Marshall 9100 And 9200 W Jmp1

[MarshallMonster]

Suicide by Weaponized Sound. MarshallWMD

Just finished cleaning up a 9200 and would like to run the Jmp1 with it. I have the 9100 too but waiting to clean it up to compare compression curve among other things later.

I have a few questions about signal path but first I’ll give you some idea of what I’m thinking.

I bought these because they are unique and one of the only good looking Power Amplifiers because They don’t look like computer equipment for predicting weather.

Dual mono block meant I could do a lot of different things at once. The first thing that came to mind was tube testing side by side instantaneously back and forth or simultaneously. Preamp and power. Same type, different brands... NOS vs New. Also thought I could test different types of power tubes...El34 vs Kt88s. I have kt88s in my jcm800 but I’ve never had anything else... I switched without even trying the el34s. Stupid I know but Corgan was gospel. Lol

I believe I will have to be able to bias them separately for this. Please chime in with what you know. Is it possible for this amp? I’m fairly certain the entire amp is completely separate from one side to the other. I know they will need separate bias just wondering if this amp is capable. Any amp is...just a matter of time and money.... like my friend use to say.... anything is portable if you’re willing and able to carry it.

For some reason even the stock tubes barely fit...well I’m guessing these are stock but they probably aren’t...jjs. Kt88s will need a higher ceiling which is ok because I will be making a custom enclosure for this chassis to make it look more like a traditional amp head. Maybe a deep yellow stained flame or curly maple playing off the gold face. Probably build it so that the Jmp sits well protected below the 9200 so that’s I can install a clear top window to see inside in addition to the front face window inside maybe some yellow leds to beam out if the tubes themselves don’t light up the interior space as I'm fairly sure they don’t do enough. Its too sexy in there to be sitting in the dark. I like the ominous glow of other amps that have employed lighting. I just want to make something beautiful for fun.

I was also thinking of the advantage of having both kt88s and el34s running at the same time. I can test into separate cabs or separate sides of the same cab. Testing purposes are best left same cab separate sides. Performance would be separate cabs or if I wanted to be fully crazy I could try each side of the amp into each side of either cab. Giving each amps representation into each speaker type.

I have uk 8 ohm vintage 30s in a Randall cab that is stereo capable, 4 ohms per channel stereo and 8 ohms mono

Chinese 16 ohm Greenbacks in a peavy cab that is stereo capable,
8 ohms per channel and 16 ohms mono

Uk 8 ohm g12 65s in a jcm800 B cab that is mono only... I could convert but why it’s still stock. Have the jcm800 1983. This 9000 is just fun with the science of sound.

So for all my imagination I’m still behind the curve when it comes to the technical side.... after mono...it gets a little more confusing than I can keep up with. I can’t find a good manual and I’m not entirely clear how I would hook up these various arrangements.

Starting with the basics how should I be hooking this up with my Jmp into 9200, into an 8 ohm cab. I’m fairly sure but with this much power and cash in gear...I’d rather ask first.

Jmp out from left or right...does it matter? Into input a or b power amp side then out of a or b output... strictly and respectively, into mono section of 8 ohm cab with the 9200s 8ohms switch slid into place. Option 1

Jmp out from left and right into input A will the signal input A split the signal and send to each of the A outputs? If I hook up two 8 ohm cabs what is the resistance for the power amp setting? Option 2

Jmp out from left and right into input A and B then out of both A and B outputs to 8 ohm cabs in mono... option 3

Jmp out from left and right into input A and B and out of both outputs of both A and B into either side of separate cabs so that each type of speaker is represented by each tube type sending from the power amp. Example power amp A into one half of Vintage 30s and one half into Greenbacks and power amp B into one half vintage 30s one half Greenbacks. The crossover comes via the double outputs of both A and B. Option 4

Last but definitely not least...

Jmp1 out from both left and right into both A and B and one cab per power amp out that’s 4 cabs. We won’t even talk about mono vs crossing over to mix speaker types. Option 5

I forgot the very last option... the Nuclear Bomb of the MarshallMonster....the WMD of WeaponizedSound.
Buying another Jmp1 and hooking up both the 9100 and the 9200 in the arrangement above.... with 8 cabs...that’s 4 full stacks of stupidity.... and at least one man with bleeding ears and a serious concussion.... bludgeoned to death by his own Frankenstein Amp Monster....Suicide by Sound.

Now to a logical extreme...probably somewhere within the first 4 options but anyone willing to amuse us all... how would each option work... am I close? My current cab arrangement without modifications are limiting... I would need to re wire the 16 ohm down to match my 8 ohms. The 9000 series only have 8 and 16... no choice for 4 but I feel like I don’t need it. Im sure I’m missing something in regards to ohms once I enter stereo...I’m almost too tired to think....I’m lost in my own insanity here. Tomorrow morning I have free sonic range of this house and I’d like to have some fun.

Thanks in advance. I look forward to hearing from someone as crazy as me....just hope you know more than me.that shouldn’t be too hard. I wanted to keep an eye on the tubes so I’ve left the face and top off the amp.

 

[Mitchell Pearrow]

To the best forum ever! Quite the under taking, proceed with a bit of caution! Sounds as if you have a healthy plan , keep us informed of your progress

 

[MarshallMonster]

This place does seem a little more unruly and wild than talk bass. Gotta say I like that. The guys over in that Vm best thing since 2203 are making me laugh quite a bit.

 

[Harlequin tusk]

I like the Bass stack .....

 

[MarshallMonster]

I posted on talkbass too. Funny you should mention it. Seems to be more lively over there but it’s pretty strictly bass.... I got away with posting this thread there though. lol. I think I need to extract my questions and place them point for point

 

[MarshallMonster]

This site won’t let me link... just google 9100/9200 manual

That’s the manual. 4 pages. Just confused about hookup. It says that
Channel A input jack
Accepts input from preamp
Note! Using 14 only connects input signal to both channels A & B for parallel mono operation. *** does that mean?

