Which ODS-style schematic to build?

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JeffG
Posts: 8
Joined: Sat May 06, 2006 12:20 am
Location: Kanas City area

Which ODS-style schematic to build?

Post by JeffG »

The thread title says it; I have a Fender PA100 chassis (Twin Reverb iron) that I'd like to rebuild as a Dumble-style amp. It will be a complete re-do, not trying to re-use the eyelet boards or really anything apart from the chassis, tube sockets and the transformer set. Oh, and the pilot lamp!

Which D-style schematic results in the best performing amp? I'm interested in having a really good clean tone, plus smooth overdrive. Do any of the ODSs incorporate reverb? (Since I have the tank and transformer from the PA100 available)

My resources with the PA100 donor: six noval sockets, four octal power tube sockets, and as I mentioned, the transformer set is that of a Twin Reverb.

Thanks,
Jeff
10thTx
Posts: 1863
Joined: Sat Dec 30, 2006 1:13 am

Re: Which ODS-style schematic to build?

Post by 10thTx »

I saved this from someone else's post some time ago. Some descriptions that may help you decide for yourself:

Non Hrm classiq EQ is the oldest style of dumble amp. A bit more rooted in the
raw fenderish tone. This is the amp that made his reputation. This
would be like early Lindley, Browne, Lowell George, the first
incarnation of his amps.
It can sustain like a mofo! It is a singing OD for sure.
Not much compression, very touch sensitive and dynamic....

Second the Non-HRM Skyliner EQ low plate is a variation of the above. Dumble modded
several of his older amps with a new tone stack he was developing,
know as the skyline eq because it's output viewed on a scope resembled
a city skyline.
It is a little less Fender but still a somewhat lower gain affair. It
has the same gain as the vintage amp but the new EQ is more "signature dumble" and a little less Fender. Improved cleans from th Vintage model.
It still sustains like a mofo, has a bit better string to string definition and is a little more refined in the tone shaping.

Non-HRM Skyliner EQ high plate is where he went next, same as above but now the
gain staging is not classic fender. It has more headroom, definition, and punch, more lively and responsive cleans, smoother OD, and a small bit of compression, very touch sensitive, lots of sweet singing tones.

HRM Skyliner EQ HRM stands for
"Hot Rubber Monkey". This is a second tone stack just for the OD
channel. It is more or less a Marshall style tone stack this allows tone
shaping of the OD independent of the cleans.
A real Dumble of this ilk would be called a Skyline HRM. Smooth as silk, goes from clean to mean like no ones biz. Transition
between is amazing. You can pick clean, a bit dirty, grinding, soaring, all
with your hand and all smoothly with definition. No rasp or buzz. Very refined. Gorgeous smooth tones. A little more compression that the above amps but not in a bad way. Very natural. The dynamic response is second to none. This amps feels like it breathes with you after awhile.
Smooth singing overdrive, completely dynamic, never any rasp or buzz, no IM distortion or other uglies.

Blues Master. Think raw early Fender/Marshall
tone on steroids. The tone stack is decidedly bassman territory,
however because of Dumbles many other difference it is far better IMO.
The cleans here are the best cleans I think I have ever heard, dumble
or otherwise. The cleans will sing and sustain!!! The OD is much less smooth and much less compressed than the above amps. It has some early Marshall vibe to it. Boosted cleans with this amp are to die for. The OD is a bit more raw and edgy then some of the other offerings but with boosted cleans you get the smooth side of things and with the OD you have a less polite and refined tone.

Somewhat like the first Dumbles, though different. Lots of punch, sustain and singing but not as smooth as some of the other offerings. This one can be thick and dense too. Not dark and crappy, just "meaty"...
Open clean cleans to mean and a little rude.
Big fat sick blues machine. Lots of character or soul. This amp will try and steal you girl.Like a tuxedo on a cowboy?.... It can play nice but it can still stomp in the dirt.
last is the same as above with the HRM OD tone stack which gives a little more tone shaping and refining in the OD section.

FWIW Non_Hrm Skyliner EQ High plater is basically the OTS

With respect, 10thtx
JeffG
Posts: 8
Joined: Sat May 06, 2006 12:20 am
Location: Kanas City area

Re: Which ODS-style schematic to build?

Post by JeffG »

Thanks for that, very helpful indeed.

From the descriptions posted, the HRM Skyliner EQ sounds like just what I'm after.

Is the D-HRM.sch file the best for building this? It is confusing, especially as some of the schematics reference a particular amp's serial number, and I don't know where that amp fits in the model evolution described in your post (example: D-101, -102, -183)

Thanks,
Jeff
10thTx
Posts: 1863
Joined: Sat Dec 30, 2006 1:13 am

Re: Which ODS-style schematic to build?

