Robben Ford's new amp and speaker

[norburybrook]

Robben Ford has a new rig interesting as he didn't use his Dumble on his last album at all and now, a new rig.

https://jazzguitartoday.com/2019/06/rob ... 0-cabinet/

how are 3, 8 ohm speakers wired and does it mean the OT is mismatched impedance wise?


M

edit: seems in parallel to give 2.6 ohm into a 4 ohm tap

[Guy77]

Very cool.
Looks like its a point to point amp since he says he uses no board of any type with his circuit.
Looks like its 3 x 12ax7 and 2 x 6L6 and a rectifier tube.
Must be tricky to wire everything that way.
It must look like a spiders web in there.

Cheers

Guy

[martin manning]

how are 3, 8 ohm speakers wired and does it mean the OT is mismatched impedance wise?

M

edit: seems in parallel to give 2.6 ohm into a 4 ohm tap

Could be two in series paralleled with the third for 5.33 ohms.

[norburybrook]

how are 3, 8 ohm speakers wired and does it mean the OT is mismatched impedance wise?

M

edit: seems in parallel to give 2.6 ohm into a 4 ohm tap

Could be two in series paralleled with the third for 5.33 ohms.

yes ,but I looked at a photo and they're all in parallel like the old 3x10 Bassman into the 4 ohm tap. just like to see how the back of the cab is, open or semi open or closed.


I think the amp is a tweed deluxe with 6L6's a and a TMB tone stack...yes, no?

M

[stevlech]

It sounds like a tweed Bandmaster in a head + cabinet configuration.

[stelligan]

Probably like a Vibro King - 2.6 ohm transformer. All speakers parallel. Hanging around Nashville has rubbed off on Robben. Not too many people playing loud around here - an edge of breakup town......

[norburybrook]

It sounds like a tweed Bandmaster in a head + cabinet configuration.

yes, which is the amp Dumble made for Eric Clapton last year. I didn't like the sound of it personally, sounded a bit wasp in a jam jar to me

is it just a JTM45 with a 3x10 cab?




M

[martin manning]

is it just a JTM45 with a 3x10 cab?

RF making a break with his beloved Dumble is pretty significant, although his recent use of a Zendrive and clean channel is basically that. LW amps are a back to basics play. I’m interested in your thoughts about vintage circuits. Have you ever worked with a 5F6-A or JTM45?

[martin manning]

...

[norburybrook]

is it just a JTM45 with a 3x10 cab?

RF making a break with his beloved Dumble is pretty significant, although his recent use of a Zendrive and clean channel is basically that. LW amps are a back to basics play. I’m interested in your thoughts about vintage circuits. Have you ever worked with a 5F6-A or JTM45?

Martin,

My first visit to TAG in 2014 was when I built my first proper amp a JTM45 with KT66's

marcus JTM45.jpg

I thought it was a great amp but sort of sidelined it as it was kind of a stepping stone to get me to my dream of the #102 Dumble. I do remember a friend of mine playing it though and saying at the time it was the best amp he'd played.

I really enjoyed the tweedle Dee I built and modified with 6L6's, switchable NFB etc so between the Tweedle dee and JTM45 I think there's good evidence I like the 'vintage' sound/vibe.

My JTM45 is paired with a 4x10 Marshall cab with Celestion 10's so I would imagine if the 3x10 little Walter cab is sealed it may sound quite similar.

I also enjoyed the Express i've just built more than I remember the first one.

Part of the problem with being able to build amps is...you do......and then too much choice starts to come into play I wonder if i'm starting to suffer a bit from that at the moment as I enjoy building and the end results, hence my interest was piqued seeing robben with this new amp/speaker


M

P.s. I wonder what the difference with 6L6's and the different filtering, voltages, OT impedance , etc would be between the Fender bandmaster tweed and the JTM45. I do like the small form factor of the 3x10 cab. Would running any amp into 2.66 Ohms on a 4 ohm tap be an issue? I might build a 3x10 cab for fun. Sounds great on the you tube demo.

[martin manning]

Just went back to read that JTM45 thread... fun stuff. I do remember the Tweedle Dee.

[norburybrook]

yes me too. My first fumblings into this after I'd built a 5w SE kit and thought I'd move on up the ladder to the next step. It was quite a big step up for me.

I've just found a you tube clip of an original '59 bandmaster 3x10 and i didn't like the sound, it had the same thing with Eric's amp, that buzzy distortion. I think it might be the speakers though as the Little walter has Eminence 1028K and they sound nice to me. I wonder if the cab is sealed or not though, can't find a rear picture.


M

[M Fowler]

I've studied this Little Walter amp just to try figure out the builder's statements on his amp, wattage RMS wise.
He sure likes to copy builds from Tino Zottola.

Here is s gut shot. You need to open the pdfs there are 2 pdfs and one photo shown.

Mark

Little Walter 59 top.pdf

Little Walter 59 gut shot.pdf

5f6a.jpg

[MakerDP]

This is all very interesting.

From the name, the description on the website and the photos it sure looks like his take on a 59 Tweed Bassman.

I also found this thread... https://ampgarage.com/forum/viewtopic.php?t=31317

[pdf64]

...I wonder what the difference with 6L6's and the different filtering, voltages, OT impedance , etc would be between the Fender bandmaster tweed and the JTM45. I do like the small form factor of the 3x10 cab. Would running any amp into 2.66 Ohms on a 4 ohm tap be an issue?...

I really can't see it being an issue; whether your OT is intended to be 6k6 RS style primary, or 8K Drake, a 2.66 load on a 4ohm secondary may increase power output a little.