I've got a chance to snag a 50 watt JMP

[The Golden Boy]

Re: I've got a chance to snag a 50 watt JMP

Not ALL of them are PCB. Here's the inside of my 85' JCM 800.

In the last two weeks I've learned some really crazy Marshall stuff.

 

[The Golden Boy]

Re: I've got a chance to snag a 50 watt JMP

Just gives it some character

Any cig burns on the tolex?

Refer to post #38. :laugh2:

No cigarette burns on the amp, they're all on my headstocks. And my arm. :smack:

 

[ErikH]

Re: I've got a chance to snag a 50 watt JMP

Not ALL of them are PCB. Here's the inside of my 85' JCM 800.

Ya got a bigger picture there? I can't see this one very well.

 

[Luke Duke]

Re: I've got a chance to snag a 50 watt JMP

Just a little. :laugh2:

Good I didn't want to seem like I was putting on a fascade! :dance:

 

[Jeff_H]

Re: I've got a chance to snag a 50 watt JMP

Ya got a bigger picture there? I can't see this one very well.

But I'm really cheating. This is the mod Jeff Seal did for me.

 

[ErikH]

Re: I've got a chance to snag a 50 watt JMP

But I'm really cheating. This is the mod Jeff Seal did for me.

I thought I smelled "mod" around there somewhere when you said the year was '85.

 

[JeffB]

Re: I've got a chance to snag a 50 watt JMP

I thought I smelled "mod" around there somewhere when you said the year was '85.

I was gonna call Bull$hit on him Erik, cos I knew Jeff's amp was modded by Jeff Seal..but figgered with the loop TGB has been thrown for in the past week re: marshall's it'd be fun to see him squirm some more

 

[ErikH]

Re: I've got a chance to snag a 50 watt JMP

I was gonna call Bull$hit on him Erik, cos I knew Jeff's amp was modded by Jeff Seal..but figgered with the loop TGB has been thrown for in the past week re: marshall's it'd be fun to see him squirm some more

I guess that's what TGB gets for showing off his boxes...:lmao: :lmao:

 

[The Golden Boy]

Re: I've got a chance to snag a 50 watt JMP

I'm dizzy... room spinning... not PTP... ack...

:laugh2:


How's this?

 

[JeffB]

Re: I've got a chance to snag a 50 watt JMP

I'm dizzy... room spinning... not PTP... ack...

:laugh2:


How's this?

So when ya gonna start charging for "airfare" to mars with that thing?

 

[chill]

Re: I've got a chance to snag a 50 watt JMP

at low volumes it's still too thin for me.

You may be able to fix that by hanging a 100K resistor off the MV's wiper lug.

 

[chill]

Re: I've got a chance to snag a 50 watt JMP

It has a very smooth volume and Gain pot, which I've heard were rarities at that time.

Does it have the bright cap on the gain pot? What value?

 

[Luke Duke]

Re: I've got a chance to snag a 50 watt JMP

Does it have the bright cap on the gain pot? What value?

No clue man, how would I know? Moving the knob didn't seem to change the brightness of the amp.

Luke

 

[Jeff_H]

Re: I've got a chance to snag a 50 watt JMP

Are you going to buy the damn thing, or not Luke?

 

[Luke Duke]

Re: I've got a chance to snag a 50 watt JMP

Are you going to buy the damn thing, or not Luke?

I've got to have another set of ears listen to both amps besides my own....I'm leaning heavy on the Marshall, but to get it a certain blue guitar will have to find a new home.

Luke

 

[chill]

Re: I've got a chance to snag a 50 watt JMP

No clue man, how would I know? Moving the knob didn't seem to change the brightness of the amp.

You could either look at the gain pot inside the chassis, or compare the brightness of the gain at 1 with the brightness of the gain at 10. If they're the same brightness, it probably does not have that cap. If 1 is brighter, it has the cap. If the preamp gain comes on early in the sweep and then thickens up some as you go from, around 3 to 10, then it probably has a really big bright cap, like .0047uF.

 

[ErikH]

Re: I've got a chance to snag a 50 watt JMP

You could either look at the gain pot inside the chassis, or compare the brightness of the gain at 1 with the brightness of the gain at 10. If they're the same brightness, it probably does not have that cap. If 1 is brighter, it has the cap. If the preamp gain comes on early in the sweep and then thickens up some as you go from, around 3 to 10, then it probably has a really big bright cap, like .0047uF.

.0047uf is actually pretty small, but still a bit bigger in value from the .001uf caps normally used or even the 220pf or 100pf.

 

[chill]

Re: I've got a chance to snag a 50 watt JMP

.0047uf is actually pretty small, but still a bit bigger in value from the .001uf caps normally used or even the 220pf or 100pf.

Right. .0047uF is pretty small for a coupling cap and pretty big for a brite cap.

 

[XSSIVE]

Re: I've got a chance to snag a 50 watt JMP

a certain blue guitar will have to find a new home.

Luke

i like blue guitars

too bad i don't think i could swing that now way too much going on for me.

-Mike

 

[Luke Duke]

Re: I've got a chance to snag a 50 watt JMP

i like blue guitars

too bad i don't think i could swing that now way too much going on for me.

-Mike

Tsk tsk
Mike shoot me a PM about time frame if you're interested.

You could either look at the gain pot inside the chassis, or compare the brightness of the gain at 1 with the brightness of the gain at 10. If they're the same brightness, it probably does not have that cap. If 1 is brighter, it has the cap. If the preamp gain comes on early in the sweep and then thickens up some as you go from, around 3 to 10, then it probably has a really big bright cap, like .0047uF.

Ok so if the amp gets brighter through the sweep it does have this cap?


Luke