Post by 10thTx »

See IF this matches what you are looking for. CHECK and double check everything carefully. Make sure the schematic and the layout and the Bill of Materials all match appropriately.

http://ampgarage.com/forum/viewtopic.php?f=5&t=5481

http://ampgarage.com/forum/download/fil ... &mode=view

http://ampgarage.com/forum/viewtopic.php?f=5&t=3859

With respect, 10thtx

I've attached an editable SCH version that you can use to keep track of mods and tweaks IF you build this.

With respect, 10thx
You do not have the required permissions to view the files attached to this post.
JeffG
Posts: 8
Joined: Sat May 06, 2006 12:20 am
Location: Kanas City area

Re: Which ODS-style schematic to build?

Post by JeffG »

Thanks, I'll check them out!
jam-mill
Posts: 222
Joined: Sun Nov 17, 2013 8:37 pm
Location: San Diego, CA

Re: Which ODS-style schematic to build?

Post by jam-mill »

10thTx wrote: Mon Jan 22, 2018 12:25 pm I saved this from someone else's post some time ago. Some descriptions that may help you decide for yourself:

Non Hrm classiq EQ is the oldest style of dumble amp. A bit more rooted in the
raw fenderish tone. This is the amp that made his reputation. This
would be like early Lindley, Browne, Lowell George, the first
incarnation of his amps.
It can sustain like a mofo! It is a singing OD for sure.
Not much compression, very touch sensitive and dynamic....

Second the Non-HRM Skyliner EQ low plate is a variation of the above. Dumble modded
several of his older amps with a new tone stack he was developing,
know as the skyline eq because it's output viewed on a scope resembled
a city skyline.
It is a little less Fender but still a somewhat lower gain affair. It
has the same gain as the vintage amp but the new EQ is more "signature dumble" and a little less Fender. Improved cleans from th Vintage model.
It still sustains like a mofo, has a bit better string to string definition and is a little more refined in the tone shaping.

Non-HRM Skyliner EQ high plate is where he went next, same as above but now the
gain staging is not classic fender. It has more headroom, definition, and punch, more lively and responsive cleans, smoother OD, and a small bit of compression, very touch sensitive, lots of sweet singing tones.

HRM Skyliner EQ HRM stands for
"Hot Rubber Monkey". This is a second tone stack just for the OD
channel. It is more or less a Marshall style tone stack this allows tone
shaping of the OD independent of the cleans.
A real Dumble of this ilk would be called a Skyline HRM. Smooth as silk, goes from clean to mean like no ones biz. Transition
between is amazing. You can pick clean, a bit dirty, grinding, soaring, all
with your hand and all smoothly with definition. No rasp or buzz. Very refined. Gorgeous smooth tones. A little more compression that the above amps but not in a bad way. Very natural. The dynamic response is second to none. This amps feels like it breathes with you after awhile.
Smooth singing overdrive, completely dynamic, never any rasp or buzz, no IM distortion or other uglies.

Blues Master. Think raw early Fender/Marshall
tone on steroids. The tone stack is decidedly bassman territory,
however because of Dumbles many other difference it is far better IMO.
The cleans here are the best cleans I think I have ever heard, dumble
or otherwise. The cleans will sing and sustain!!! The OD is much less smooth and much less compressed than the above amps. It has some early Marshall vibe to it. Boosted cleans with this amp are to die for. The OD is a bit more raw and edgy then some of the other offerings but with boosted cleans you get the smooth side of things and with the OD you have a less polite and refined tone.

Somewhat like the first Dumbles, though different. Lots of punch, sustain and singing but not as smooth as some of the other offerings. This one can be thick and dense too. Not dark and crappy, just "meaty"...
Open clean cleans to mean and a little rude.
Big fat sick blues machine. Lots of character or soul. This amp will try and steal you girl.Like a tuxedo on a cowboy?.... It can play nice but it can still stomp in the dirt.
last is the same as above with the HRM OD tone stack which gives a little more tone shaping and refining in the OD section.

FWIW Non_Hrm Skyliner EQ High plater is basically the OTS

With respect, 10thtx
Came from here: http://ampgarage.com/forum/viewtopic.php?f=4&t=9601
John 15:12-13
10thTx
Posts: 1863
Joined: Sat Dec 30, 2006 1:13 am

Re: Which ODS-style schematic to build?

Post by 10thTx »

Thanks for posting that link. Very interesting read which I had not seen before. I think I got the info from someone who got it from that post & then reposted it.

It seems like there is always some level of mystery and controvesy around understanding these amps.

With respect, 10thtx
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