New ODS 100W build with pictures...

[ic-racer]

Just a few additions to the chassis. I got the 6v power supply and the indicator LEDs mounted.

[ic-racer]

I noticed HAD used these star washers (which 'dig in' to the chassis) in places where the ground only goes through the jack (ie no separate ground wire).

The chassis I am using is adonized aluminum and this is good because the finish acts as an insulator. Therefore I feel like am always in charge of the signal path (rather than the other way around). From what I can tell, the output jack on the left side does not have a separate ground wire so the chassis is sanded down with the Dremel and then these star washers are placed and the securing nuts are tightened down with a socket wrench. Continuity test for ground was perfect.

[ic-racer]

So let me get this straight, I'm building/worshiping an amp that
A) Is NOT class A
B) HAS a master volume
C) Does NOT have hand wound or 'secret/special' transformers
D) Channel switches and runs its whole signal through the microscopic contacts of a cheap little relay
E) Does NOT have a Tube Rectifier

Hmm... seems like it violates all the hyped principles of good tone. (sarcasm)

This Blue Angel would be Randall Smith's antethesis of the Dumble because it is mass produced, Non-Master, Single Channel, Tube Rectifier, Class A (or close). Here is a recent clip from today of the Blue Angel with my recently restored Les Paul.

http://soundclick.com/share?songid=6167091

Tech Notes on the recording:
Amp: Mesa Blue Angel, all 6 tubes running. RCA 12ax7s, rest Chinese.
Cab: Open back combo with Alnico 4x10
Mic: Tascam Cardioid, 2.5 feet from cabinet center, head on.
Guitar: 1976 Les Paul Custom
Post:Rack mounted Spring Reverb & Digitech delay.

Here is the Les Paul, before and after. It was pretty trashed when I started. That nitrocellulose takes for ever to dry. I finished spraying in early October and rubbed it out just before Christmas. (There is a thread on it's restoration here: http://www.ferrarichat.com/forum/showth ... p?t=166941)

[ic-racer]

Not much new, as I am still waiting on more parts. I worked a little more on the capacitor board. Should have the biggie capacitors soon. I did get a set of 300uf/350v Mallorys but had to send them back because they were a little too big (1 3/4" diameter).

I wound up re-doing this board to give the the 300uf caps a little more room.

[ic-racer]

Here are some filter caps I got. The large silver can is a 300uf/350v, however, it is a little big. If worse came to worse, it actually WILL fit in the chassis, but it does look a little out of place. The gray ones are marked 290uf (-10 +50) and check out at 293 or so (as if it makes any difference). They look a little better. Either way, I don't really consider the capacitors a permanent part of the amp. Just like the tubes, they are 'renewable items'. Who knows what caps will be available in 10 years?

[ic-racer]

Thanks to CE Engineering I could get a nice can cap for up top. So at this point I have all the power supply caps.

[ic-racer]

If the chassis did not have the hole for the switch, I probably would just have kept it as 100W, but I wanted to fill the hole. turns out there was no hole for the LED, though. Well, I think the LED is the coolest part of the circuit (I think powering the LED with cathode current is very clever) so there was just enough room to add the LED. (In the original, the switch is mounted higher, giving more room for the LED).

I spend a lot of time going through the Mouser cata log to find the correct light, then I was at Radio Shack the other day and it turns out they have the same thing.

[Chad]

I like that clip of your's because #1 It sounds very good and #2 It's not Jazz!! While I should explain that I myself am not a fan of jazz (Although I know many here apparently do favor it) Most of the clips I've have heard are Jazz based I love a clean sounding Dumble in the Blues flavor. Thank you and may you and many more other's post clip's other than Jazz ,Not that Jazz is a bad thing (I'm just not that big on it ) Chad BTW Those who have posted Jazz clips are most Deff. very talented player's and are much better than myself

[ic-racer]

The Schematic:

I'll updated this schematic as I go.

There is a 'z' in the name, so as to not confuse it with the 124 schematic. I hope, when I am done that the 1Z4 will be a 'clone firendly' version of the 124.

**this schematic had some errors, see latest schematic later in thread**

[ic-racer]

I like that clip of your's because #1 It sounds very good and #2 It's not Jazz!! While I should explain that I myself am not a fan of jazz (Although I know many here apparently do favor it) Most of the clips I've have heard are Jazz based I love a clean sounding Dumble in the Blues flavor. Thank you and may you and many more other's post clip's other than Jazz ,Not that Jazz is a bad thing (I'm just not that big on it ) Chad BTW Those who have posted Jazz clips are most Deff. very talented player's and are much better than myself

Thanks for the comments. I tend to 'dig in' with the pick when I am playing fixed bridge guitars. Seems like some of the LA guitarists give a little sissy-pluck* to the strings when playing the Dumble, so I am anxoious to hear how my clone responds to my picking.

*(I think all the Dumble sound clips I have heard sound like 'studio musician' quality, so, of course I am just joking about the technique )

[Structo]

I spend a lot of time going through the Mouser cata log to find the correct light, then I was at Radio Shack the other day and it turns out they have the same thing.

You were lucky that you found something to use at RS!
9 out of 10 times when I go there the trip is wasted because they carry so little in the way of components anymore.
Plus they always want my personal information which is a big turn off to me.

Luckily I have a electronics supply house in my town and although they are more of a surplus store they carry a lot of parts.

[ic-racer]

You were lucky that you found something to use at RS!
9 out of 10 times when I go there the trip is wasted because they carry so little in the way of components anymore.

Too bad I had already ordered them from Mouser. However, I have never had good luck with LED circuits (even as a kid) so when I blow these LEDs I know now I can go back to RS to get some more...

[Funkalicousgroove]

your chassis looks like a Natchanis Chassis, they come from Thailand somewhere.

Where is the "ODS Spotters guide" I'd like to contribute

The sides are welded in on the later chassis, as well as on the silver chassis amps, however, only the silver chassis amps used the Fender style mounting, all the rest use slab-base weld nuts.

BTW, The HRM schematics that are out there are verified from De-gooped amps, but the owners of said amps asked that pics of their amps not be posted

Looks like it's going to be a cool build!

[ic-racer]

The "spotter's guide" is here: https://tubeamparchive.com/viewtopic.php?t=4318. Basically stuff I came across while trying to find a close match between circuit, chassis, and cabinet for my project. Ultimatly it would be nice to have a schematic to match to each type.

Someone else on the Ceriatone board also suggested that my chassis looks like the one Natchanis sells. I checked out his website and I suspect that is the chassis I have. For a while, after seeing the #124 photos, I thought this chassis was a copy of the #124. However there are some subtle differences, like the pre-drilled holes for the power caps board match the later power supply.

Thanks for the info on the HRM schematics. I currently have most of them in my "Pseudo-Dumble" folder. So they are probably need to be moved to the "Real" folder. I guess the reason I was interested in pictures is to check lead dress and grounding.

Kind of like a classical guitar score. Just having the notes is fine but to study a guitarists or composers technique, the right and left hand fingerings are nice to have. Likewise I have included in my schematic many of the wiring conventions Mr D used in 124 (be they important or not). Like the ground from the 5-prong switchcraft jack--it goes all the way back to the other side of the chassis to ground by the voltage regulator and the rest of the relay/led supply.

[ic-racer]

Finally, I think the schematic is finished. I thought it was finished but today I realized the OT was indicated to be wired backward. By following the blue and brown wires on #124 I think I have it correct on my schematic now. I am assuming that Hammond, by copying the same color wires as the original Twin transformer, has also copied the same internal hookup.