NAD tommorow ! 1978 JMP 50W yummy, yummy !!

[martinw]

Yeah, Dave.  :lol:

I used to work on these, gave me the idea:
http://en.wikipedia.org/wiki/Spin_valve

[hamfist]

Once you've got it all fixed up, you might as well keep both, and run them in stereo :)

Roo

That's a fine idea. all I need to do is persuade the wife now.
   Could you possibly write me some sort of persuasive reference or testimonial stating how beneficial it would be to my marriage, life and the universe in general if I could keep both amps. I'll pass it on to my good lady and, together, we'll see if we can swing it !

[Roobubba]

Dear Mrs Fist,

Your beloved Ham and I, along with the vast unpolled majority of the tone gurus at the BareknucklePickups.co.uk forums, hold the firm and unwavering belief, backed by undisclosed scientific evidence, that the simultaneous use of two Marshall amplifiers is not only good for the soul, but is also good for the soul(s) of those who dwell with the player. Scientific studies have also clearly shown that, in some cases -particularly where the player's online nickname begins with "h" or "f", or even some combination of the two - the use of two amplifiers is necessary for the male libido to continue from the late teens towards the early seventies or eighties, which in turn is a prerequisite for life during that period.1

1Data not shown.


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Cut 'n' Paste. Job Done.

[ailean]

No! End it now, before it becomes a 40 page thread on The Gear Page and becomes part of internet "fact"!

Sorry Ailean  :oops: I was joshing.  

Valves is tubes!  :)

Ya know I really should have spotted that :) I assumed you meant that the internal current flow was different, not the physical quantum properties.

In atonement I want a fully referenced study on the effects of quantum spin in a valve amp, and if quantum entanglement can be used to remove the need for biasing. :D

Or a 10% discount ;)

[hamfist]

Dear Mrs Fist,

Your beloved Ham and I, along with the vast unpolled majority of the tone gurus at the BareknucklePickups.co.uk forums, hold the firm and unwavering belief, backed by undisclosed scientific evidence, that the simultaneous use of two Marshall amplifiers is not only good for the soul, but is also good for the soul(s) of those who dwell with the player. Scientific studies have also clearly shown that, in some cases -particularly where the player's online nickname begins with "h" or "f", or even some combination of the two - the use of two amplifiers is necessary for the male libido to continue from the late teens towards the early seventies or eighties, which in turn is a prerequisite for life during that period.1

1Data not shown.


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Cut 'n' Paste. Job Done.

very nice, Roo.

I'll give it a shot !

[martinw]

In atonement I want a fully referenced study on the effects of quantum spin in a valve amp, and if quantum entanglement can be used to remove the need for biasing. :D

Or a 10% discount ;)

Hmm, tricky one.  :?

Not the first bit, that's easy. Discounts though, ouch!

[ailean]

Not the first bit, that's easy. Discounts though, ouch!

Payback should hurt  :twisted:

[JamesHealey]

master volumes ruin tone!  :shock:

[martinw]

Not always. Depends on which type.
A good PPIMV (and there are several types) can be a useful compromise to reduce volume, as long as the amp's preamp has good enough tone in the first place.

If an MV sounds bad, it's usually because it's a bad design, or the preamp is a poor sounding preamp.

Nothing sounds as good as being loud of course!  :twisted:  Speaker/guitar interaction, Fletcher-Munsen effect, yada-yada....
Sadly, that's not always possible.

[DeanS]

I'll second that- the PPImv Martin fitted on my Marshall sounds fantastic- when run at bedroom levels it really gets close to the sound when run past say 6 or so on the master barring any volume/speaker enhancing effects. I've a Cornford Harly that was bought specifically for low volume- haven't used it since the Marshall was modded......................

Martin I will eventually get round to posting some clips!

[JamesHealey]

I was refering more to the Pre-PI MV on the JMP Master Volume Series, I don't think these amps have a scatch on the older Non-MV Marshalls..

I like the Post Phase Inverter designs, they're somewhat better but once u start pulling the volume down too far you look that interaction with the power tubes they're great for shaving off 10% of the volume.

Personally I just prefer to use 97dB sens speakers, 2x12 cab and crank.. rather than using high sens speakers and a 4x12..

[martinw]

I was refering more to the Pre-PI MV on the JMP Master Volume Series...

Then maybe you should have said that?  

I agree that the best option is to use , in the first place, a smaller amp, smaller cabs, less efficient speakers etc, but beyond that, a well sorted MV needn't necessarily take too much out of your tone, other than the effect you get by playing at lower volumes anyway.

Master volume Marshalls are very easy to turn into very nice sounding amps (eh, Dean?) with a virtually identical signal path to the NMV versions, and the bonus of more gain if required.  :)

[Will]

Well, I am in love with mine! It is so much sweeter than the jcm900, and the 0-10 gain on it beats the 900!
Was quite noisy when it got to 4 on the MV, and didn't react well to pedal gain (I boost the level and like to give it a little bit of gain, usually use 0 - 0.5 gain, at 2, it feedbacks horribly)
The gain on the amp for me was great, from 6 - 10 it added more bottom end thumpiness to the sound, and the low input is a cool new feature for me :D
Anyway, my point being, I miss it already, dropped it off this afternoon at the factory for a service. Their supplier is Svetlana I think, so thats what I am getting stuck with for a bit, are the ok? confident enough to change the preamp valves later though.

...don't know if I can be bothered to even plug the 900 back up, I just know I will be disapointed