 

[MarshallMonster]

Right now all I want to know is how to hook it up. Jmp1 to 9100. Instrument cable to the amp? Stereo cable from the amp. Should I use b side because it says using a side only gives dual mono operation and a and b.

 

[mickeydg5]

Hello, .

This site may prohibit links until you are vetted or put in enough time or whatever.

Here is the manual link:
https://drtube.com/schematics/marshall/91009200.pdf

Plugging into jack #14 or Channel A only will send the same signal to both sides for using both amplifiers in mono. Hooking up to both Channel A and B inputs separates the two for use in stereo or separate signals from difference sources.

 

[Dogs of Doom]

Hello, .

This site may prohibit links until you are vetted or put in enough time or whatever.

Here is the manual link:
https://drtube.com/schematics/marshall/91009200.pdf

Plugging into jack #14 or Channel A only will send the same signal to both sides for using both amplifiers in mono. Hooking up to both Channel A and B inputs separates the two for use in stereo or separate signals from difference sources.

they carefully worded it that way, because that's exactly what it does.

Solid state stereo amp's usually have a bridge mode, so you can pull the power together into a more powerful single mono out. W/ tubes, you do not have that ability, so you get essentially a y cable that pushes 2 mono channels at their rated watt values.

Parallel = Y

Channel B, when you plug into it, trips a switch that separates the inputs of both channels, so they are then independent of each other. If you only run into B, or if you put a plug into B when only driving A, you will only get power of whichever channel is getting signal.

input/output:
signal into A only = both channels mono out
signal into A w/ plug in B = channel A output only mono
signal into B only = channel B only mono out
signal into channels A & B = stereo out both channels

 

[MarshallMonster]

TalkBass is way more active though

 

[MarshallMonster]

Hello, .

This site may prohibit links until you are vetted or put in enough time or whatever.

Here is the manual link:

Plugging into jack #14 or Channel A only will send the same signal to both sides for using both amplifiers in mono. Hooking up to both Channel A and B inputs separates the two for use in stereo or separate signals from difference sources.

they carefully worded it that way, because that's exactly what it does.

Solid state stereo amp's usually have a bridge mode, so you can pull the power together into a more powerful single mono out. W/ tubes, you do not have that ability, so you get essentially a y cable that pushes 2 mono channels at their rated watt values.

Parallel = Y

Channel B, when you plug into it, trips a switch that separates the inputs of both channels, so they are then independent of each other. If you only run into B, or if you put a plug into B when only driving A, you will only get power of whichever channel is getting signal.

input/output:
signal into A only = both channels mono out
signal into A w/ plug in B = channel A output only mono
signal into B only = channel B only mono out
signal into channels A & B = stereo out both channels

That’s better. Thanks guys. I’ll decipher this better with this info. The 9100 works but the 9200 is putting out no sound pushes lots of hum through speakers.... the JJs have more exposed plates than the sovteks but they seem very red... like what a picture of red plating looks like. But every tube? Can’t be every tube. There must be another problem

 

[mickeydg5]

Bad bias supply can cause red on every power tube if that is what you are referring to in this instance.

 

[MarshallMonster]

That’s what I was thinking. I’ll take it to my amp tech and have him go over it thanks. How will the tubes be typically after being run this hot?

 

[MarshallMonster]

If I have to retube any suggestions. I’ll be asking if I can bias a an b channels separately. If I can than el34 and kt88... if not maybe KT66 and not sure yet. I started by chasing corgan tone...which led me to it 88s I bought gold lions because I was sure which Chinese tube corgan had bought...he tried more expensive ones but went back to Chinese. They break up earlier and effect different frequencies when they do.

 

[mickeydg5]

I guess when you say Corgan that refers to Billy Corgan.

Each amplifier side has its own bias adjustment as well as bias balance control.
The amplifier can handle 6L6/5881/KT66 and 6CA7/EL34/KT77 types (as long as they fit). The 6550/KT88 falls in between.

If the power tubes were redding before you got a hold of it or for any decent time, especially cherry red, then trash them.

 

[MarshallMonster]

Thanks. Do you have or have you had one of these?

 

[MarshallMonster]

Sucks. I wanted to use the amp with Half as many tubes as my sound tester

Tonight I want to use A channel in 8ohms to the Randall which is 8 in mono and the B channel in 16 to the peavey which is 16 mono. I’d be running both blocks independent and both cabs in mono. I guess this will work. Does anyone think the same speaker in 16 sounds different than 8? I can rewire them differently either up or down by series or parallel not necessarily respectively right. I’d have to double check which does what.

It’s too bad that 50 Watts isn’t enough to really push those speaker. I’d have to go stereo with two speakers to get closer to understanding what that’s like. I think that would make the cab sound a little underpowered and hollow.

Also...first position is supposed to have ecc81....only one of these amps do...apparently it is via this tube that the sound is splitting or phase inverting. Why is there not one in this slot? Does it matter. The 9100 has the Marshall ecc81

 

[MarshallMonster]

Would this be right? B to 16ohm cab mono and A to 8 ohm cab mono? From the Jmp1 is left and right outputs

 

[mickeydg5]

Thanks. Do you have or have you had one of these?

I have an EL34-50/50 and an EL34-100/100. The 9100 and 9200 are the precursors.

 

[mickeydg5]

Those amplifiers are the same except for differences supporting the 2 versus 4 output tubes. The driver and PI tubes should be identical for each.

V1 drivers = 12AX7/ECC83
V2 PI's = 12AT7/ECC81