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Old 16th June 2010, 12:27 AM   #1
jrubins is offline jrubins  United States
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Cool First Watt kits? Projects?

Hi there!
So, I'm looking at building an amp (and maybe a preamp) in the near future.
The ideal thing would be a Single Ended Transistor (SETr anyone?). The closest thing I've seen are Nelson Pass' designs.
I really like the look of the First Watt F2.

Is this available as a kit? Is there a project page somewhere describing how to build my own? Or is this just a commercial venture for Mr. Pass, and I will have to look elsewhere for a design?

I like the Zen designs Mr. Pass has come out with in years past, but I don't know how up-to-date the designs, parts lists, etc are.

Any help out there on making a decision?

I'd like a kit because I don't have the facility to make my own circuit boards. But if wiring is simple enough, the point-to-point soldering isn't out of the question.

Thanks all
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Old 16th June 2010, 12:28 AM   #2
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FIRST WATT HOME

Look at the articles and product manuals.

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Old 16th June 2010, 02:32 PM   #3
jrubins is offline jrubins  United States
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Forgive my ignorance grand poo-bah of solder slinging!
As Bono says "I still haven't found what I'm looking for"

Maybe I'm just looking wrong

The ideal thing would be a kit... or at least a printed circuit board...or a point-to-point wireable set up that I can build in a weekend.

I've looked at the product manuals for the First Watt products, and they mostly seem to be just that, manuals. The passdiy.com stuff seems to be a bit on the more complicated side with words like "balanced" and "feedback" :P

but then again, perhaps I just haven't turned over the right rock?

Thanks for your help, Poo-bah Pass
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Old 16th June 2010, 03:02 PM   #4
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Search harder at ebay.

You can find some Pass designs , but not all, Unfortunately all of them just stole Mr. Pass' Intellectual properties.

Viola! I already found one already, Not f2 though. Famous Pass F1 Class A AMP clone KIT ?Sound Warm - eBay (item 180509331254 end time Jun-17-10 08:38:19 PDT)

Last edited by marchel; 16th June 2010 at 03:07 PM.
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Old 16th June 2010, 03:17 PM   #5
DougL is offline DougL  United States
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Quote:
Originally Posted by jrubins View Post
Forgive my ignorance grand poo-bah of solder slinging!
As Bono says "I still haven't found what I'm looking for"

Maybe I'm just looking wrong

The ideal thing would be a kit... or at least a printed circuit board...or a point-to-point wireable set up that I can build in a weekend.

I've looked at the product manuals for the First Watt products, and they mostly seem to be just that, manuals. The passdiy.com stuff seems to be a bit on the more complicated side with words like "balanced" and "feedback" :P

but then again, perhaps I just haven't turned over the right rock?

Thanks for your help, Poo-bah Pass
The only official circuit board is the B1. It can be found on the PassDIY site.

However, there are group buy circuit boards for F3, F4 and F5.
F5 pcb group buy...
Gb: F5 Pcb
Gb: F4 pcb

Any of the Firstwatt amps should be simple enough to build point to point.

Good luck with your build.

Doug
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Last edited by DougL; 16th June 2010 at 03:23 PM.
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Old 16th June 2010, 03:21 PM   #6
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F2 boards are available here: F2 pcb group buy...
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Old 16th June 2010, 04:36 PM   #7
jrubins is offline jrubins  United States
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Quote:
Originally Posted by marchel View Post
Search harder at ebay.

You can find some Pass designs , but not all, Unfortunately all of them just stole Mr. Pass' Intellectual properties.

Viola! I already found one already, Not f2 though. Famous Pass F1 Class A AMP clone KIT ?Sound Warm - eBay (item 180509331254 end time Jun-17-10 08:38:19 PDT)
Lol! What's funny is that I work at ebay, and I couldn't find any first watt designs! Le Sigh. Guess I'll have to work on that

I'm not too hot on the "stole Mr. Pass' intellectual property" part either.

That F2 group buy might be just the ticket.
Peter, you got any of those left?

How hard would it be to use a Jfet in the F2?

I also noticed no f3 pcbs hanging about. Is it not as well loved a design?

Thanks for the info, all
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Old 16th June 2010, 04:46 PM   #8
DougL is offline DougL  United States
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There was at least 1 group buy for each. Here is the first F3 group buy I found.
I just Broused the group buy forum and found things on the first 4 pages.

Re-Issue GB for F1 / F3 / F5

Doug
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Old 16th June 2010, 04:47 PM   #9
jrubins is offline jrubins  United States
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Perhaps another question to ask:
If you were building a first amp, had efficient loudspeakers, like 'tube sound' but hated 'fussiness'... what would you build?
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Old 16th June 2010, 04:48 PM   #10
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Quote:
Originally Posted by jrubins View Post
That F2 group buy might be just the ticket.
Peter, you got any of those left?
I still have plenty of them available
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