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Old 17th August 2007, 03:06 PM   #1041
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Default Indeed just a first impression

There'll be lots more I'm afraid (for those who hate long reviews).

With 18-20dB preamps and 2V sources, I've already determined that in my digs, a 91dB speaker is about the limit to have sufficient gain with one stereo F4 also for the audiophile albums that ain't compressed to hell and thus sport a lower median level.

One of my sources can output up to 7V and I've got speakers all the way down to 82.5dB/4 ohms. My most buxom preamp generates 26dB in its highest setting. Once F4 #2 shows up (the shipper returned it to Pass Labs for no good reason so Nelson had to fire it off to Cyprus again), I'll explore some figures of "speaker sensitivity + preamp gain = x setting on the volume with 1 or 2 F4s".

After that, it's massive preamp swapping to see how that affects sonics and feel.

After that, i'ts buffer follower with my 2wpc Yamamoto A-08S and 4-watt Fi 2A3 monos.

Sorry, it'll be looong
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Old 17th August 2007, 03:50 PM   #1042
eLarson is offline eLarson  United States
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No trouble at all. Take your time and enjoy it.
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Old 17th August 2007, 04:41 PM   #1043
Studley is offline Studley  United Kingdom
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Default Supratek Cabernet

Srajan
this may be premature but I've already decided that the Cabernet preamp + a pair of F4s should produce sonic Nirvana. Be sure to try yours with the F4s - I'm sure you are planning to - yes?

Ian
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Old 17th August 2007, 06:07 PM   #1044
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Default Yes on Cabernet Dual

Mick's nearly done with the upgrade to full 101D/6H30 status which makes my Cab Dual now identical to what's sold presently - mine didn't have the 6H30s and Mick finally convinced me to return the beast to Oz. I'd been so happy, I didn't want to be without it. Once he got it back, he essentially said, "Boy, that's *old* - we've come a long way since, you won't believe the difference."

O-kay, I'm ready to believe. Soon, I take it.

And absoloodely, the Supra and F4 will be the real highlight, I predict. First, the Supra even before the mod was the best pre I've ever heard (not that I've heard all but it's baaad). Second, it's got mondo gain. Put the two together, add the F4 aftern for a hybrid tube front end, transistor tail end three-box amplifier (the Supra's got an outboard tube-rectified, tube regulated power supply) and this combo should drive speakers in the 87-88dB range fine, I'd expect. Perhaps just a skoch lower even in my room.

Then add a second F4 (the Supra's got transformer-coupled true balanced outs), get 100 Nelson watts for current and drive and who knows, mebbe even the very inefficient M&D Rubys and Maximus Monitors can join the party.

Right now they're hanging off 900 watts into 4 ohms of Coda juice and liking it so this will be a real test for the F4 concept (not that it's a really sane proposition but hell, trying doesn't hurt).

Right now things are sounding so good, I'm not that curious anymore to hang the F4 off the Yamamoto. I'll do it, never fear - but for the moment, the old itch for 45s is curiously absent.
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Old 17th August 2007, 08:19 PM   #1045
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Srajan,

Welcomed to DIYaudio. Great to see you have join this thread. I always enjoy your reviews at 6moons especially when you do equipment from designers I know.

Keep up those excellent reviews… looking forward to read about the next installment of the F4 saga.

Best regards
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Old 17th August 2007, 09:47 PM   #1046
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Srajan is still waiting for his second F4 so that he can try the mono configurations.

Unfortunately only one of the two that I shipped got through.

Fortunately the second unit bounced back to me, so we'll try again.

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Old 18th August 2007, 06:55 AM   #1047
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Nelson Pass
Srajan is still waiting for his second F4 so that he can try the mono configurations.

Unfortunately only one of the two that I shipped got through.

Fortunately the second unit bounced back to me, so we'll try again.

next time feel free to write mine as bouncing address



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Old 20th August 2007, 03:19 AM   #1048
jleaman is offline jleaman  Belgium
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Thought i would post a picture of my chassis for my F4.
Attached Images
File Type: jpg f4-heatsinks.jpg (89.2 KB, 1084 views)
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Old 20th August 2007, 03:07 PM   #1049
eLarson is offline eLarson  United States
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Looks nice and sturdy.
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Old 20th August 2007, 04:16 PM   #1050
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has anyone gotten thier F4 up and running using Peter Daniel's PSU boards? Just curious which final configuration you settled on...
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