Check this out......

[Charlie Wilson]

Redshark, you are the man! Lowplate Classic?
CW

[redshark]

I have many more pictures coming. I just have to transfer from my phone to my laptop.

Whoever wants to build me a clone of this amp is welcome!! It sounds awesome!! I will try to upload a video of how it sounds. the problem is that I will use my phone so no great sound quality but anyway it will be a reference.

[redshark]

I'm a trainwreck guy!! I have no clue of Dumble terms but, plate voltage is 460vdc.

[glasman]

Thanks Redshark

Very interesting layout. The question is, why did HAD decide to do a completely different layout and circuit board for this amp?

And, how many more PCB amps are there?

Thanks again,

Aaron

I have pictures of one that has a blue PCB, if I can find it I will post it, I have never seen one in this tube configuration, I will have to stare at the pictures a while to see what he gained from the layout.

[glasman]

Dang! I've always wondered the chassis layout for PCB ODS amps. Between this and the Rick Vito ODSR we've got two great examples! Thanks again Redshark!

Ok, am I blind? where are the relay boards?

I know I am getting old....

[FuzzFaceBuilder]

The second pot on the PI board, an NFB trimpot?

[FuzzFaceBuilder]

Dang! I've always wondered the chassis layout for PCB ODS amps. Between this and the Rick Vito ODSR we've got two great examples! Thanks again Redshark!

Ok, am I blind? where are the relay boards?

I know I am getting old....

Looks like there's a relay in the corner of V2 PCB.

[redshark]

The chassis after the recap....

[Aaron]

Dang! I've always wondered the chassis layout for PCB ODS amps. Between this and the Rick Vito ODSR we've got two great examples! Thanks again Redshark!

Ok, am I blind? where are the relay boards?

I know I am getting old....

On the overdrive board.

[redshark]

Right next to something that looks like a trimmer. That is siliconed. Probably Howard tuned it to Hoyt's liking and glued it. I have to start studying this amps. I have been here since 2009 dedicated to trainwrecks. I rarely read about Dumbles.

[Aaron]

Thanks Redshark

Very interesting layout. The question is, why did HAD decide to do a completely different layout and circuit board for this amp?

And, how many more PCB amps are there?

Thanks again,

Aaron

I have pictures of one that has a blue PCB, if I can find it I will post it, I have never seen one in this tube configuration, I will have to stare at the pictures a while to see what he gained from the layout.

Is that the blue suede head? That had a different PCB layout again.
That is one of my favourite looking amps, blue suede with vox cloth.

Aaron

[lovetone]

Hers an idea if you get chance,

Solder a white LED on long leads, power it from a 9v battery through a 2.2k resistor.

Place the led under the pcb and turn the light s down, you can now see the traces under the pcd if you can get a good picture of these we can see the traces and draw up the schematic

I do this some times on pcb amps when fault finding with now schematic

[lovetone]

I wonder if this method was an attempt to make the amp into modules to ease production and reduce construction time?

[glasman]

Dang! I've always wondered the chassis layout for PCB ODS amps. Between this and the Rick Vito ODSR we've got two great examples! Thanks again Redshark!

Ok, am I blind? where are the relay boards?

I know I am getting old....

Looks like there's a relay in the corner of V2 PCB.

Yeah I spotted that after I posted the comment. I don't see a PAB really, maybe he dumped it from the design.

[glasman]

Thanks Redshark

Very interesting layout. The question is, why did HAD decide to do a completely different layout and circuit board for this amp?

And, how many more PCB amps are there?

Thanks again,

Aaron

I have pictures of one that has a blue PCB, if I can find it I will post it, I have never seen one in this tube configuration, I will have to stare at the pictures a while to see what he gained from the layout.

Is that the blue suede head? That had a different PCB layout again.
That is one of my favourite looking amps, blue suede with vox cloth.

Aaron

Yes that is the one.

It looks like a straight build of his standard board onto a PCB.