http://cvd.scorpiorising.ca/kits.html

--
Sander deWaal
"SOA of a KT88? Sufficient."

Sander deWaal wrote in message . ..
http://cvd.scorpiorising.ca/kits.html

You get me all excited and then I see the input requirements for the
power supply. 300 to 380 filter DC. What the hell is that? I need a
design that runs off 110VAC. With this I need a supply to supply the
supply

But the preamp schematic and CCA is very cool. Citation 1 may be
coming in a week or 2 though. I'm excited.

I been reading the tube book. The good news is, I've found a sure cure
for insomnia. Bad news is... my attention span is even less than when
I was in college..... I miss my reel to reel (which some ass saw fit
to steal out of my dorm room) when I could spool up about 8 hours of
my favorites.

Ordered some Arulex wedgies from the Guitar Center. They're cheap. I'm
gonna rig them behind the Quads to see I can absorb/diffuse the back
wave and see what it might do for imaging. I was getting annoyed that
the image on some music seemed to be shifted left and discovered if I
closed the door (which is in the corner sort of behind the right
speaker) it centered up better. But my Checky test CD (with some guy
speaking from multiple positions) seems pretty centered regardless of
the door, I think that voice lacks high freq content so it doesn't get
impacted by the back wave so much.

ScottW

(ScottW) said:

http://cvd.scorpiorising.ca/kits.html

You get me all excited and then I see the input requirements for the
power supply. 300 to 380 filter DC. What the hell is that? I need a
design that runs off 110VAC. With this I need a supply to supply the
supply

The supply PCB is just an adjustable voltage stabilizer.
You need to have a HV tranny (270.........300V will suffice), two 22
ohms/1W resistors feeding a bridge( 4 x 1N4007 or soft-recovery
types), and a smoothing cap (220 uF/450V) to go with it.
Put 10 nF/1000V caps over the diodes as snubbers.
Oh, and a heater transformer 6.3 Vac or 8...10V ac if you want to use
regulated DC on your tube's heater (recommended in a preamp!).

Even better: 270-0-270 tranny---EZ81 tube rectifier ---PP or BG
10uf/400V---10 H/100 mA choke---(insert favourite cap here, Black
Gate WKZ 100uF/400V or PP 47uF/400V, or higher values).
You can even split up the supply after the first filter cap for both
channels if you like.
You can adjust the voltage a bit with the value of the first filter
cap. This way, you don't need the regulated supply PCB.
If necessary, you can put a resistor in series in the choke circuit
for more voltage drop, or use a lower voltage transformer.

The designer of the kits assumes that there's already a HV source
available. Search on the net for deals, a suitable tranny can be had
for $10...20. It needs to deliver 100 mA at most, while the heater
winding should be ready for say 2.5 amps when using the tube recifier.
The EZ 81 runs on the same heater voltage as the other tubes, it can
withstand a Vk-f of 500 volts!

I'd like to ship you a tranny, but that won't be of any use to you.
The shipping costs will be more than the value of it, and the mains
voltage is mostly 230V on my junkbox transformers.

A shame, really. I have collected more tube stuff than I ever will use
in my entire life..........
--
The opposite of a correct statement is a false statement. But the
opposite of a profound truth may well be another profound truth.
- Niels Bohr