Builders: Your fave replacement OT for JTM45 RI?

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Builders: Your fave replacement OT for JTM45 RI?

Postby B-Squared on Thu Aug 30, 2007 7:15 pm

Hey guys--I'm rapidly coming to the point where I have to decide what OT to put in this baby. I'm using KT-66 tubes (ValveArt, can't afford the GEC), and for now am sticking with the PCB.

What's you favorite replacement OT? I'm looking for the classic JTM sound, and will augment for anything heavier (if needed) with pedals.

Thanks!

BB
I use Punky McGoo's pickups...and Grundy MacTavich's electronics in my guitars. :D
I also use some Bardledoo caps, and like what I hear. ;)
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Postby 908ssp on Thu Aug 30, 2007 7:21 pm

Marstran he just put more effort into coping the old tone then others have. The prices are good too.

http://www.marstran.com/
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Postby B-Squared on Thu Aug 30, 2007 7:44 pm

I like the sound clips provided on the site...very nice tone.
Nice price, as well.


BB
I use Punky McGoo's pickups...and Grundy MacTavich's electronics in my guitars. :D
I also use some Bardledoo caps, and like what I hear. ;)
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Postby Simon Wicks on Thu Aug 30, 2007 8:37 pm

Marstran RS deluxe OT. I have one in my JTM 45 clone :thumbsup:
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Postby drewleslie on Thu Aug 30, 2007 8:46 pm

+1 for Marstran. Get his PT also. It does make a difference.

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Postby TM1 on Sun Sep 02, 2007 7:35 pm

Mercury Magnetics Radio Spares JTM-45 o/p. Best I've heard and yes, I have heard the Marstran. I think the Mercury is more open and harmonically richer.
BTW, Mercury now owns the Trademark for the names "Radio Spares" & "RS".
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Postby RobertR on Sun Sep 02, 2007 8:04 pm

Hi Guys,

I've received my PTP board from Metro the other day for my RI Bluesbreaker. I also purchased a Drake - thought that the MMagenetics was a bit expensive..

As the Bluesbreaker and the JTM are "similar" has anyone got any experience with the Drake?

Thanks
R
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Postby Simon Wicks on Sun Sep 02, 2007 8:58 pm

TM1 wrote:Mercury Magnetics Radio Spares JTM-45 o/p. Best I've heard and yes, I have heard the Marstran. I think the Mercury is more open and harmonically richer.
BTW, Mercury now owns the Trademark for the names "Radio Spares" & "RS".

They'd have a hard time doing that considering RS still trades in the UK :wink:
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Postby LD50 on Sun Sep 02, 2007 9:05 pm

I believe that the OT in the JTM45RI is a Drake 784-389 as stock.

You have done well if you have managed to get an original 60's Drake 784 103.

I have a Mercury Magnetics Axiom O45JT-16 in my clone, and was not the tonal revelation I expected. To be fair it was the one with 4/8/16ohm and 100v tap and is no longer listed so more recent offerings may be better.

Had happy dealings with Marstran nice 50 watt tranny, not tried the JTM45 version.
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Postby TM1 on Tue Sep 04, 2007 4:00 am

Simon Wicks wrote:
TM1 wrote:Mercury Magnetics Radio Spares JTM-45 o/p. Best I've heard and yes, I have heard the Marstran. I think the Mercury is more open and harmonically richer.
BTW, Mercury now owns the Trademark for the names "Radio Spares" & "RS".

They'd have a hard time doing that considering RS still trades in the UK :wink:


they don't use the "Radio Spares" logo anymore. It's simply RS Components".
Mercury was granted the Radio Spares and RS Trademarks in the U.S. They might have a bit of trouble in the U.K.
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Postby jcmusic on Tue Sep 04, 2007 4:29 am

LD50 wrote:I believe that the OT in the JTM45RI is a Drake 784-389 as stock.


I can verify the '97 25th Anniv. BB RI has a Drake (not sure which).
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Postby Sudsysul on Wed Sep 05, 2007 4:07 pm

LD50 said, "not the tonal revelation I expected." I appreciate that kind of honesty. While I haven't done a transformer swap with my JTM45RI, I have done many things with amps and guitars over the years. What I think I do is comment on websites when it's a positive, and if it's a negative change I don't say anything. I think we all like to believe in what we're doing. In the spirit of LD50's honest comments, in a few days I'll receive my bias-rite stuff and Shuagang KT66's and I promise to shrug my shoulders if that's all they do for my amp. :?

Has anyone gone from the stock tranny to an aftermarket and been blown away by the differences?
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Postby Simon Wicks on Wed Sep 05, 2007 10:23 pm

Sudsysul wrote:LD50 said, "not the tonal revelation I expected." I appreciate that kind of honesty. While I haven't done a transformer swap with my JTM45RI, I have done many things with amps and guitars over the years. What I think I do is comment on websites when it's a positive, and if it's a negative change I don't say anything. I think we all like to believe in what we're doing. In the spirit of LD50's honest comments, in a few days I'll receive my bias-rite stuff and Shuagang KT66's and I promise to shrug my shoulders if that's all they do for my amp. :?

Has anyone gone from the stock tranny to an aftermarket and been blown away by the differences?

Try asking over at Metroamp. The guys there have done mods on reissues and will be able to tell you the differnce. Brian Wallace will tell you there is a big difference with aftermarket trannies but then again he owns the Marstran site :wink: I would say getting KT66s in the amp along with some nice sozo signal caps, proper filtering and a new OT, you be just about spot on for JTM 45 tone.
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Postby pb23r on Wed Sep 05, 2007 10:45 pm

Chris Merren (Cerrem on this and other boards) has provided transformers for several of my amps, including a JTM45 repro. Chris is very knowledgeable and makes excellent transformers.
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Postby AbbeSauniere on Wed Sep 05, 2007 10:46 pm

How do the Heyboers stack up?
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