80 STAGES OF 12AX7 TUBE GAIN BROoTaLitY - Harmony Central Musician Community Forums

Roccaforte Amps · 01-27-2008, 05:53 PM

Just finished this.
40 12AX7's, 80ma of high voltage, and 12amps of heater current
and you get 80 stages of gain!
My camera is bending the pics a bit, but here you go;

This is actually a preamp tube aging/burn-in rack
I just built for Dougs Tubes.
He'll be offering higher quality 12AX7's from now
on. Putting time on the tubes before you get them
does two things. One, insures you don't get any
premature failures, and two it also burns off
some of the nastyness/trebble associated
with brand new preamp tubes.
An incredible amount of work, 40 sockets, 80 mounting holes,
9 pins each, two resistors each, and all of their connections.
Doug

Say Ocean · 01-27-2008, 05:55 PM

Wow.

17 Tubes · 01-27-2008, 05:55 PM

LOL....you're not shittin us?

It LOOKS real.

Oops..just scrolled down...

me=pwnt!

Cool though. Burn in.

Bumble · 01-27-2008, 05:57 PM

At first I was thinking....."What the fuck, he really built this POS?"

But then came the truth.

Mr_GoodBomb · 01-27-2008, 05:59 PM

40 tubes, 15 bucks each... Have fun.

Rampage · 01-27-2008, 05:59 PM

That is intense! Looks like Doug's Tubes will take another step infront of the competition.

I am surprised the chassis can handle that many sockets too.

Rich · 01-27-2008, 05:59 PM

Quote:

Originally Posted by Roccaforte Amps

You need to build several of those and send them out to the douchbags tube dealers that ship those so called "Matched sets" of powertubes that are way off.

chrispsullivan · 01-27-2008, 06:00 PM

that just looks like an awful lot of work

Say Ocean · 01-27-2008, 06:01 PM

Quote:

Originally Posted by Mr_GoodBomb

40 tubes, 15 bucks each... Have fun.

Did you read the bottom part

Roccaforte Amps · 01-27-2008, 06:04 PM

Quote:

Originally Posted by chrispsullivan

that just looks like an awful lot of work

Do the math:

40 socket holes I cut
80 mounting holes
another 12 misc.
90 screws
90 washers
90 nuts
9 solder lugs per socket
2 resistors per socket
all the buss wire

chrispsullivan · 01-27-2008, 06:05 PM

Quote:

Originally Posted by Roccaforte Amps

Do the math:

40 socket holes I cut
80 mounting holes
another 12 misc.
90 screws
90 washers
90 nuts
9 solder lugs per socket
2 resistors per socket
all the buss wire

i remember seeing the unfinished product a while ago
how many hours do you think you put into it?

Kelly · 01-27-2008, 06:07 PM

Where's the booby knobs? I feel for ya drilling all those holes. I get to spend the week building 34 solid walnut drawers, all with dowels to hold wine bottles, for some Terlato wine disply in NYC scheduled for March. Ugh.

metalfanat1c · 01-27-2008, 06:08 PM

That's overkill even for using to burn in tubes.

Although I can only IMAGINE how much of a BEAST of a metal amp something like that would be... even if it cost $1000 to retube it.

Roccaforte Amps · 01-27-2008, 06:08 PM

Quote:

Originally Posted by Kelly

Where's the booby knobs? I feel for ya drilling all those holes. I get to spend the week building 34 solid walnut drawers, all with dowels to hold wine bottles, for some Terlato wine disply in NYC scheduled for March. Ugh.

woods not bad. I don't have a press here so it was all hand drill.
I was pretty beat after that.
The last time I built one of these it was a 100 tube unit.
I wish I had pics of that one, it was crazy when it was loaded
with tubes.

Kitarist · 01-27-2008, 06:10 PM

woooooow

thenakedarab · 01-27-2008, 06:10 PM

Quote:

Originally Posted by Roccaforte Amps

Just finished this.
40 12AX7's, 80ma of high voltage, and 12amps of heater current
and you get 80 stages of gain!
My camera is bending the pics a bit, but here you go;

This is actually a preamp tube aging/burn-in rack
I just built for Dougs Tubes.
He'll be offering higher quality 12AX7's from now
on. Putting time on the tubes before you get them
does two things. One, insures you don't get any
premature failures, and two it also burns off
some of the nastyness/trebble associated
with brand new preamp tubes.
An incredible amount of work, 40 sockets, 80 mounting holes,
9 pins each, two resistors each, and all of their connections.
Doug

Our amps and ears will thank you and Doug for years to come kind sir.

Roccaforte Amps · 01-27-2008, 06:11 PM

Quote:

Originally Posted by metalfanat1c

That's overkill even for using to burn in tubes.

Although I can only IMAGINE how much of a BEAST of a metal amp something like that would be... even if it cost $1000 to retube it.

Not overkill, the guy I built it for is a tube dealer.
Here's the interesting thing about this unit,
with just a few connection changes, a driver tube,
and an output transformer, you could convert
this one into a 20watt power amp.

metalfanat1c · 01-27-2008, 06:14 PM

Quote:

Originally Posted by Roccaforte Amps

Here's the interesting thing about this unit,
with just a few connection changes, a driver tube,
and an output transformer, you could convert
this one into a 20watt power amp.

Yeah, wonder what 12ax7s sound like in a power tube configuration? I'd imagine not very good but I don't know shit about the "turn the tables" theory.

I know if you were looking for ultima clean headroom, a 6L6 in the pre section would NEVER break up.

20 watts of 12ax7 madness.

