Let me lite fire - Nelson Pass F1

[Nelson Pass]

I'm so pleased.

I played with the J-Lows for nearly a year, but I always have
to make room. The El Pipe-O's and Kleinhorns were donated to
an artists colony in Oakland, where I hope they will all be happy.

In point of fact I am always on the lookout for worthy recipients
of old projects (read: speakers, amplifiers and parts), but it is
difficult to find victims. I inveigled Wayne into taking the J-Lows.

 

[Dennis Hui]

JH,

Your J-Lows looks great... Congratulation!

Love that funky name plate design.

Cheers,
Dennis

 

[GRollins]

And where, pray tell, is the sign-up list for prospective 'victims' to be found?

Grey

 

[metalman]

jh6 you,

Another fabulous project completed. Congratulations, I am jealous and now have another future project to add to the ever growing list.

Nelson,

What Grey said ... me too!

 

[Stones]

I'm so pleased.

In point of fact I am always on the lookout for worthy recipients
of old projects (read: speakers, amplifiers and parts), but it is
difficult to find victims. I inveigled Wayne into taking the J-Lows.

One man’s hell is another man’s heaven.
Replace hell with victim and heaven with well heaven

 

[jh6you]

Thanks, Dennis and metalman.


After a short dinner, I tried several different single pole high pass filters, and I settled down with the filter of 0.1uF+17.5K at 90Hz.

Only two hour listening tonight . . .
Crystal Gale and Pink Floyd.


Regards
jH

 

[jh6you]

victims

I do not forget to say at the end, "If your wife complains, put it all on me."

Regards
jH

 

[jh6you]

This man looks somewhat drunk and tired . . .
and shy . . .

 

[Netlist]

To me he looks happy.

Great job, JH
Say, how many diy amps and speakers do you own at the moment? Must be a lot.

/Hugo

 

[jacco vermeulen]

and shy

Your posts read all but shy, JH6You.
Looks lovely, jh6you can do my furniture any day.
Very interested in hearing the end-verdict, JH.

 

[Nelson Pass]

And where, pray tell, is the sign-up list for prospective 'victims' to be found?

Cyclotronguy mediates requests.

 

[Blues]

Cyclotronguy mediates requests.

Nelson, Cyclotronguy...please^3 put me on the list.

 

[moe29]

jH!

Great work

(as usual)

thanks for posting pictures... it's always great to see your results.



m.

 

[george a]

Hi All

pardon my ignorance

How would an F1 perform as the amp driving a ribbon tweeter that has no matching transformer ?? ie: effectively into a near dead short?
I suspect it would make a fine tweeter amp in its own right.

A silly question to ask and I'm just the person to do it.

Cheers

 

[Variac]

In Nelson's write up about the amp he mentions that the first thing he tried the idea on was a ribbon tweetrer- it worked great and inspired him to try it with other drivers.. I can't remember if it had the transformer or not, but since I have ribbon tweeters I'm VERY interested!!

 

[Nelson Pass]

The F1 does not possess the gain or current capacity to do a
good job with the transformerless ribbons that I have seen.
There would be no reason you couldn't build a much bigger one,
but I'm not likely to be the one doing it.

 

[jh6you]

Kept smile on my face all day. . .
Looking at the small belly buttons on big J-Low bodies . . . smiling . . .
And, I visited the 6 moons F2 review . . .
Reading there about the 2nd and 3rd harmonics commented by the critics, and reading the same things commented by the master . . . smiling . . .

At first, the big J-low horns had monotonic look.
But, with few flowers on the shelf in the upper mouth,
the big bodies started to change into nice figures . . .


------

End-verdict? Still I have way to go further.

I’m experimenting subtle changes of the acoustical low pass filter (stuffing the chambers) and the elec. single pole high pass filter, expecting these subtle changes would soon converge under a better destination.

Now, I’m staying at the single pole high pass filter of 0.1uF+20k R at 80Hz. And, for the acoustical low pass filter, I replaced most part of the sheep wool stuff with the polyester equivalent. How much? I bought two 50cmx50cm inner-cushion polyesters from Ikea. I used 75% of them each (additionally to the remaining wool stuff).

Listening to Best *audiophile* Voices, which I bought by chance, Mmmmmmm . . .
Very good recording . . . and nice 15 songs . . . all 15 songs . . .

Regards
jH

 

[jh6you]

And, for the acoustical low pass filter, I replaced most part of the sheep wool stuff with the polyester equivalent. How much? I bought two 50cmx50cm inner-cushion polyesters from Ikea. I used 75% of them each (additionally to the remaining wool stuff).

was meaning this.

Regards
jH

 

[jh6you]

I bought two 50cmx50cm inner-cushion polyesters from Ikea. I used 75% of them each (additionally to the remaining wool stuff).

Leftover.


Regards
jH

 

[jh6you]

Giulietta Simionato

And, the eye-catching comment: "This record should be played only on equipment specifically designd . . ."

Great operatic recital . . .


Regards
jH