different OD channel

[richon]

anyone heard about using a different channel in the OD section?

maybe a "stage+cathode follower" to have a very light OD?

is there a Dumble with this channel allready?

[Teleguy61]

Search for Ripper.

[10thTx]

maybe a "stage+cathode follower" to have a very light OD?

Look at the Double C amp schematic for an idea. You can use that OD section with a more typical Dumblish preamp.

Here is a soundclip of the Double C amp:
http://soundclick.com/share.cfm?id=10391428

I've built all of these. Ignore the preamp and LTPI & power amp and look at the OD section only.

In the D-files, look under D-inspired amps for some schematics and layout that are editable.
https://tubeamparchive.com/viewtopic.php?t=17500

with respect, 10thtx

[10thTx]

And here are 3 more that I have NOT built

With respect, 10thtx

[richon]

I'm very interested in the DOUBLE C OD channel sound

it just what I have in mind...

can you explain more about the results of it and how different it sound to the OD channel in a "normal" Dumble?

[10thTx]

I am sorry but I have NO apples to apples comparison.

The best I can offer you in tone comparison is the soundclip I have already posted.

Obviously, the Double C amp has ALOT of topology different then Dumblish amps ............. so an appropriate comparison of just the OD sections can NOT be made.

I think the Double C amp sounded great and has nice sustain and was very touch sensitive to play. The amp does not have the blooming that a Dumblish amp would. It does not have the vowel tone a Dumblish amp would.


With respect, 10thtx

[richon]

Does it sound a little less modern And a little More classic Overdrive (alla Marshall) even of it has 6L6?

I mean, the dumble Overdrive sound awesome, But it sounds too much for lead guitar only (for me)

So i'm looking for a Overdrive with a riff capable sound

[da Geezer]

Here's the OD I use.

The 1x gain + CF is just as you describe, like a classic vintage Marshall-type OD.

Then the "More" added gain stage takes me into Dumble ODS world.

The "Clean" section (1st 2x gains & TS) on mine is a 5879>12AX7>CF>TS

Note that you would need to adjust the grid stoppers/pot values/Rk-Ck values, etc, to your tastes, but this gives the basic building block of something that actually works & sounds really good..

I love it so much, I've stopped building (for a while) & started actually playing my guitar more!

[tictac]

Don't see the point in the 470k/.02uF coming off the cathode follower.

Why not just direct connect to the tone controls?

TT

[martin manning]

That 470k//0.02uF NW takes out about 5dB at 100Hz, more below that.

[da Geezer]

Don't see the point in the 470k/.02uF coming off the cathode follower.

Why not just direct connect to the tone controls?

TT

That RC network started out as a tone shaper on the original HoSo56 amp (SoHo65 type tone, see the Hoffman Forum) & was 470k/.01uf to start, but that was a bit thin for me, so I upped the value to .02uf & liked the results (using my ears).
If I bridge across the network to bypass, I do hear a difference not to my liking, so I left it as is.

G

[richon]

is the CAP coming after the second stage of the clean channel a 47n or a 10n in your amp?


I was thinking to add a 470K/470p RC network before the GAIN pot of the OD channel... to avoid a fuzzier bass in the OD, right?

[da Geezer]

is the CAP coming after the second stage of the clean channel a 47n or a 10n in your amp?

The feed from the preamp on my amp comes off a bassman/JTM45 type tone stack, so no single coupling cap there. The whole preamp is basic bassman topology, but has a pentode (5879 or 5654) as V1, then gain stage, then cathode follower, tonestack.

I'm sure the Ripper OD+MORE would work fine with a typical Dumble pre in front (that's what is in at least one of Larry Carlton's amps, I believe).....you'd have to experiment with different coupler values to see what works best for you.

G