June 24, 201214 yr Deadlylover definitely has his going. 1 Kevin Gilmore 2 Spritzer 3 Horio 4 Dave 5 Blubliss 6 Victor Chew 7 Hdman 8 Johnwmcclean 9 Eggil 10 T-Money 11 Deadlylover
June 24, 201214 yr ^^ Mine has been going strong since November 1 Kevin Gilmore 2 Spritzer 3 Horio 4 Dave 5 Blubliss 6 Victor Chew 7 Hdman 8 Johnwmcclean 9 Eggil 10 T-Money 11 Deadlylover 12 cobra_kai Edited June 24, 201214 yr by cobra_kai
June 24, 201214 yr 1 Kevin Gilmore 2 Spritzer 3 Horio 4 Dave 5 Blubliss 6 Victor Chew 7 Hdman 8 Johnwmcclean 9 Eggil 10 T-Money 11 Deadlylover 12 cobra_kai 13 JoaMat 14 Livewire 15, 16, 17 Hennyo , I assume this is the guy Kevin refered to that had 3 working. Edited June 24, 201214 yr by eggil
June 24, 201214 yr Well, they were sort of working. Except one of them. http://www.head-fi.o...-stole-my-money Wouldn't count on the others without proof of performance. Edited June 24, 201214 yr by wink
June 24, 201214 yr Youse missed Tari on post 1838 "10 - Tari I'll post a couple pictures when I get the chance. " 1 Kevin Gilmore 2 Spritzer 3 Horio 4 Dave 5 Blubliss 6 Victor Chew 7 Hdman 8 Johnwmcclean 9 Eggil 10 T-Money 11 Deadlylover 12 cobra_kai 13 JoaMat 14 Livewire 15 Tari (16, 17, 18 Hennyo , I assume this is the guy Kevin refered to that had 3 working.) perhaps....
July 11, 201213 yr This morning I turned on the kgsshv, and nothing. Blew a fuse. Put in another fuse and it fired right up.......with a faint buzzing coming from the transformer. Then the smell of magic smoke accompanied with substantial heat rising from the toroid. Seems like my SumR piece of shit has a short. Oh well, I have yet to tear into it and form a plan of action. I'll just fire up my itty-bitty Stax amp and experience bliss without the bass. FWIW, Previously I did order from SumR, the beefier (100ma?) trafo spec that Spritzer mentioned. I think that I may head to ebay and pick up a cheap Hammond dual 500 volt job and be done with it. I have a 15VDC Sola brick (ala the original kgss) that I will be using in addition for the low-v stuff. Same thing just happened on my HV. My specs were the lesser ones (65VA, 70ma on the hv windings). This is my fourth SumR transformer to blow on the HV winding (3 from the T2). Pissing me off now. Did you end up with a Hammond livewire? SumR has replaced all my other transformers basically for free (had to send a few back).
July 11, 201213 yr Author This transformer stuff makes no sense and is really pissing me off. The DC current to the amplifier (both channels) is 45ma 70ma AC absolutely should be enough. None of my prototype transformers have ever blown, and some are 3+ years old with lots and lots of use including accidentally being left on for a week. The testing i did for justin's bhse transformer was a 150% overload for 3 days, no problem. Maybe time to find someone to make some R core transformers for us because those are linear windings, not subject to kinks or other issues with winding a torroid.
July 11, 201213 yr All my HV transformers are 100mA+ and no problems at all aside from some buzzing. I'd be all for some R-cores but we'd probably have to go to Japan for them. The Chinese ones are rather poor...
July 11, 201213 yr Same thing just happened on my HV. My specs were the lesser ones (65VA, 70ma on the hv windings). This is my fourth SumR transformer to blow on the HV winding (3 from the T2). Pissing me off now. Did you end up with a Hammond livewire? SumR has replaced all my other transformers basically for free (had to send a few back). Hi Andy, No I didnt. Frank Cooter chimed in a while later and recommended that I look into an off the shelf Antec toroid. They cost about 1/3 the price of the Hammond, about $54 IIRC. He also mentioned that it was a good idea to multiply the required current spec by a factor of three or thereabouts to help with the inrush and keeping it running cool. Yay Team Overkill ! I went with a 400ma monster toroid. Dual 450VAC windings, I was just barely able to shoehorn it into the chassis. It does run cool. I will be using one of these for my upcoming KGBH build, they are available with dual 6.3V heater windings on the same core.
July 11, 201213 yr If you use 6.3V windings on the HV transformer and use a delay circuit for the 6CA7 heaters, you need to add Relay into the HV lines (secondary) instead of the 120v primary line... Edited July 11, 201213 yr by Inu
July 11, 201213 yr Author correct, and you will need 2 of them and they have to be 1kv rated reed relays. Anything else sparks pretty nasty.
July 12, 201213 yr Livewire, do you have a part number for that Antek? Doesn't appear to be listed on their site.
July 12, 201213 yr If you use 6.3V windings on the HV transformer and use a delay circuit for the 6CA7 heaters, you need to add Relay into the HV lines (secondary) instead of the 120v primary line... Thanks Inu and KG for the input. To be honest, I was going to build it as outlined in the headWize KGBH article. (one big donut without relay delays) A quad of JJ tubes are cheap enough, lower life due to hard startup doesnt concern me much. (as long as it doesnt blow up all of the time.) In this case, I would prolly also take the precaution of having the phones unplugged to avoid popping surges on startup. I do have a delay board on the way, but havent seen it yet, so dont know it's absolute function. If I understand this correctly, upon start-up, a slow start circuit for the heaters is best, followed by a ~40 second delay before HV is gradually applied to the plates. During this interval, it is best if the input is attenuated as well. I know this has been asked before, but would there be a problem using DC for the heater voltage? I've heard that AC can induce hum. Edited July 12, 201213 yr by livewire
July 12, 201213 yr odd subject for the KGSSHV thread is there really any issue with power sequence in the BH - the ss ccs loads always limit the output tube current
July 12, 201213 yr do have a delay board on the way, but havent seen it yet, so dont know it's absolute function. It does exactly that, delay the HT transformer for about 55s give or take. It's the same circuit that Kevin put on the t2 psu board but with a small 12v regulator on it for power. If you don't have two separate transformers then I guess you'd have to relay the secondaries... which makes me nervous for some reason. Is it ill founded worry? (serious question)
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