Ceriatone Forum

http://ceriatone.com/productSubPages/BSJTM45_100_Exp/BSJTM45_100_Exp.htm

I want.

What is it? A 100 watt version of the JTM45?

holy moaly  100 watts?  shite! why? more headroom? :chairdance:

I have asked Nik about it being a 100W version of the JTM 45, and he said there is a tone difference. "More open, more feel to the hands."

If you know the stack Hendrix used early on (the one that ran on four KT66's) that should explain everything ;)

yeah that what hendrix used i think.
jtm45/100, but from old picture it look like it is solid state rectifier"dont know if ceriatone's one is tube rectifier or no".

hendrix used kt-66 and also 5881 for more output power i think.
he also changed the value of the tone stack.. just search about the hendrix mod on google and you will find about it easily.
and he had some other little mod in it so it be a little bit like the superlead. like the bypass cap for v2 cathode etc. it isnt on a jtm45 normally but on hendrix and superlead model it is. it's hard to tell am not a pro with that stuff :S, and as what i heard he where tweaking he's stuff everyday.

or search about rick dickinson he got one of hendrix amp.

all the marshall jmt45/100s used a ss rectifier. the b+ voltage varied a bit - somethimes it was as high as 640v. try that with a modern kt66 like the valve art!
hendrix seem to have used the 45/100 in the first part of 1967. the tone stack mod in the dickinson amp is a slight mod. the dickinson amp also has higher filtering than many other 45/100s, but this was prop a transitional value before the amp became the el34 jtm100

other famous 45/100 users are: EC (1966-late 67 or early 68), mal young (ballbreaker and possibly elsewhere)
 

this amps is about 70w clean - depending on the b+ voltage. but it is more than 100w at full volume. it isn't as loud as the later 100watters. I tried one here in trondheim recently: dark and warm sound. not harsh or overly loud. the later plexi amps are much louder. hell, there are socalled 50watters that are louder than the 45/100

Right, I'll be the 'guinea pig' for this I guess - I'm going to buy one as soon as I get the OK from Nik :)

Hopefully it will fit the plexi 100 watt cabinet I have at the moment, too.

should fit a 100w cab

thanks for the info on jtm45/100 using ss rectifier, i wasnt sure. and it where been doing a while i where wondering but enver checked any layout :S.

am also a fan of hendrix, when i can i try to play each afternoon for 2-3 hour, and 2/3 of time if not the whole time what am playing is jimi hendrix, if no it's cream/clapton, led zepplin, deep purple, black sabbath etc.

good to know for the filtering, i didnt knew about it. if there other mod/tweak they did and didnt went said here would be nice to know :).

am trying to get most info on he's amp "the jtm45/100" he had, so on futur i may try to make a reproduction the most closer that i can.

as for the filtering, he where using 32 uf of filtering to the output tube screen grid(connecting to both the tap of the 16uf can cap)?

Thanks for the info. :)

see here: http://forum.metroamp.com/viewtopic.php?t=11947
specs:
 power caps: 32uF.
no bright cap on the vol, but a 560pf over the 270 mixers
560pf treble cap, 33k slope resistor
27k feedback
preamp: 32+32uf
to qoute flames 1950: For filter cans I'd get (2) dual 32's for the two mains filters, (2) dual 16's for the screens filters, a single 32 for the phase inverter (or just one side of a dual 32) and a dual 16 for the preamp (you can wire it for either only one side of the dual 16 can for all preamp stages, or use both sides and an extra 10K decoupling resistor like the Dickinson "Hendrix" amp had.)

cool

about to order it...I'll let you all know what it's like when i get it

edit:

and it's paid for. ;D

Pictures are up

http://ceriatone.com/productSubPages/BSJTM45_100_Exp/BSJTM45_100_Exp.htm



Nik said about four weeks wait time. Not long now  :chairdance:

Hi,

A few more amps are in R&D too :) No timeframe though - it's gonna be a Soldano or perhaps even a swipe at the Mesas - but a PTP version of it.

Regards,
Andrew

thank alot for the extra info on hendrix amp :)

and radiohead, nice amp pict, that look like a tank for me lol :D.

and i where waiting the pict about it :).
that also what i have with my jtm45 kt-66 shuguangs. good tubes.
only thing i hate is the button who isnt looking as the old marshall ones. i got them too, i whanted to change them but i think i got used.

It's here  :chairdance:


(http://unofficialmusicsite.com/pics/gear/amps/2007_ceriatone_jtm45-100.JPG)
(http://unofficialmusicsite.com/pics/misc/45-100_back.JPG)
(http://unofficialmusicsite.com/pics/misc/45-100_guts.JPG)

the cabinet is a reason headshell from my super bass, which fit nearly perfectly btw.

as for the amp......looks like I'll have to wait until tomorrow to find out, haven't got a matched quad of KT66's yet! could try running it at half power, but oh well.

Looks good.  But is that just a camera angle, or is your transformer crooked?  Did the chassis maybe get bent?

How about a sound clip?  :-)

Brad

Yeah, it did get a little bent, but it doesn't look like anything bad

I'll see what I can do about some clips  ;)

tubes came this morning. four chinese/penta labs KT66 power tubes, and three chinese/penta labs 12AX7 pre's.

this amp sounds awesome. the bright channel is a bit less trebley and aggressive than a super lead, and the normal channel is a little more bassy. the amp sounds really 'pure' (if that's the right word) and clear. transparent describes it well. haven't really cranked it, but I like what I've heard so far. It's loud, too (four KT66's as i said before!)

Another great amp from Ceriatone  :)

a PTP Mesa mark II Simul series would be a hit

Hey dudes, first post here. I built the 45/100 a while ago, I have built 6 of Nik's kits, all Marshall types. I sold 3 and have kept the JTM45, the 45/100 and the 100 watt plexi. First off, I love the JTM45, the 45/100 is a different animal all together.
For my tastes, I'm mainly a strat player, the 45 is the only Ceriatone amp that I have not taken to modding. I think it's great stock, I could not say the same about the 45/100 or especially the plexi. Anyway, after doing some mods to the 45/100 I just love that amp now, for single coils it's about all I could want, never thought I'd say that. Also, the 45/100 really reacts to the volume you have it set to, at 9/10 oclock it's pretty clean and not much yee haa, at 12 oclock it starts to really have some personality, at 2 oclock it's roaring, past there I think it's just too much O/D, that's just with a strat and going into the treble input. I like it at 12 oclock, you can play rockin blues without a booster pedal I reckon, just use the vol on the guitar. Of course, this is after I did a lot of experimenting with mods n such, stock I thought the amp was in need of some help. If anyone wants to know what mods I did, just let me know, happy to pass on any help I can. Since I started building Niks kits, which was 2 or 3 years ago, I have learned a lot about how they work and have done a lot of mod experimenting, one reason I love the Ceriatones, they are cheap and easy to work on. It's the first time I've been able to get an amp doing what I want.

I'd be interested in the mods