Re: Marshall JTM 60

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mewithoutus
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Marshall JTM 60

Post by mewithoutus » Mon Feb 12, 2007 3:25 pm

Does anyone here own a marshall jtm 60 combo?

I got one for free a couple of months ago. the 2x12 version. its a cool amp. at first it was all neglected and crappy, but i fixed her up really nice.

i put some groove tubes el34s in there, and some jj 12ax7's. sounds amazing now. kinda voxy almost. not really a marshall crunch. alot less gain, but its perfect for me. loud as hell too. in stereo with my classic 50, HEAVEN.

plus, it was free. 8)
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Re: Marshall JTM 60

Post by dinosaur » Mon Feb 12, 2007 3:42 pm

Groove Tubes are still around?  I haven't seen one in like 15 years.  :o

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Re: Marshall JTM 60

Post by JazzBlaster » Mon Feb 12, 2007 4:10 pm

I had a JTM45 it was a great amp but it only sounded good on 11
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Re: Marshall JTM 60

Post by mewithoutus » Mon Feb 12, 2007 11:48 pm

dinosaur wrote: Groove Tubes are still around?  I haven't seen one in like 15 years.  :o
the groove tubes nowadays are usually relabeled sovteks. hah.
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Re: Marshall JTM 60

Post by mjet » Tue Feb 13, 2007 1:30 am

I seem to recall two main gripes about the JTM60 series. One was that they tended to overheat (the tubes are all in a little metal cage) and the second (probably related) was that the transformers were a bit on the weak side so they weren't very efficient. The first problem is usually dealt with by installing a cooling fan (like from a PC) - most techs can wire this up directly to the power source so you don't have to fiddle with an extra source for the fan. As for the transformers, there are lots of aftermarket transformer builders - maybe there's a "kit" designed for these amps that brings everything into balance. If you got it for free, it might be worth looking into these. But I'd certainly do some research on the first issue, as that's less subjective.
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Re: Marshall JTM 60

Post by mewithoutus » Tue Feb 13, 2007 5:51 am

mjet260 wrote: I seem to recall two main gripes about the JTM60 series. One was that they tended to overheat (the tubes are all in a little metal cage) and the second (probably related) was that the transformers were a bit on the weak side so they weren't very efficient. The first problem is usually dealt with by installing a cooling fan (like from a PC) - most techs can wire this up directly to the power source so you don't have to fiddle with an extra source for the fan. As for the transformers, there are lots of aftermarket transformer builders - maybe there's a "kit" designed for these amps that brings everything into balance. If you got it for free, it might be worth looking into these. But I'd certainly do some research on the first issue, as that's less subjective.
yeah ive heard those problems. so far, ive had no issues, but i am going to invest in a fan for it sometime soon, and i may replace the transformers. however, someone noted that mine was a later model so it might not have the problems of the earlier ones.

thanks for the help.
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Re: Marshall JTM 60

Post by mjet » Tue Feb 13, 2007 6:27 am

The early vs later models might well be the issue you need to look at to see how much is internet chatter and how much is real. You can also scan the messages at the Marshall Amp Forum:

http://www.marshallampforum.com/forum/

Here's one thread on that very issue with some fan installation options:

http://www.marshallampforum.com/forum/v ... php?t=6704
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Re: Marshall JTM 60

Post by mewithoutus » Wed Feb 14, 2007 4:01 am

i need more bass... :-\
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Re: Marshall JTM 60

Post by JazzBlaster » Wed Feb 14, 2007 10:21 am

mewithoutus wrote: i need more bass... :-\
damn! all I brought is cowbell!
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Re: Marshall JTM 60

Post by i love sharin foo » Thu Feb 15, 2007 2:13 pm

mewithoutus wrote: i need more bass... :-\
An extension cab with a couple 15" speakers would probably go a long way toward fixing that. I have been using an early 70s Fender 2x15" cab for a little while now and it does fill out the low end a lot. They are usually pretty cheap too. Not the easiest thing to transport, but everything has a trade off  :)

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Re: Marshall JTM 60

Post by mewithoutus » Thu Feb 15, 2007 10:34 pm

i love sharin foo wrote:
mewithoutus wrote: i need more bass... :-\
An extension cab with a couple 15" speakers would probably go a long way toward fixing that. I have been using an early 70s Fender 2x15" cab for a little while now and it does fill out the low end a lot. They are usually pretty cheap too. Not the easiest thing to transport, but everything has a trade off  :)

Justin

:o :o :o

why didnt i think of that! i always see older bassman cabinets or bandmaster cabinets with 2x15 and have never given them a second glance. genius i tell you.
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Re: Marshall JTM 60

Post by i love sharin foo » Fri Feb 16, 2007 7:34 am

These cabs are rated at 4 ohms, so you might have to do some speaker swapping or rewiring to get what you need from it. Does the JTM60 have an impedence switch on the back panel? If not, do you know what load the stock speakers are?

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Re: Marshall JTM 60

Post by mewithoutus » Fri Feb 16, 2007 2:38 pm

i love sharin foo wrote: These cabs are rated at 4 ohms, so you might have to do some speaker swapping or rewiring to get what you need from it. Does the JTM60 have an impedence switch on the back panel? If not, do you know what load the stock speakers are?

Justin

the amp has two 8 ohm 12 inch g12 celestion heritage speakers, wired in 16 ohm. but when you unplug the internal speaker, you can use an 8n ohm load on the external speaker jack. its confusing. no impedance switch. just a 16 ohm internal speaker jack and a 16 ohm extension jack.
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Re: Marshall JTM 60

Post by Felix » Sat Feb 17, 2007 5:01 pm

Man did a single 15 amp work wonders for adding bass. It was an amp, but still it works great for adding more low end thump.
2x12 amps usually offer up some healthy low tones, too.

Anyway, just a thought.
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