How does this look for an initial BOM? This is just for stuff I plan to buy from digikey, so I left out C1, C8, and C10 so I can buy fancy audio caps from parts-express or something. I'm ordering LU1014's matched at 1.06 vds from Deep Surplus, so I chose 2 ohms for R5. I've already bought a toroidal transformer from Antek so I can cross that off my list too.
Blue Lander, the small MUR's are not enough to handle the inrush current.
If using those kind of buggers from Digikey, I would recommend.
DSEI30-10A-ND x 8. And heatsink them or tie to chassis.
The whole amp runs like a stove top.
If using those kind of buggers from Digikey, I would recommend.
DSEI30-10A-ND x 8. And heatsink them or tie to chassis.
The whole amp runs like a stove top.
Thanks Tea-Bag, I'll update the BOM. Maybe it'll be useful to some future amateur who wants to build an F3.
The Antek AN-4218 I ordered for the project just arrived. 400VA should be enough for an F3, right?
The Antek AN-4218 I ordered for the project just arrived. 400VA should be enough for an F3, right?
Sounded great on Altec A-7s as well. why in the world would you think the F-5 wouldnt be great with horns? I cant think of a reason. I understand you dont need the extra section, but then your back to "it may be too similar to the 45 SE" deal, no?
russellc
The f5 is definitely still in the running. if I was to build an f3, would I be able to repurpose the power supply circuit in an f5?
The F3 and F5 Power supply boards are identical, just jumpers are different.
The rest is Identical, including the heat sink and case requirements.
The rest is Identical, including the heat sink and case requirements.
I read some more f5 reviews, I think I might have written it off too soon because it's push pull. I read a few user reviews at 6moons and it sounds like it's very popular among SET lovers who want to play with transistors. I'm going to build the PSU and the transistors for both the f3 and f5 since they seem to be in short supply, and then decide at a later date.
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... to have as low distortion from the amp as possible and love to have a big bandwith.
Not knowing the F3 from own experience, but a lot of very fine tube amps.
The F5 is simply GREAT!
Franz
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Agreed! Although its interesting reading about F-4 also, the version that make 100 watts into 8 ohms has my attention, I just cant get my head around the notion that it doesnt have any gain? Does it drive things (powerwise) like any other 100 watt amp? Interesting, this whole line up.😕
Russellc
Yes, but obviously you need a preamp with gain.
You could also think of it like a 3 stage amplifier with source-follower push pull output (eg BA 2), but instead of it being in one box you put it in two boxes the first two stages are in the first box and source follower stage is in the second box.
You can also get 100W into 8Ohms with F5. You just need to cascode the input and obviously increase the voltage.
You could also think of it like a 3 stage amplifier with source-follower push pull output (eg BA 2), but instead of it being in one box you put it in two boxes the first two stages are in the first box and source follower stage is in the second box.
You can also get 100W into 8Ohms with F5. You just need to cascode the input and obviously increase the voltage.
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Is there any benefit to building the cascode version of the F5 if you don't need the extra wattage? I read Mr. Pass's article about the cascode, it sounds like it reduces distortion from voltage fluctuations.
try ;
then let your ears decide ;
that's what NP is keen to teach you , not to make blindly amp after amp
then let your ears decide ;
that's what NP is keen to teach you , not to make blindly amp after amp
Interesting. I'll read the Pass article on it and return. A 100 watt f-5...Hm.m.m.
Russellc
Click on the arrow in the quote.
You could try 40V rails or whatever your heatsinks can manage.
Where does one buy the LU1014 JFET for the F3?
I would also like to build a phono preamp, which design would fit in with a F3 and possible B1 passive preamp?
I would also like to build a phono preamp, which design would fit in with a F3 and possible B1 passive preamp?
Electronic Components
http://www.diyaudio.com/forums/pass-labs/156397-pearl-two.html
a couple of options
http://www.diyaudio.com/forums/pass-labs/156397-pearl-two.html
a couple of options
I am not so sure Deep Surplus doesn't charge a crazy amount for overseas shipping. I would check. That was an issue in the F3 thread I believe.
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