New Build: Ceriatone Replica OTS 50W

[norburybrook]

Use the grounding that's on the layouts and schematics in the files section for the ODS amps.

the ceriatone layouts are the sameas they were taken from this forum so your chassis will be drilled ready for your grounding points if it a Ceriatone kit.

M

[dwietzel]

The pre-populated boards I received from Marsh Amps are for the ODS 70s Skyliner. Does that relate to a particular ODS model#?

[pompeiisneaks]

In the schematic posted above it points out the 5 main grounding points. I think that it is likely those are the best for ensuring no ground loops happen, but I've not yet built a Dumble (one of my very next builds here soon). In my 8 amps total (one not yet done) I've had a few issues with grounding and have found I like the idea of the Power tubes grounding very close to the power transformer, the PI somewhere a little bit further away, and the preamp side near the inputs, so that you've got a lot of distance for the higher output stuff to travel to create feedback loops. On the other hand, I know many people swear by the single point type or star grounds as well. Merlin has a great section on grounding in his preamp book, and on the site: http://www.valvewizard.co.uk/Grounding.html (it's actually the whole chapter).

~Phil

[ToneMerc]

The pre-populated boards I received from Marsh Amps are for the ODS 70s Skyliner. Does that relate to a particular ODS model#?

I think you mean 80's Skyliner as a base line voicing. I personally equate 70's topology as a minimal; 100K plates, the funky OD network, classic tone stack and the Fender AT7 PI.

TM

[ToneMerc]

Use the grounding that's on the layouts and schematics in the files section for the ODS amps.

DItto, no need to reinvent the wheel.......stare and compare is all that is required!

TM

[dwietzel]

The pre-populated boards I received from Marsh Amps are for the ODS 70s Skyliner. Does that relate to a particular ODS model#?

I think you mean 80's Skyliner as a base line voicing. I personally equate 70's topology as a minimal; 100K plates, the funky OD network, classic tone stack and the Fender AT7 PI.

TM

I have asked Marsh amps to describe what he provided but that was the description he gave when I purchased them.

[dwietzel]

Use the grounding that's on the layouts and schematics in the files section for the ODS amps.

DItto, no need to reinvent the wheel.......stare and compare is all that is required!

TM

My confusion is does it matter which version I stare at #102, #124, #183 especially for the grounding scheme?

[martin manning]

All the same aren't they?

[norburybrook]

All the same aren't they?

exactly

I've built a few ODS now and grounding is fine. The only issue I ever had with grounding was when I used an anodised chassis that didn't ground through the speaker jack sockets/chassis. I ran a separate ground to solve that.

the 50w Bluesmaster I've just built is whisper quiet and it's 1: not very neat and 2: has transformers mounted in non standard places.


just grab a #102,124,183 layout and follow the grounding


M

[ToneMerc]

The pre-populated boards I received from Marsh Amps are for the ODS 70s Skyliner. Does that relate to a particular ODS model#?

I think you mean 80's Skyliner as a base line voicing. I personally equate 70's topology as a minimal; 100K plates, the funky OD network, classic tone stack and the Fender AT7 PI.

TM

I have asked Marsh amps to describe what he provided but that was the description he gave when I purchased them.

For reference, a " 2nd generation" aka 70's amp. If you have made changes, I guess you need to document what you actually built.

http://ampgarage.com/forum/viewtopic.php?t=12870

TM

[ToneMerc]

The pre-populated boards I received from Marsh Amps are for the ODS 70s Skyliner. Does that relate to a particular ODS model#?

I think you mean 80's Skyliner as a base line voicing. I personally equate 70's topology as a minimal; 100K plates, the funky OD network, classic tone stack and the Fender AT7 PI.

TM

I have asked Marsh amps to describe what he provided but that was the description he gave when I purchased them.

This thread gives you feeling for the evolution of the ODS voicings.

http://ampgarage.com/forum/viewtopic.ph ... 6&start=15

TM

[dwietzel]

Thanks everyone for the great feedback!

Dave

[dwietzel]

Looks like I need some basic information to see how my build lines up. After reading some of the forums referenced above, it is hard to find some specifics. For example, how do I determine if mine is:

• Pre-standard, standard or HRM OD circuit?

• Pre-classic, classic or skyline tone stack?

• Low plate and high plate?

I think this will give me some means of comparing my pre-built boards from Marsh to.

Thanks
Dave

[norburybrook]

with regards to grounding it doesn't matter which version it is.

HRM;has a separate overdrive set of tone controls on a daughter board
low plate/high plate; the low plate has 100k plate resistors the high plate has 150/220
classic/skyliner tone stack; Bass 250k- Middle 100k- Treble 100k skyliner has 500k-250-250 pots


M

[dwietzel]

with regards to grounding it doesn't matter which version it is.

HRM;has a separate overdrive set of tone controls on a daughter board
low plate/high plate; the low plate has 100k plate resistors the high plate has 150/220
classic/skyliner tone stack; Bass 250k- Middle 100k- Treble 100k skyliner has 500k-250-250 pots


M

Perfect - Thanks!