I recently bought Toshiba Jfets from Spencer and he only has SJ74's with Idss > 10. According to advice I've received here, that's fine as long as you change R3 and R4 to 15R.
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Wow...That's not good. Fortunately, I have sets in reserve for the future in ideal ranges from Spencer and Punkydawgs.... With Spencer's supplies dwindling, the end may be a little more near.
Russellc
Ahhh… I realized it when I saw that list...
Foolishly I was thinking that I was out of a exotic parts problem with one purchase
dumbass...
Ok, damn, I hate being this ignorant... But...
Can I throw a "first world question" for this one...
Who is spencer or the other guy?! Any link please?
I don't know enough to have this kind of...
And, this tread is gonna be a blast if fat lady starts to sing... at the end
I'm moving this to my signature
Foolishly I was thinking that I was out of a exotic parts problem with one purchase
dumbass... Ok, damn, I hate being this ignorant... But...
Can I throw a "first world question" for this one...
Who is spencer or the other guy?! Any link please?
I don't know enough to have this kind of...
And, this tread is gonna be a blast if fat lady starts to sing... at the end
I'm moving this to my signature
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One of the advantages of putting the input stage on a field-swappable daughter card is: it gives you the option to build and listen to the amplifier, without buying Toshiba JFETs. Of course if you actually want to buy and use Toshiba FETs, you certainly can: it's an extremely simple card swap. Non-Toshiba options include daughter cards built with Fairchild JFETs, or daughter cards built with Burr-Brown JFET opamps, or semiconductors made by Analog Devices, or Motorola ... etc. Whatever YOU happen to prefer.
Congratulations!
I think I saw in official tread... (I'm reading it all over again
I can't go that fast, don't know enough... But, will get there, will get there
Congratulations!
I think I saw in official tread... (I'm reading it all over again
I can't go that fast, don't know enough... But, will get there, will get there
no rush, haste makes waste...
I just had all the parts
right now its just two big heatsinks tied together, no box, that may take some time, since the amp is functional
For the future:
As you are living in a beautiful place on earth, the temperatures are hotter than in Scandinavia or in (air conditioned) USA.
My advice is (I'm living in Brazil at the moment) to lower the bias setting, so that on the hottest day you can touch the heatsinks (55°C or max 60°C). ZenMod posted in the M2 thread how to do that, and I guess Mark Johnson also did this on his thread.
Other possibility: get huge heatsinks.
If you want an easy life, the cases from Hifi2000 (see here in the diyaudio shop, or google the Italian homepage) are from good quality and you just have to drill some holes for the Mosfets, the rest is IKEA style.
Enjoy the way!
Cheers,
Matthias
As you are living in a beautiful place on earth, the temperatures are hotter than in Scandinavia or in (air conditioned) USA.
My advice is (I'm living in Brazil at the moment) to lower the bias setting, so that on the hottest day you can touch the heatsinks (55°C or max 60°C). ZenMod posted in the M2 thread how to do that, and I guess Mark Johnson also did this on his thread.
Other possibility: get huge heatsinks.
If you want an easy life, the cases from Hifi2000 (see here in the diyaudio shop, or google the Italian homepage) are from good quality and you just have to drill some holes for the Mosfets, the rest is IKEA style.
Enjoy the way!
Cheers,
Matthias
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