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Old 7th February 2008, 02:17 AM   #1
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Default 12AX7 Preamp NOOB Question

Hey! I have my schematics and I have my parts list. I just don't know exactly what type/brand ect of these parts to buy or where to find them. I did find some "Audio Grade" Radial Caps on one site but trying to find the caps that match the project pic is killing me.

What are PC electrolytic caps? I still haven't figured that one out. I can find metallised polyester but there are so many different types. Radial, Epoxy coated, Shrink wrapped plastic, ect...

My main question is. Where can I find the correct parts for the project below.

Thanks,
Mace


Project picture and Schematic http://diyaudioprojects.com/Tubes/12...eamp/index.htm

Parts List
CAPACITORS
1 220uF 10/16v PC electrolytic
1 47uF 450v PC electrolytic
2 220nF (0.22uF) 630v metallised polyester (greencap)
1 100nF (0.1uF) 100v metallised polyester (greencap)
1 100nF (0.1uF) 630v (greencap)


RESISTORS (0.25wt 1% metal film )
3 1M
2 33k
2 100k 1wt carbon film
2 1k
1 8.2k
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Old 7th February 2008, 03:54 AM   #2
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Default Re: 12AX7 Preamp NOOB Question

Quote:
Originally posted by Mace_Hacker
Hey! I have my schematics and I have my parts list. I just don't know exactly what type/brand ect of these parts to buy or where to find them. I did find some "Audio Grade" Radial Caps on one site but trying to find the caps that match the project pic is killing me.
Don't worry about it.

Quote:
What are PC electrolytic caps?
Printed Circuit board mountable electrolytics. These have the two leads coming out of the same end, as opposed to coming out of each end (axial capacitors). This doesn't matter, since both types work just the same. For my projects, I use what's called a "modified dead bug" method of making the subsystem circuit boards. Onehelluvalot easier than a printed board, and easily amenable to parts on hand.

Quote:
I still haven't figured that one out. I can find metallised polyester but there are so many different types. Radial, Epoxy coated, Shrink wrapped plastic, ect...

My main question is. Where can I find the correct parts for the project below.
Again, this really isn't such a big concern. I prefer AuriCaps myself (it may be "overkill" in projects that use gNFB) Solens are also quite good. Polypropylene dielectrics are almost as distortion-free as free space. You can find perfectly good capacitors from the Mouser catalog. Since this project does incorporate gNFB, whatever errors that the more common polyesters may produce will be corrected by the negative feedback loop. There are lots worse contributions to inferior open loop design than capacitors. Of course, in a design that doesn't use gNFB, capacitor choice will make a bigger difference.
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Old 7th February 2008, 02:17 PM   #3
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Thank very much. That cleared up a lot of my concern.
As for the power supply, are there any places that sell dual output power supplies reasonably?

The one I seem to find would not work or are to costly. Building them seems to be my only option.
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