Quote
kevin gilmore Posted December 28, 2015 Author Report Posted December 28, 2015 same as carbon makes it easy to fit in the box Quote
wokstarr26 Posted December 29, 2015 Report Posted December 29, 2015 A very dumb question. How large is the heatsinks req for the 10M90S. Looking at the holes a L aluminum bracket is required to mount the board to an external heatsink. Or I am missing something here Quote
kevin gilmore Posted December 29, 2015 Author Report Posted December 29, 2015 (edited) 16 watts per channel for the 10m90s plus another 10 watts for each power supply Edited December 29, 2015 by kevin gilmore Quote
xianghao Posted December 30, 2015 Report Posted December 30, 2015 AWSOME! it seems that can use the KGSSHV-PSU( 450v ver) , carbon-PSU and BH-PSU. i can`t wait to be the first one to build it. Quote
Inu Posted December 31, 2015 Report Posted December 31, 2015 How about 2SC5171 / 2SA1930? 180V, Lower Cob(16PF), Flat hfe-Ic In Japan, popular than 2SC2690(A). Quote
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