Quickie C1 . . ?

[the dude]

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...

BEST mod done to this unit, hands-down.

 

[Grainger49]

LAMO!  Very well put.

 

[randy@matrixq.com]

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.

 

[the dude]

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!

 

[the dude]

Iv'e used an hp printer power cube and parallel 63v 1000uf fc cap in replacement of the 9v batteries with fair success FWIW.

 

[the dude]

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...

 

[the dude]

or maybe :
http://sound.westhost.com/project43.htm

 

[Doc B]

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.

 

[the dude]

.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?

 

[Doc B]

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.

 

[the dude]

LOL I bet that's what it is!