nice to have someone who understand you sometimes 🙂
looking at the blue load lines pic at 90/100V voltage it seems that with 10V change we have near 800ma variation. so let say that we have 12/13ohm resistance here..
or i'm totally wrong 😀
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ultrapath cap
hi folks, i have made a little change on my ironamp swapping the gate bias and just put a 56R source resistor . as some SET tube amp i 'm using the " ultrapath" capacitor between the source and the B+ and no bypass source resistor. is there a " magic" value or a calculator for this ultra path cap ? ( for the moment i use a 100uf MKP) and i feel i 'm missing some low end .
hi folks, i have made a little change on my ironamp swapping the gate bias and just put a 56R source resistor . as some SET tube amp i 'm using the " ultrapath" capacitor between the source and the B+ and no bypass source resistor. is there a " magic" value or a calculator for this ultra path cap ? ( for the moment i use a 100uf MKP) and i feel i 'm missing some low end .
easiest to try
put some electrolyt in parallel for test
if bass is better , replace with solid cap
put some electrolyt in parallel for test
if bass is better , replace with solid cap
last bullet for the year.. i need some gain with my ironamp , i have now mine running with RC input instead of transformer with -20V bias on the gate. my plan to get some gain is to use this -20V to power a 2SJ74 direct coupled to the 2SK82 . what will be the `jfet source resistor value needed with this voltage?
i have done it with the TL431 bias of the CSX1 but it not worked , it sucks too much current and i can't have 20V anymore on the 2SK82 so the fuse blow .. not the VFET ..
anyway i'm sure it"s a bad idea 😀
anyway i'm sure it"s a bad idea 😀
Would this heatsink do for my IronAmp?
NV115-1 AAVID THERMALLOY Natural Convection Heat Sinks | 10WX1029 | Newark element14 Canada
Regards,
Dan 😛
NV115-1 AAVID THERMALLOY Natural Convection Heat Sinks | 10WX1029 | Newark element14 Canada
Regards,
Dan 😛
i have build both and prefer the ironamp ( with some tweaks 🙂 ) the 2SK82 will dissipate 33wat so not a big deal for a decent heatsink 🙂
Which tweaks?
Some of my thoughts on parts.
Antek Toroids for the transformers Transformers - AnTek Products Corp
I have some spare Peter Daniel Rectifier boards
http://www.diyaudio.com/forums/swap-meet/99351-wtb-f4-pcb-boards-24.html#post1237660
I have some spare 159ZL's sitting around. Would they be suitable?
http://www.hammondmfg.com/pdf/5c0032.pdf
I was think of some sort of RC circuit RC time constant / voltage calcultor to delay the relay powering B+ picking up.
And so on and so on......................
Regards,
Dan 🙂
Perhaps the most challenging part of building this IronAmp would be finding suitable power supply capacitors?
2X NEW Kendeil 22000uF 100V K01 Caps Krell KSA50 Naim Hicap Leach AMP | eBay
Regards,
Dan
2X NEW Kendeil 22000uF 100V K01 Caps Krell KSA50 Naim Hicap Leach AMP | eBay
Regards,
Dan
Perhaps the most challenging part of building this IronAmp would be finding suitable power supply capacitors?
2X NEW Kendeil 22000uF 100V K01 Caps Krell KSA50 Naim Hicap Leach AMP | eBay
Regards,
Dan
Sorry, referring to Michael's schematic these would be a better choice,
2pcs NEW Kendeil 4700uF 100V K05 105C HI END Caps FOR Audio QUAD303 Naim AMP | eBay
And,
10pcs Siemens B41070 B9477 T 470uF 100V HI END Audio Capacitors FOR Audio | eBay
Regards,
Dan 😱
i went to the CLC road , with 2000uF 4H choke and 400uf MKP expensive but the last cap make the sound 🙂
