Quickie C1 . . ?

the dude · 5094

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Offline the dude

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on: January 04, 2012, 08:20:32 AM
Iv'e had this since Halloween, its fabulous!
I was playing with OPA's and LM's before these, no more!  HOOKED!
Anyway, the Carver preamp gave me some trouble, again, so I decided to make a small modification...
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi258.photobucket.com%2Falbums%2Fhh251%2Fpaulpatrick3%2FquickieC1.jpg&hash=1be61e82a9877f0aabbbeb53be4b7cd4a6cf1a79)

BEST mod done to this unit, hands-down.

Maker of fine true ribbon loudspeakers and modifier of everything. . .

Offline Grainger49

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Reply #1 on: January 04, 2012, 08:48:23 AM
LAMO!  Very well put.


Offline porcupunctis

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Reply #2 on: January 04, 2012, 04:03:19 PM
Dude!  I can't tell you how many times I've considered building a quickie into one of my Phase Linear (pre-carver, carver) pre-amps.  Before I got into Bottlehead stuff I accumulated a bunch of PL SS equipment and kept running into equipment problems.  The biggest problem being that the ICs for the preamps are no longer manufactured and don't have a modern pinout so replacing is not a good option.

I love the looks of this stuff but I just can't get any of them running well for any length of time.  I might have to put this idea back on my project list now.

Thanks for sharing, nice work.

Randall Massey
Teacher of Mathematics
Lifetime audio-electronics junkie

Offline the dude

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Reply #3 on: January 05, 2012, 07:03:35 AM
Your'e welcome and thanks!
The Joppa board is underneath BTW.
It [Quickie] currently uses the volume balance and power controls.
Next I think I will integrate an electronic crossover I have, it may well get the tube treatment before that.
The Quickie alone [no process] has more stage than the C1 did with all of the holography circuits engaged.
Strangely accurate at the same time... I can't wait to see what BugleBoy tubes do with this thing!

Maker of fine true ribbon loudspeakers and modifier of everything. . .

Offline the dude

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Reply #4 on: January 10, 2012, 05:09:44 AM
Iv'e used an hp printer power cube and parallel 63v 1000uf fc cap in replacement of the 9v batteries with fair success FWIW.

Maker of fine true ribbon loudspeakers and modifier of everything. . .

Offline the dude

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Reply #5 on: January 10, 2012, 09:02:53 AM
there was some audible noise without the cap.
with the cap its there but not discernible with audio output, only in silence.
I was thinking 2 more in series with + and - wire might be worth trying for giggles...
There is definitely noise though...

Maker of fine true ribbon loudspeakers and modifier of everything. . .

Offline the dude

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Reply #6 on: January 10, 2012, 09:05:13 AM

Maker of fine true ribbon loudspeakers and modifier of everything. . .

Offline Doc B.

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Reply #7 on: January 10, 2012, 09:08:16 AM
You might just try a film cap in parallel with the existing 1000uF, maybe a 1uF or a .1uF. Might shunt more HF noise to ground.

Dan "Doc B." Schmalle
Former President For Life
Bottlehead Corp.

Offline the dude

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Reply #8 on: January 19, 2012, 07:23:21 PM
.1uf cap, check. I also found that a piece of copper tape helped strung from tops of tubes to chassis helped with noise.
Microphonics worse with a DC converter?

Maker of fine true ribbon loudspeakers and modifier of everything. . .

Offline Doc B.

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Reply #9 on: January 20, 2012, 06:21:13 AM
The microphonics might be worse with a DC converter simply because you don't have the additional mass of the batteries attached to the chassis plate.

Dan "Doc B." Schmalle
Former President For Life
Bottlehead Corp.

Offline the dude

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Reply #10 on: January 20, 2012, 11:38:02 AM
LOL I bet that's what it is!

Maker of fine true ribbon loudspeakers and modifier of everything. . .

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