May 22, 201016 yr Author added the tkd pot. adding the alps pot might be a bit tricky. Since they are on extenders like the T2, you can put it into any chassis you want. http://gilmore.chem.northwestern.edu/kgsshvamp.jpg first cut at power supply schematic http://gilmore.chem.northwestern.edu/kgsshvpower.pdf and bom (missing among other things the xlr jacks) but close http://gilmore.chem.northwestern.edu/kgsshvbom.xlsx The power supply costs more than the amplifier. (which is usually the case for high end stuff) You can certainly go cheaper and unregulated i you want... Board pair estimate about $50 (1 each stereo balanced amp board, and 1 power supply board)
May 22, 201016 yr I would love to hear one. Any chance someone besides Kevin will be building one in the next 6 months or so?
May 22, 201016 yr Author This will likely go down the same way as the T2, except i'm not doing chassis this time. (well except for me) So in a month or two after i have all 3 pots, and have measured 5 times or more to make sure everything will fit, then i will do a board run. Say 20 pieces of each. The boards are much cheaper than the T2 so its no big deal if it takes me a couple of months to get rid of them all...
May 22, 201016 yr I would love to hear one. Any chance someone besides Kevin will be building one in the next 6 months or so? You can expect one massive beast (10mm panels) featuring these boards ASAP being built up here.
May 22, 201016 yr Author You can expect one massive beast (10mm panels) featuring these boards ASAP being built up here. That is going to be a bit of a problem with the neutrik jacks... They are designed for 6.35 mm. Might fit anyway but they are going to bend a bit.
May 22, 201016 yr +/-350V being considered boring just shows how utterly bonkers we really are... 's'truth -- even as an innocent bystander over here, I didn't think twice about it, despite actually looking for what he considered boring.
May 22, 201016 yr That is going to be a bit of a problem with the neutrik jacks... They are designed for 6.35 mm. Might fit anyway but they are going to bend a bit. 6mm for the back plate, that's about the max most RCA's will fit. I'd probably wire most of the stuff off the board which leads to the next PM...
May 22, 201016 yr Author 's'truth -- even as an innocent bystander over here, I didn't think twice about it, despite actually looking for what he considered boring. SEE it goes like this.... The higher the power supply voltages (everything else staying the same) the faster the slew rates. The word OVERKILL does not seem to be in my vocabulary. It would take me a while to find it, but i think ti kan said the B22 did something like 75 volts per microsecond. I'm not sure i believe that, but then an electrostatic amp should be able to do 10 times that. Or 750 volts per microsecond. A non-trivial task for sure. Last nutty idea for this year... Anyone interested in a dynamic version of the T2 with 6as7's as output tubes?? Sort of a re-do of my original MIG amp, except completely circuit board based, with + and - 75 volt power supplies... Balanced ONLY. Although one of these days i'm going to do a DC coupled circlotron...
May 22, 201016 yr Could you countsink the front and back plate as needed? Birgir, if (as if "if" is the right word to use) I like the SRD7 and Lambda PRO you are to be blamed!
May 22, 201016 yr Balanced ONLY. How about those small and cheap Hammond input transformers? Not ideal but it gives the option of a SE input... Could you countsink the front and back plate as needed? I could but it requires milling and all I have is a drill press. I did find a place locally which could help me with that and the KGSSHV would be a good choice as any for them to make a chassis for me. There is also the option to just mount the connectors to the chassis as we usually do. Since I use SE inputs exclusively that is almost given with any amps I build. Birgir, if (as if "if" is the right word to use) I like the SRD7 and Lambda PRO you are to be blamed! You wouldn't be the first. n3rdling IIRC bought his first Stax setup from me and now I'm racing to finish my old BH for him...
May 23, 201016 yr Author What i ment to say for the T2 like dynamic amp, was BALANCED OUTPUT only. It would still be balanced or unbalanced input. The thing is that the servo will make both sides of the output zero volts, but with respect to ground it may still be 1 volt or more. (same as the nelson pass things)
May 23, 201016 yr depending on the thickness of the transformer which will mount to the back panel i'm pretty sure that if you do it as one box, it sends up 14 across by 11 deep with 1 inch between the 2 boards. I might have to make it a bit longer to accomidate the transformer. Looks like both boards will fit in the Hifi2000 Pesante Dissipante 300 mm depth case (14.75x12") if there is room for the transformer on the back panel.
May 23, 201016 yr SEE it goes like this.... The higher the power supply voltages (everything else staying the same) the faster the slew rates. The word OVERKILL does not seem to be in my vocabulary. It would take me a while to find it, but i think ti kan said the B22 did something like 75 volts per microsecond. I'm not sure i believe that, but then an electrostatic amp should be able to do 10 times that. Or 750 volts per microsecond. A non-trivial task for sure. According to the plot here: (on the Specifications pageThe β22 Stereo Amplifier (on the "specifications page) the slew rate on the beta22 is more than 200 v/microsecond (at least in the first results for the 100kHz square wave). So you're aiming for 2000 v/microsec Edited May 23, 201016 yr by Dreadhead
May 23, 201016 yr You wouldn't be the first. n3rdling IIRC bought his first Stax setup from me and now I'm racing to finish my old BH for him... Yep, a simple Stax Lambda Sig + SRM-1 mkII was enough to get me hooked. I'm finally nearing the end of the road though.
May 23, 201016 yr The word OVERKILL does not seem to be in my vocabulary... ...Although one of these days i'm going to do a DC coupled circlotron. Will there be a pcb?
May 23, 201016 yr Author Looks like both boards will fit in the Hifi2000 Pesante Dissipante 300 mm depth case (14.75x12") if there is room for the transformer on the back panel. If you do it with this case, there is plenty of room for everything and you can lay the transformer down. Its 3.5 inches in diameter and about 2 inches high, so on the power supply board that is 8.65 inches long there is plenty of room for the transformer.
May 23, 201016 yr Those cases can be made quite nice now that they are available as 100% aluminum. It can handle the heat of the BH so the KGSSHV would be a good fit.
June 28, 201016 yr Does the transformer for the KGSSHV have 2 separate 485V windings? How many VA? The second transformer is 30V centre tapped. How many VA?
June 28, 201016 yr Author 475 volt windings... 2 of them, completely seperated. 39 watts each 30 volts center tapped 10va
June 28, 201016 yr added the tkd pot. adding the alps pot might be a bit tricky. Since they are on extenders like the T2, you can put it into any chassis you want. http://gilmore.chem.northwestern.edu/kgsshvamp.jpg first cut at power supply schematic http://gilmore.chem.northwestern.edu/kgsshvpower.pdf and bom (missing among other things the xlr jacks) but close http://gilmore.chem.northwestern.edu/kgsshvbom.xlsx The power supply costs more than the amplifier. (which is usually the case for high end stuff) You can certainly go cheaper and unregulated i you want... Board pair estimate about $50 (1 each stereo balanced amp board, and 1 power supply board) Pin configuration of following Japanese small transistors are ECB not BCE. 2SC1815/C2240/C2705/A970 Shape of silk screens are opposite.
June 28, 201016 yr I only circled one channel. All of the ECB/jfet pin designations look correct to me. Edited June 28, 201016 yr by digger945
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