New Amp And Questions

[aaronl]

Hey guys.

I just got a JTM-45 it is second hand and a reissue but man i like it a LOT!

Does anyone here have one also?
I have wanted a Marshall for a while, I settled on this because of price and well I am more into the older marshall sound vs the new tsl or dsl

Also Does anyone know where I can get:
1) Back Cover Plate thing?
2) Springs that Hold the tubes to the chassis? (sp?)

THANKS!

 

[Scott_F]

Re: New Amp And Questions

I can help you. Are you talking about the gold metal screen that goes across the back? Go to my website and look at hte pictures and tell me if we're talking about the same thing.

Tube springs are easy. Does it have KT66's in it? Or EL34's?

P.S. If you ever want me to take out that circuit board and put in some handwired components, let me know!

 

[aaronl]

Re: New Amp And Questions

I can help you. Are you talking about the gold metal screen that goes across the back? Go to my website and look at hte pictures and tell me if we're talking about the same thing.

Tube springs are easy. Does it have KT66's in it? Or EL34's?

P.S. If you ever want me to take out that circuit board and put in some handwired components, let me know!

oh man
ok it has KT66s some BIG ones they came with the amp they are Groove tubes and it has another set of groove tube kt66s and a set of svelvantia(sp??) 6L6s

i will look at your site and reply...

 

[aaronl]

Re: New Amp And Questions

I just wanted to say even though it probably does not need to be said, Scott_F has been an ENORMOUS help on the PM tonite.

I am getting some stuff sorted out and he is really helping A LOT!!

so a public thank you to go with the PM one!

 

[PUCKBOY99]

Re: New Amp And Questions

Aaron, I've got one of Scott's Edanas....which is a JTM45...& it's a fantastic amp.

If you ever want anything done to yours, I highly recommend Mr. F :bigthumb:

Also, for parts etc. that you might want, check out www.mojotone.com

:beerchug:

 

[Scott_F]

Re: New Amp And Questions

A's basic problem is that his amp is noisy. Tapped the preamp tubes and they are not microphonic. just has a bit of a hum to it.

Aaron, it'd probably be a good idea to pop in 3 new preamp tubes anyway. You'll always need the spares and one of them might still be the offending tube.

Even if you just get one new, good preamp tube, swap it in one spot, turn on the amp and listen. If it didnt' get better, swap it into another spot.

I'd just save time and get three new ones. I like the Chinese one in V1. Groove tubes 12AX7C is an easy way to find one. Then I like JJ's in V2 and V3.

 

[PUCKBOY99]

Re: New Amp And Questions

It might be inherant to those amps....

I had a '98 Bluesbreaker Re-Issue & it was noisy as hell. Changed all the tubes, changed speakers & rewired/resoldered the speaker wire connections.....nothing helped.

PLUS it weighed a ton....so I sold it......And bought a Celtic Edana, which is dead silent when not playing it!!!!! :bigthumb:

BTW Scott, FWIW: I wrote a review on HC & it never showed up so I sent a few emails to them....no response. So I wrote another review. It's been a week now & still nothing, so I don't know what the deal is.

Sorry...........:dunno:

 

[PUCKBOY99]

Re: New Amp And Questions

Forgot to ask Aaron: does it have trem on it? If so, is there anything plugged into the trem input?

 

[aaronl]

Re: New Amp And Questions

Forgot to ask Aaron: does it have trem on it? If so, is there anything plugged into the trem input?

yo

no trem, it is the jtm45 head which has the 4 vertical stacked inputs...

i love the sound of the amp but the hiss is kinda just hanging out there and i have no clue as to why.

the hiss sound is also affected by the presence and treble controls as well as the volume 1 (treble channel) control

and if i turn channel 2 volume to like 7 the noise all but quits, BUT BUT if you go to 8-10 it comes back!!!!

 

[PUCKBOY99]

Re: New Amp And Questions

:dunno:

Mine hissed like mad & it drove me nuts to play. It had a trem & I didn't have the pedal, so I just plugged a cord into it & it calmed it down a bit, but the hiss was still there. I just figured it's a loud amp...........loud in a bad way!

 

[aaronl]

Re: New Amp And Questions

:dunno:

Mine hissed like mad & it drove me nuts to play. It had a trem & I didn't have the pedal, so I just plugged a cord into it & it calmed it down a bit, but the hiss was still there. I just figured it's a loud amp...........loud in a bad way!

AYE
I really wish I would have known about it, the auction didnt say anything about it hissing etc

The sound coming out is good, but there is that hissing sound in the background

 

[Scott_F]

Re: New Amp And Questions

Before you give up, slap a new trio of 12AX7's in there. That might help a lot.

You said in that one PM that it kinda goes away when you have one of the volume pots at 7 or something. Might need a new pot if that's the case.

 

[ES350]

Re: New Amp And Questions

I know it's a different amp, but I had that hiss problem with a few 50 watt Hiwatts I had, and a little lead dress helped quite a bit...just an idea.

 

[Scott_F]

Re: New Amp And Questions

Aaron doesn't sound too comfortable opening up the amp, but taking a wooden chopstick (actually the ones I got at PF CHanges are freakign PLASTIC now!) and move the wireds around a bit and you might eliminate the problem, or you might at least hone in on the problem.

Start at the input jacks and move those wires around. Just don't touch anything inside and fry yourself.

 

[aaronl]

Re: New Amp And Questions

Aaron doesn't sound too comfortable opening up the amp, but taking a wooden chopstick (actually the ones I got at PF CHanges are freakign PLASTIC now!) and move the wireds around a bit and you might eliminate the problem, or you might at least hone in on the problem.

Start at the input jacks and move those wires around. Just don't touch anything inside and fry yourself.

nah i will open that sucker up

i talked to marshall today a guy named joe was outstanding on the phone he said he was going to check into it there

i am going to try to work through the problem, i am just bummed because the auction said 100% perfect working order and this can't be the way it left the factory

 

[Scott_F]

Re: New Amp And Questions

Well, you could always approach the guy for a return if you think he's misled you.

 

[aaronl]

Re: New Amp And Questions

Well, you could always approach the guy for a return if you think he's misled you.

I have tried to talk to him but he became very defensive and very agressive about it, i could share some emails with you but he has not been very kind about it all.

I may have to use the paypal method but I would like to try to get it to work you know...

I am about to open it up... Thanks for all the help!!

 

[aaronl]

Re: New Amp And Questions

OK

I took it apart, well took the head out of the cab.

I cleaned everything i could with some compressed air.

I jiggled wires, and just generally tried to pretend I knew what I was doing...

Something musta worked because put it all back together and the hiss is all but gone, there is still a little hum but that is probably from my 50s home an no real ground in my house.

SOOOOO
I guess that just a good cleanin and fiddlin is enuf to fix things eh?

Am I an amp tech now bahahahaha :smack:

:dance:

 

[Scott_F]

Re: New Amp And Questions

That's awesome!

 

[Gr8Scott]

Re: New Amp And Questions

Congrats Aaronl! Scott is the best! That's why I'm buying an Edana from him.