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Old 11th June 2013, 09:11 PM   #2311
potepuh is offline potepuh  Slovenia
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Thanks guys, the bulding continue
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Old 11th June 2013, 09:52 PM   #2312
flg is offline flg  United States
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Well, if you wanted them to be coupled together, that would be the best way
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Old 9th September 2013, 05:37 PM   #2313
crcook is offline crcook  United States
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New to the forum. Old tube amp builder and restorer Currently listing to Shannon's ST35 clone and a strange little class D amp that sounds remarkably good. Room limited, so running a pair of JBL 4406s. Looking to upgrade speakers soon, as the nest is empty in a week, second son off to college. Of course, that means little money for hobbies....

Anyway, I have always wanted to build a NP amp. Started on Zen amp 10 years ago, didn't get far and gave away PCBs to a friend. Looking at the F5, but worried about some parts in short supply.

Question for Nelson or other guru.

Is there a new version (F6?) on the way that sources available parts? I am a patient man, as I survived two teenage boys. Looking for 30 or so watts.

On a different topic, any opinions on Vandersteen 1B or 1C? I love the 2C, but not enough room now.

Thanks to all for any wisdom.
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Old 9th September 2013, 08:44 PM   #2314
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Spencer has the jfets you need for an F5. he is a known good source, unlike the majority of fakes on ebay. Check out here: FET Audio | Hi-End Audio Projects I can't tell you first hand how great an F5 is, since I'm still waiting on my boards, but the reviews are wonderful. I can't wait. F6 is a different animal.
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Old 9th September 2013, 09:57 PM   #2315
crcook is offline crcook  United States
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Default F5

Thanks Bob. I contacted Spencer. Am planning on ordering boardset from diy store. The case in the diyaudio store, the 4U looks good.

I have seen some cheaper ones on eBay from China. Somewhat smaller, not drilled of course. I wouldn't expect the quality of the Italian units. I have some metal skills and tools for measuring, drilling, etc. so am intrigued by the savings.

Any builders use eBay for cases? Any vendors recommended?

Thanks again.
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Old 9th September 2013, 10:42 PM   #2316
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For an earlier project I used a Chinese case though a group buy rather than an ebay seller. Packing left much to be desired, a couple of bent fins, flat panels scratched. Not that this means it's a problem with all Chinese sellers, just something to inquire about.

I contributed to the sellout of 4U cases at the store. There are some with blank rear panels still available. Part of the customization that was done for the DIY store cases was improved packaging. My cases arrived in pristine condition. Support your favorite website.
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Old 10th September 2013, 05:31 PM   #2317
crcook is offline crcook  United States
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One additional newbie question. I have a 16v x 2 transformer rated at about 300VA. With my elevated local AC line voltage, I estimate the output at the secondaries at 17 VAC. Is that one volt difference significant in the grand scale of things for an F5 amp? I wouldn't think so, but thought I would check.

Thanks in advance.
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Old 10th September 2013, 07:02 PM   #2318
Zen Mod is offline Zen Mod  Serbia
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just enjoy
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Old 10th September 2013, 11:43 PM   #2319
crcook is offline crcook  United States
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Default Transformer

I assume that means it is OK.

Sorry, I am new here and don't speak Zen

Thanks
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