ODS #004 For Sale

[groovtubin]

http://www.youtube.com/watch?v=_kUTGz6o ... re=related

[crbowman]

4 was later upgraded in 79 to a classic specs by Alexander


Tony

This would seem to explain why the stack does in fact appear closer to the 80's classic style.

[Max]

The only thing not seen before (here anyway) is the straight voltage divider on the OD entrance

But isn't the usual 2nd and 3rd generation "funky OD entrance" another "typical feature" of a "typical" 70ies ODS?

As far as I know "Running On Empty" has been released in 1977 and I have really never seen or heard of a still 100% original (never modified by Alexander) Dumble ODS from 1975/76/77 with a "classic" tonestack and without the "funky OD entrance".

So I have my doubts that the preamp of David Lindley's "ROE amp" had technical specs like those shown in the scribble marcos posted.

As Tony posted that the series number of the 1st generation amp that Charly Bonat used for some recordings is #004, and as these scribbles show this series number, another possibility would of course be to listen to the 1st generation amp Charly used for the "1st generation clips" that I've posted in the reference thread to get an own impression if the 1st generation ODS used for these clips seems to have the "ROE tone". Do you think, this is the case? And in addition you could perhaps compare the tone of Charly's 1st generation clips in the reference thread with the tone of his 2nd generation clips (Elgam Collective) in the same thread in regard to their tonal differences as you perceive them to be.

In regard to the video groovetubin posted a link to IMO this for sure isn't a 1st (or 2nd or 3rd) generation "pre-classic" amp but a "transition generation classic ODS" (ratio control on the front, no manual/pedal switch on the front but still an accent switch on the front. Just like this one:

http://liveassets.rationalpathinc.netdn ... p51_so.jpg

Just look at the number of pots of the amp in this video and their positions.

Cheers

Max

[glasman]

Well, then that begs the question doesn't it?

What is a "good example of a 1st generation amp?

Probably Lindleys ODS #002. Gawd only knows whats in it. David has no clue but did say it was NOT a skyliner style stack.

or the Mosrite Dumble that I was into a year or so ago. The Mosrite was basically a blackface with tremolo feeding into a 2xEL34 Dynaco power amp (matched the Dynaco EXACTLY). It was built in the Dumbles Bakersfield days. The tranny was a HUGE dynaco with 4.2K primaries.

It was a HUGE sounding amp.

Gary

[Max]

Well, then that begs the question doesn't it?

What is a "good example of a 1st generation amp?

Probably Lindleys ODS #002.

The circuit specs of #002 - of course as they have been in 1977 - indeed would be of some interest for those here who are intrigued by the "ROE tone" (recorded live as far as I remember):

"Ben Harper: There are so many rumors as to what you're playing on that "Running on Empty" solo.
David Lindley: The slide guitar was a Rickenbacker-a Bakelite Rickenbacker- and the amp was the Overdrive Special #2, the orange-light one."

http://ampgarage.com/forum/viewtopic.ph ... 679#105679

Cheers

Max

[jelle]

I have done this one a while ago. It is quite gainy.

Jelle
It's no surprise to me that the 100K voltage divider would be the main reason for the higher gain structure..Jelle can you elaborate further on the tone stack you used ..How it functioned, how was the clean channel..Did you like the amp..

Thanks

Tony

Sorry, been busy. I used the posted schem and the cleans are nice. The od did not sound great. I believe that the schem is not 100% correct like max stated.

Overall a fun circuit but needed help to sound good.

[crbowman]

I have done this one a while ago. It is quite gainy.

Jelle
It's no surprise to me that the 100K voltage divider would be the main reason for the higher gain structure..Jelle can you elaborate further on the tone stack you used ..How it functioned, how was the clean channel..Did you like the amp..

Thanks

Tony

Sorry, been busy. I used the posted schem and the cleans are nice. The od did not sound great. I believe that the schem is not 100% correct like max stated.

Overall a fun circuit but needed help to sound good.

Thanks Jelle!
Appreciate the insight.
Any hints on where you think the schems need to be corrected?
I'm still planning on giving this one a spin.

[jelle]

For starters...too much gain combined with too much bass .... Does not work. I very much doubt that the OD entrance is correct.

Having said that, I have played some Dumble ODS amps that were very gainy and very tasty sounding. But they were built/modded later than this very early specimen. Unless...this one was modded too lateron... I'll probably never know.

[Structo]

Some of those old rockers like Lindley probably don't have a clue to the technical side of what's in their amp(s).
They may repeat something that they are told by the builder but unless they are technically inclined, they just say some words that may or may not be true or accurate.
I mean really, does David Lindley know what a Skyline stack is?

Many, many pro musicians are more artistic than technician so they just know when it sounds the way they want it to.

But without them we would have nothing to chase tone wise so rock on.

[marcos]

Jelle,
thank you for responding. I have always had doubts about the
OD entrance in the schematic. Maybe the series resistor in the OD entrance and the resistor in series with the OD level pot were mixed up?
820 K /100 K voltage divider in the OD entrance would make sense IMO.

Marcos

For starters...too much gain combined with too much bass .... Does not work. I very much doubt that the OD entrance is correct.

Having said that, I have played some Dumble ODS amps that were very gainy and very tasty sounding. But they were built/modded later than this very early specimen. Unless...this one was modded too lateron... I'll probably never know.

[David Root]

The schematic doesn't shown snubbers on V2. Could that be an omission, like the PI entrance cap?

As far as I can tell, the Overdrive Deluxe doesn't have snubbers on V2 either.

[jelle]

My guess is that there were no snubbers.

[ToneMerc]

I left the snubbers off my bastard 004/Deluxe and used a .005 PI ent cap.

TM

[David Root]

Thanx guys. I thought not as well, just wondered. TM, how does yours sound? I see you built a 100W version, assuming those are 6L6s.

I'm finishing a 50W, will post it soon.

[ToneMerc]

Thanx guys. I thought not as well, just wondered. TM, how does yours sound? I see you built a 100W version, assuming those are 6L6s.

I'm finishing a 50W, will post it soon.

David, it's a quad of 6V6s ( around 405V) with Marshall output iron. Sounds great with master up around 5-6, my fav of then early circuits I built.

TM