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F5 v2.0

Do you have the meters off yet? Heh, probably spinning some tunes and kicking back.:D

Yeah, those little "character" discoveries are cool. I took down an outhouse on my property that had a carved date, "05-30-09". We tore it down 90 years later, to the date.:yes:
What was even more interesting was the realization that all those stenciled numbers on the framing of the house meant that we were living in a kit house. We discovered that when I tore out all the lath and plaster.

PM responded to about metal fabbing.
 
Looks great Spec. What are the little square things the blue and green wires from the PTX go into? Do the signal path board just hang out in space or do they get mounted to something? Pix of the outside???
 
westend said:
Do you have the meters off yet? Heh, probably spinning some tunes and kicking back.:D

PM responded to about metal fabbing.
Click to expand...

Nope I'm at my daughter's volleyball tourney. Check my thread in the photography forum.

Got your PM. I'll be where ever you need me to be this week. Next week I'm traveling to Denver.

djnagle said:
Looks great Spec. What are the little square things the blue and green wires from the PTX go into? Do the signal path board just hang out in space or do they get mounted to something? Pix of the outside???
Click to expand...

Those are the rectifiers for positive and negative DC. And yeah the boards just hang there. They don't weigh a thing.

More later when I don't have to type On a phone. :)
 
golana said:
Man, that looks good. Anything special, for the face plate?
Click to expand...

You can seen the original build thread in my sig, the face plate is plain gold anodized. I've thought of taking it to an engraver but in truth it just sits under my desk so why bother.

Pics from build 1.0, same chassis

done6.jpg

done1.jpg
 
OK, it powered up like a champ, both boards are set to .500v across r11/r12 with minimal dc offset at the outputs. I'll let it warm up for a couple of hours and dial it in.

More later!

f5e.jpg
 
Ah, the same chassis. Makes for a better understanding.:thmbsp:
I do read entire threads. Only after a week or so, my mind wanders a bit.
 
Well it tweaked right in, I'm running 590mv across each measuring point with 5 and 7 mv for DC offset.

Hopefully some critical listening tomorrow.
 
It only took six weeks, but F5 2.0 is now "in system". Actually I lent it to numbdiver for an extended listen and break in period. I got it back a week or so ago, and just tonight had the drive to reconfigure my space.

Ah, the F5 sound..... I enjoyed my time with my HF-81 but this is.... better. These amps sure are quick on their feet, no coloration at all. Just freakin' beautiful.
 
specialidiot said:
It only took six weeks, but F5 2.0 is now "in system". Actually I lent it to numbdiver for an extended listen and break in period. I got it back a week or so ago, and just tonight had the drive to reconfigure my space.

Ah, the F5 sound..... I enjoyed my time with my HF-81 but this is.... better. These amps sure are quick on their feet, no coloration at all. Just freakin' beautiful.
Click to expand...
Quick and mellow is my take, I've had some good amps but there seemed to be a little "glare" or "hardness" about some of them. Nonexistent with the F5. I'm listening to mine right now on the Altec horns and it is a beautiful deal. Nelson's reasoning on the "first watt" seems to be spot on.
 
Where is the Ray build?

I have to agree with you two fellows. Driving the single driver Jordans, bass is amazingly strong and the rest is well mellow. Love it.
 
ejfud said:
Where is the Ray build?

I have to agree with you two fellows. Driving the single driver Jordans, bass is amazingly strong and the rest is well mellow. Love it.
Click to expand...

Hey. My amp gets done first!!! ;)

Ray's is all done, just waiting on the top and rear panels from the powder coater. He's reshooting the top - he wasn't happy with his first effort
 
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Special,
Have you considered building it without the current limiting circuit?
I made mine minus the curent limiting. It's supppsed to sound even better.
Also, I'm going to swap out r9,13,14 with vishay nudes
Supposed to make it sound less clinical. ill report back when I get the vishays in. In a month.
 
dazed1 said:
Special,
Have you considered building it without the current limiting circuit?
I made mine minus the curent limiting. It's supppsed to sound even better.
Also, I'm going to swap out r9,13,14 with vishay nudes
Supposed to make it sound less clinical. ill report back when I get the vishays in. In a month.
Click to expand...

I've heard of the current limit mod, but I don't know if the risks are worth it. The Vishay resistors do interest me though.
 
The trouble with running a class A in a small upstairs room is that it gets mighty warm in here around July. I had to take the F5 out of my office system due to the heat - for sure my heat sinks were hotter than usual, I could just bare to hang on to it long enough to carry it out to the hallway. So I'll pop the top and check things out while I'm at it.

In its place I put in my Yamaha PC2002M, yeah I think I have enough power. This Yammie is a great sounding amp, but it doesn't have the bass of the F5. Mids and uppers are a tad tighter but I'm missing the liquid goodness.
 
I know what you mean about the tube comparo.....I also sold my Mc 225 after experiencing the F-5. I havent looked at a tube in months. do especially like the tube front end, AVA Super Pas III with the
f-5.:yes:

Russellc
 
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