Roccaforte Amps · 01-27-2008, 06:18 PM

Quote:

Originally Posted by metalfanat1c

Yeah, wonder what 12ax7s sound like in a power tube configuration? I'd imagine not very good but I don't know shit about the "turn the tables" theory.

I know if you were looking for ultima clean headroom, a 6L6 in the pre section would NEVER break up.

20 watts of 12ax7 madness.

No true, a 6L6 used as a preamp tube will distort.
It's been done allready.
There are a few 12AX7 based HiFi power amplifiers
on the market, do a search you'll find them.
I think one even goes as high as 40watts.
Retubes are expensive!!!!

Say Ocean · 01-27-2008, 06:33 PM

Quote:

Originally Posted by Roccaforte Amps

No true, a 6L6 used as a preamp tube will distort.
It's been done allready.
There are a few 12AX7 based HiFi power amplifiers
on the market, do a search you'll find them.
I think one even goes as high as 40watts.
Retubes are expensive!!!!

what do they sound like?

01-27-2008, 05:53 PM	#1
Roccaforte Amps Hall of Fame Member Join Date: May 2002 Location: Brea, CA Posts: 17,143	80 STAGES OF 12AX7 TUBE GAIN BROoTaLitY Just finished this. 40 12AX7's, 80ma of high voltage, and 12amps of heater current and you get 80 stages of gain! My camera is bending the pics a bit, but here you go; This is actually a preamp tube aging/burn-in rack I just built for Dougs Tubes. He'll be offering higher quality 12AX7's from now on. Putting time on the tubes before you get them does two things. One, insures you don't get any premature failures, and two it also burns off some of the nastyness/trebble associated with brand new preamp tubes. An incredible amount of work, 40 sockets, 80 mounting holes, 9 pins each, two resistors each, and all of their connections. Doug __________________ NEW AMP MODEL JENELLE 80/100 http://roccaforteamps.com/jenelle-80-100.html my music http://www.myspace.com/theblackorchids Doug Roccaforte RoccaforteAmps.com Founder and Moderator of: teh boosted midz club "And I will strike down upon thee with great vengeance and furious anger those who attempt to poison and destroy my midz. And you will know my name is the Lord when I lay my guitar tone upon you."

01-27-2008, 05:55 PM	#3
17 Tubes Hall of Fame Member Join Date: Jan 2004 Location: Cygnus....X1 Posts: 22,473	LOL....you're not shittin us? It LOOKS real. Oops..just scrolled down... me=pwnt! Cool though. Burn in. __________________ non-br00tz "...generally speaking."

01-27-2008, 05:57 PM	#4
Bumble Senior Member Join Date: Feb 2005 Location: Malta - Europe Posts: 4,035	At first I was thinking....."What the fuck, he really built this POS?" But then came the truth. __________________ The Scheduled Maintenance MY ASS! thread Absolutes are only relative devilsbasement.com anomaly-music.com Timeless Quotes: Ancient Mariner - Dealing with a girl who's surname isn't Jpeg brings a bit more urgency and enthusiasm than usual. k-train - dude, almost 72000 post WTF

01-27-2008, 05:59 PM	#5
Mr_GoodBomb Hall of Fame Member Join Date: Apr 2002 Location: Berkeley Springs, WV Posts: 8,842	40 tubes, 15 bucks each... Have fun. __________________ Guitars: - Gibson Les Paul Standard ('85) - Fender Roadworn Tele - Gibson Melody Maker (RI) - Rickenbacker 650D - Parker Fly Deluxe - Danelectro Pro - Nelsonic Tele - Vox Bulldog - Kay Semi - Kay K100 - Hagstrom acoustic - Agile Rickemposter - Washburn WI-14 - Synsonics ? Basses: - Rickenbacker 4001 '64 - Gibson Grabber - Ibanez Artcore Amps: - Peavey 5150, 4x12 cab - Orange Tiny Terror, Marshall 1965B - Ampeg V4BH, 4x10 cab

01-27-2008, 05:59 PM	#6
Rampage Senior Member Join Date: Jun 2007 Location: Phoenix, AZ Posts: 2,163	That is intense! Looks like Doug's Tubes will take another step infront of the competition. I am surprised the chassis can handle that many sockets too. __________________ G&L \| Marshall \| Bodenhamer \| Monsterpiece \| Morley Positive Transaction list: leod_74, -Juggernaut-, Dimebag11, floydroseuser, LordOVchaoS, Duderanimous, Red Planet (TGP), MatrixClaw, Danyeo, Panic (Dean) My Netmusicians.com Clips

01-27-2008, 06:00 PM	#8
chrispsullivan Hall of Fame Member Join Date: Jun 2007 Location: San Diego/San Fernando Valley, CA Posts: 11,432	that just looks like an awful lot of work

01-27-2008, 06:07 PM	#12
Kelly Senior Member Join Date: Apr 2000 Location: WVa Posts: 3,567	Where's the booby knobs? I feel for ya drilling all those holes. I get to spend the week building 34 solid walnut drawers, all with dowels to hold wine bottles, for some Terlato wine disply in NYC scheduled for March. Ugh. __________________ www.aplusguitars.com www.vhtusers.com www.guitarranch.net

01-27-2008, 06:08 PM	#13
metalfanat1c Banned Join Date: Jul 2007 Location: Huntington, WV Posts: 5,749	That's overkill even for using to burn in tubes. Although I can only IMAGINE how much of a BEAST of a metal amp something like that would be... even if it cost $1000 to retube it.

01-27-2008, 06:10 PM	#15
Kitarist Senior Member Join Date: Feb 2004 Location: Slovenia Posts: 2,390	woooooow __________________ Music has to breathe and sweat. You have to play it live Owner of CeriatoneForum.Com

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