First build---a Tube Cricket

[takamineman]

So I've decided a Tube Cricket is what I want to build for my first build.  The schematic is fairly clear with the exception of two things:
What do the Vcc and Vin symbols stand for? I know it's pbly something that should be obvious but I'm making sure I know what everything means before I start.  Here is the link for reference.
http://www.beavisaudio.com/projects/TubeCricket/
Thanks!

[duck_arse]

"Vin" is the supply input, which will supply the heavy current for the valve heater and the power amp. "Vcc" is a filtered positive supply for the valve to do clean audio with. Vcc usually indicates the presence of transistor collectors, so is perhaps misnamed here. Vin usually refers to the input signal, so is also probably misnamed. and they have confused you, which also points to misnaming.

just connect the points Vin to each other, and the points Vcc to each other. good luck.

[takamineman]

So the Vin from the power supply connects to the Vin on Tube stage 1, and the Vcc coming from pin 6 of the tube connects directly to the Vcc from pin 1 of the tube?
Sorry I'm a rookie 
Greg

[duck_arse]

exactamundo. you'll see drawing shortcuts like these, and especially Vref, all over the place. it saves miles of overlapping lines driving us all blind.

[takamineman]

Those two vcc points are essentially the same wire, just splitting off and connecting to two different pins.  Basically these two stages are just a copy of each other, with one loop going to the tone pot and one going to the volume pot?

[mth5044]

Yep, all the Vcc's connect together and all the Vin's connect together. They are like that so the schematic is a confusing spaghetti plate connecting all the stuff together from the power supply part.

[PRR]

"12vDC+" is from your power pack.

"Vin" is dirty 11.5-volt power. The tube heater and the power-amp chip eat this.

"Vcc" is clean 11.4V power. The tube plates eat this (via their trimmers).

Concept: you have a dirty well. You need a lot of water to wash your elephant and a little water to wash your baby. You need filtering. But filters cost money. Elephant-wash  needs a lot of water but just needs a rock-screen (here just C3). Baby-wash is much less water but needs a good 2-stage filter (here R2 C1 R3 C2).

I'm confused too. "Vcc" is old shorthand from *transistor* circuits, Collector power. But no collectors here. "Vin" makes me think of *audio* input, but that's called "Input" (logically). If using old-old shorthand, why not the old-old-old shorthand "B+" for plate supply? And digging even further into history, "A+" IS the classic connection for filament (heater) power. Including a bias battery you had A B and C batteries on your 1927 radio.

[tubegeek]

Including a bias battery you had A B and C batteries on your 1927 radio.

Atwater-Kent is the brand for me. I actually owned one for a while until I found a radio collector who needed some of the ancient parts. Cool gear - mine was mains-powered and a little later thgan '27 I think, but I still have the Arcturus blue-glass globe 27's I pulled from it somewhere, complete with their labels from the store that tested and sold them. I tried to make a line stage but I didn't get a decent sound from the filament-bias circuit I was trying to use. Maybe one of these days I'll try them again in a les experimental type of circuit. Gorgeous tubes. Cool radio, too.