2nd Generation 50W ODS Period correct Layout

[talbany]

Here is a Layout of a period correct 2nd Generation ODS 50W specimen,complete with part numbers for cap types, resistor types, type coax with specs, FET # for cross referencing and other valuable info.. If you have any questions please feel free to ask. However the source of this info and the series # of this amp and its whereabouts etc must be kept confidential due to request, so don't ask for pictures, Schematics or relevant information pertaining to this particular amp here or in a PM..Thank You!!
This is more than enough info to build a wonderful sounding 2nd generation ODS with all correct specs..Good Luck!!

For the sake of accuracy & confusion I recommend we refrain from calling this a so called 70's amp since we now have the info.. (we don't call 124 an 80's amp) same applys here, it's simply a 2nd generation ODS..
To Clarify
2nd generation "pre-classic" tone stack (1975 – 1978):

Treble: 500KL pot / 510pF treble cap
100k slope resistor
Mid: 250KA pot / .01 mid cap
Bass: 1MA pot / .1 bass cap / .002 soldered between the terminals 2 and 3 of the bass pot and .02 cap soldered between terminals 1 and 2 of the bass pot / 10K tail
Also notice cap types are not the same throughout

When the 2nd generation was manufactured
- pre production ODS with the 3 step OD switch (1968 - 1972)
- 1st generation (1972 - 1975)
- 2nd generation (1975 - 1978)
- 3rd generation (1978 - 1979)
- transition generation (1979 - 1981)

Also attached are pictures of #40 to help w/Lead dress and other references pertaining to layout..
These really are WONDERFUL sounding amps and recommend them highly!!

Enjoy All..:D :D

Tony

[talbany]

More 40 pictures and Steve Lukather's 2nd Generation ODS

Tony

[Structo]

That really looks nice Tony.
As one that has ventured into Visio just a bit, I know how much work one of those layouts is so thank you very much for your effort.

That should answer a lot of questions.

[mlp-mx6]

Tony,

Many thanks!

Michael

[markusw]

Thank you so much!

Take care,

Markus

[dimitris]

Thank you so much Tony.Very nice and detailed layout.

[dreric]

Tony

Thank you very much............ this is way cool

Eric

[Drumslinger]

Tony,

superb sir and many thanks.

[ic-racer]

Nice!

Do you have a serial number range for this circuit?

[Tonegeek]

Man, that is nice. thanks much!

[M Fowler]

Great work Tony thank you very much.

[bigmik]

thanks tony ,awesome job

[ToneMerc]

Thanks Tony, I'm all dressed up (minus the Calrad relay) and no where to go. I just need a better chassis than's what's available and I'm ready to pull the trigger.

Mike

[talbany]

Nice!

Do you have a serial number range for this circuit?

IC

The roundabout range is between #010 and #060.


Before are the 1st generation "pre-classic" ODS from #001 (Alexander's, he still has it) to around #010.

After 2nd generation "pre-lassic" comes 3rd generation "pre-classic" ODS from around #060 to around #075.

Then the transition generation "classic" ODS from around #075 to around #095

Then the 4th generation "classic" ODS from around #095 to around #140

Then the classic >>> "skyline" transition generation ODS from around #140 to around #155

Then the 5th generation "skyline" ODS from around #155 to around #200

Then the 6th generation "skyline HRM" ODS from #200 to current

originlly made "bluesmaster" ODS you will find in the #155 to around #200 5th generation series number range.

Hope This Helps!!..
Glad everyone is enjoying the layout..

Mike good Luck on that build
Tony

[David Root]

Wonderful work Tony! Thank you so much.