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View Full Version : Everybody loves a little Foreplay...



JimJ
04-23-2005, 12:02 PM
http://www.bottlehead.com/et/adobespc/foreplay/foreplay_line_stage_kit.htm

One of these, anyway! :up2somet:

My new line-level preamp arrived...dual 12AU7's, individual volume controls for each channel, solid-state rectification (will change that as soon as I get a circuit figured out) and various mods. Considering I got it for hundreds less than it usually sells for, it's a bargain :)

http://img228.echo.cx/img228/6119/foreplay18ka.jpg

http://img228.echo.cx/img228/4117/foreplay29mk.jpg

http://img231.echo.cx/img231/6461/foreplay32mn.jpg

oh my...are those electrolytic caps I see in the output section? Better not tell them they don't work :rolleyes:

Beat_Dominator
04-23-2005, 01:14 PM
Tubes are for nerds!

JimJ
04-23-2005, 07:23 PM
or people that like their music to sound good :D

:nerd:

azbass
04-23-2005, 09:33 PM
looks like a science project gone mad. i like :)

XtrmAudioCncpts
04-23-2005, 09:34 PM
jack what are you using that for?

PV Audio
04-23-2005, 09:36 PM
jack what are you using that for?
an amplifier??? :eek: :eek:

XtrmAudioCncpts
04-23-2005, 09:40 PM
an amplifier??? :eek: :eek:
i know what it is and what its for i was curious what he was using it on

JimJ
04-24-2005, 01:16 AM
Like my sig doesn't say :)

A Decware SE84CS single-ended triode power amp...

LoudCrownVic
04-25-2005, 08:53 AM
I've heard that tube amps put out a suprising amount of power. I met a guy in a pawnshop who used a 3 watt tube amp to power a 500 watt pioneer sub and it slammed real hard without blowing the speaker... Although I have nihl of my own experience.

Always curious about new ways to make noise- or in the case of your amp that you just built music....

monte_carlo97
04-25-2005, 09:03 AM
tube amps are just amazing they are just really expensive.

req
04-25-2005, 09:44 AM
so jack, where are the schematics so i can build one for myself?

i could put that together if you gimme the product list ;)

i got a pair of folded horn boxes to make for a pair of radioshack speakers and i need an amp for them ;)

JimJ
04-25-2005, 10:20 AM
tube amps are just amazing they are just really expensive.

If you look at dollars/watt, yeah they are...but overall, they're not too bad. You could easily spend much more on a solid-state setup.

monte_carlo97
04-25-2005, 12:28 PM
so jack, where are the schematics so i can build one for myself?

i could put that together if you gimme the product list ;)

i got a pair of folded horn boxes to make for a pair of radioshack speakers and i need an amp for them ;)
i wouldn't mind having the schematics either. Would make for a nice summer project.

JimJ
04-25-2005, 02:20 PM
You guys tell me this after I leave home with my copy machines ;)

Alright, I guess I'll borrow my roommate's...I've got the schematics, parts layout and lists, and stuff like that.

monte_carlo97
04-25-2005, 02:42 PM
sweet that would be awesome.
Also do you hapen to have a place to get the tube capacitors from for cheap.

JimJ
04-25-2005, 04:41 PM
Tube capacitors?

req
04-25-2005, 05:54 PM
lol. i dont believe there is a 'cheap' way to get these parts, or else they would be 'cheap' to buy :)

but ill take a looksee and find if i can get anything. cuz i got some schematics on a nice 6' pair of folded horns for a pair of 6.5's that im itching to build and i have no amplification for them :D

JimJ
04-25-2005, 05:57 PM
I still have no idea what a "tube" capacitor is :)

You mean an electrolytic cap?

JimJ
04-25-2005, 05:59 PM
And Req - remember, this is only a preamp, not something that will power your main speakers :) You need a power amp for that...

monte_carlo97
04-25-2005, 06:19 PM
tube capacitor

http://www.oksolar.com/images/electronics_tube.gif

is that not what they are called. At least that is what i thought there were.
If that is now what they are called then what is the large glass cylinders on your preamp.

JimJ
04-25-2005, 07:13 PM
Vacuum tubes...they're not capacitors at all :)

Learn: http://www.vacuumtubes.net/How_Vacuum_Tubes_Work.htm

PV Audio
04-25-2005, 08:38 PM
Vacuum tubes...they're not capacitors at all :)

Learn: http://www.vacuumtubes.net/How_Vacuum_Tubes_Work.htm
lol tube capacitors, but yes tubes can get expensive if u don't know wtf ur doing...and they are horrendously innefficent unless ur running a low power requiring setup (folded horn, TL)

monte_carlo97
04-25-2005, 10:42 PM
Vacuum tubes...they're not capacitors at all :)

Learn: http://www.vacuumtubes.net/How_Vacuum_Tubes_Work.htm
yea that is what i meant. I don't know why i was thinking tub capacitors.