Have a triode left over want to add a slash monster noise machine channel

[Mike_J]

I posted earlier that I want to build sluckey's Plexi/800 amp.  Asked if anyone had a Plexi active fx with PPIMV example which of course tubenit had many examples.  One, the D'Mars very much intrigued me because it has a cathode follower tone stack that only requires one triode of a 12A_7 tube.  The other triode is replaced by an N-channel mosfet.  Thereby leaving me an extra triode. 

I immediately thought back to what I believe is tubenit's post on what two amps would you build.  One of the responses by one of the posters was one that I could sell.   I will send a follow-up post to give appropriate recognition to the gentleman with that great idea.  So in light of the great idea about building something you can sell and my good fortune of finding a spare triode I am asking for ideas on how to utilize my good fortune of finding a spare triode. 

I am learning towards going from my original post of making a plexi/800 amp to my new idea of plexi/800/slash monster noise machine.  Unfortunately, I seem to lean towards building 100 watt amps and the only people young enough to carry one of my amps or with hearing left to enjoy it (until they start pounding away at the slash monster noise machine) are young. 

What I want is a footswitchable metal head tone.  That should sell like hot cakes.  And some of the youngsters might trip across the plexi or 800 channels and hear what real tone is.  (Although as I recall my father thought those amps created a lot of noise.)

It is my opinion that whatever one listens to during their formative years is their standard for musical tone.  I remember when my great-grandfather who even in his 80s would play the tuba in his John Phillip's Sousa band at the gazebo out on the island in Marquette, Michigan.  (Early 1960s - Can still smell the popcorn from the red and white striped popcorn machine)  He thought Frank Sinatra and the swing bands were horrible.  Anyway if you want to sell amps you have to make what the buyer's want to buy.

Any ideas for my slash monster noise machine channel would be greatly appreciated.  But remember I am limited to one triode.

Thanks
Mike

[Mike_J]

"One that sells" quote is attributable to G. Hoffman.  Thank you for your input into my inspiration for this addition to my new amp.

Thanks
Mike

[tubenit]

Just one more to consider in the mix.  Add two more tubes and fixed biased if you want.

with respect, 10thtx

[Mike_J]

Didn't Marshall build a multi-channel amp that included a Plexi, an 800 and a high-gain channel?  I am sure this has been done before just have to find out where and how.

Thanks
Mike

[Mike_J]

Has anyone played the Marshall Jubilee?  That might be a format for the third channel.  Apparently Slash plays a Marshall Jubilee and I happen to like a lot of the things he does.  What I am looking for is an amp high gain enough to do metal?  Unfortunately I haven't listened to enough of it to know any better.  What I know is that most kids at Guitar Center play very similar riffs.  Reminds me of when we used to make fun of people that played Stairway to Heaven at the music store because everyone seemed to know it and pulled it out at the music store.

Thanks
Mike

[HotBluePlates]

You should probably looks at these threads:


Thread 1
Thread 2
Thread 3


The "AFD amp" (Appetite for Destruction) is one a number of folks have built in various incarnations. I haven't so's ya gets what ya gets.


Be careful that your amp project doesn't spin out of control. Many amps that try to do everything do few (none?) of them well. Combine that with homebrewing, and it might not do anything at all.

[tubenit]

http://el34world.com/Forum/index.php?topic=745.0

Might want to check out the above for some more ideas.

With respect, Tubenit

[Mike_J]

Thanks HotBluePlates and tubenit for your input

I came up with an idea I might try.  My HRM only uses one triode for its overdrive.  I have a pot on the back of the amp that adjusts the amount of signal entering the overdrive circuit.  The overdrive is switched in and out of the circuit with a relay controlled footswitch.

I saw a U-tube video of some guy playing an amp similar to mine.  When he increased the signal going into the overdrive and used his seven string guitar it made a pretty convincing metal sound.

What I think I might do first is add the mosfet to my hrm and convert the overdrive channel tone stack to a cathode follower.  If this works as well as I hope it will then my first try at the slash monster noise machine will be simply to add the mosfet and a footswitchable overdrive channel to sluckey's plexi/800 design.  If it works I will probably drop noise machine from the description of the channel in my marketing literature.

If that doesn't work I will go to Plan B.  Guess I better place an order with Doug today and get started.

Thanks
Mike

[tubenit]

Mike,

Something else to ponder (if there is room) is to use a 12AX7 triode into a 5879 pentode with a 12AX7 cathode follower behind it or a mosfet cathode follower behind the 5879.

I built a TOS  with this design in the overdrive and really liked it ALOT.  Got great sustain and harmonics with it.

There is a schematic for it in the SCH Library.

With respect, Tubenit

[Mike_J]

tubenit

I have a local metal work shop make my chassis for me.  He punches the holes for the ac input jack and PT hole (when I use a laydown transformer).  I use drill bits and step drills to make the rest of the holes in the chassis.  I have been using aluminum chassis for a while now because they are easier on drill bits versus steel.  He only charges me $40 each for the chassis and does good work.  If I made a lot of the same size he would drill all the holes too (he has fancy equipment that cuts all the holes) for even less money per chassis.

Anyway, the speaker cabinet I am going to be matching this head to is 30" wide so I will make the cabinet that size so they match.  I am going to have the chassis made 25-1/2" wide, 8-1/2" deep and 2-1/2" high with 3/4" lips on each end.  I doubt that I will use all the space I will have but I have learned it is better to have the space and not need it than to need the space and not have it.  I make and cover my own cabinets so I can make them any size I want them to be.  I also design my own faceplates and back plates and have them printed on vinyl for about $5 a side.  If I decide to add a new pot or switch it isn't that big of a deal because it only costs me $5 for a new faceplate or back plate that incorporates the change.  I have silk screened my own nameplates for my heads and speaker cabinets.  Have enough extra made for a few more builds before I have to make more. 

Have pilfered the design for my heads and cabinets from a combination of Fender, Marshall, Dumble and Mesa amps and cabinets.  I try to make my amps all look very similar so if you saw a head and cabinet that is mine you would know I made it.  Took me a while to come up with a combination that is authentically pleasing at least to my taste.

Like I said earlier I downloaded expressSCH.  Having problems though with my library.  Every time I open the library up it is empty.  I am definitely missing something.  Do you have any idea what I may be doing wrong concerning accessing the SCH library?

Thanks
Mike