124 low volume in clean channel (solved)

[martin manning]

Sorry, I was looking at the somewhat fuzzy picture posted above (not yours) and saw something that looked like a knob. I don’t think removing the trimmer will help. That layout is known to work fine. Still a mystery...

[dariez75]

What is best OD trimmer value?

[martin manning]

As recommended above, 220k into 100k trimmer with a 4k7 tail to ground is what I have in my 124-ish amp. It's set around 25k to ground, and it works very well. Those values (except the tail resistor) are common to 102 and 183 as well.

[dariez75]

As recommended above, 220k into 100k trimmer with a 4k7 tail to ground is what I have in my 124-ish amp. It's set around 25k to ground, and it works very well. Those values (except the tail resistor) are common to 102 and 183 as well.

I’ve changed the trim pot with a brand new 100k, as you advice me I set to 25k. The amp now has less difference between clean and od but saturation is very low. I can achieve the suitable saturated sound only setting the drive front panel pot to the max. Maybe is the real sound of #124 and for my player’s taste I need an high plate ...


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[martin manning]

You could go to a high plate configuration for a more grainy sound, and some have experimented with low-plate clean and high-plate OD (which I jokingly call a "Lojai"). However, the high-plate OD configuration will increase gain and therefore produce more OD volume. What you could try is dialing up the OD entrance trimer to get more distortion, and then increase the 150k going into the ratio pot to reduce OD output volume. My low-plate ODS is capable of some highly distorted sounds with its 220k/100k trim into OD1, and the standard values for the series resistors at OD2 input and output, but I do have a 100k Drive/Level pot, which reduces the signal going into OD2.

[norburybrook]

I was one of those who experimented with this ''Lojai'' in the end I went to full stock high plate all round. In these amps the pre amp effects the OD, they're not separate as some people think so whatever yo do to the clean will affect the OD.


For me personally the best 'rock' overdrive is the Bluesmaster..incidentally it has a great clean as well. Some one bought my BM after hearing it, I haven't replaced it yet.

It's very likely I will at some point.

M

[dariez75]

My first experience with Dumble ODS circuit was a Ceriatone OTS FM 50 Watt (#102 as you know). Clean is great but OD is fuzzy and less low frequencies (I’ll rebuild). That actually disappointed me, so after 5 years I’ve decided to build #124 low plate. As some people here I was looking for the Robben Ford sound and first ceriatone fm build was the most far thing from the real RF amp. IMHO #124 sounds pretty close to RF amp, and this surprise me lot early when I finished the amp. So, in general #124 sounds as I wish but the only hassle is the global clean low volume.
I keep reading every post in this wonderful forum and at the end the solution will come.



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[norburybrook]

#124 sounded nothing like Robben Ford to me, I changed mine over to #102 specs and it's a lot better in that respect.

If you're after the early 'talk to your daughter' tone I'd go with the bluesmaster. His sound now with the #102 is not like it was on that album.

Have a listen to some of the demo's I posted on the #102 versatile amp thread and you'll hear what the #102 sounds like.

here's the OD tone

https://soundcloud.com/marcus-cliffe/spell-solo



M

[dariez75]

#124 sounded nothing like Robben Ford to me, I changed mine over to #102 specs and it's a lot better in that respect.

If you're after the early 'talk to your daughter' tone I'd go with the bluesmaster. His sound now with the #102 is not like it was on that album.

Have a listen to some of the demo's I posted on the #102 versatile amp thread and you'll hear what the #102 sounds like.

here's the OD tone

https://soundcloud.com/marcus-cliffe/spell-solo



M

Wow M, the sound I want! So did you use the 102 spec?
I rebuild my ceriatone ots 50 fm using the layout you posted on 102!


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[norburybrook]

Yes, exactly as on the layout/schematic in the thread files. I didn't use the FET circuit, but everything else is exactly as is.

The OD is a bit toppy going from the clean sound I like but I just roll the tone back on the guitar to about 6 on my Humbucker tele. Some like the Dumbleator because it takes off some of the high end. I didn't use it on that recording just gtr straight into amp and added reverb/delay afterwards in the studio when mixing.

here's a link to the album if you liked that clip

https://marcuscliffe.bandcamp.com/


It's an easy change to go from #124 to #102, I made a 124 low plate classis, changed to skyline, then decided I didn't like it as much as the #102 so converted it to standard #102 specs all in about a week.

Marcus

[dariez75]

Question for all members: What are your setting for Dumble amp? Volume, tre, mid, bass, drive, ratio, master and presence


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[dariez75]

Yes, exactly as on the layout/schematic in the thread files. I didn't use the FET circuit, but everything else is exactly as is.

The OD is a bit toppy going from the clean sound I like but I just roll the tone back on the guitar to about 6 on my Humbucker tele. Some like the Dumbleator because it takes off some of the high end. I didn't use it on that recording just gtr straight into amp and added reverb/delay afterwards in the studio when mixing.

here's a link to the album if you liked that clip [emoji1]

https://marcuscliffe.bandcamp.com/


It's an easy change to go from #124 to #102, I made a 124 low plate classis, changed to skyline, then decided I didn't like it as much as the #102 so converted it to standard #102 specs all in about a week.

Marcus

Is this available on iTunes?



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[dariez75]

Nice mood in Italy maybe a solved the problem:
So, If I turn volume up to 7 (panel value)the clean level becomes quite the same of the OD with level (ratio) pot set on 12 O’clock (5 on panel). OD trimmer set on 25k and OD gain on 7-8.
Maybe I didn’t understand the way to set a Dumble overdrive

IMG_9979.JPG

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[martin manning]

Ah yes, that is something that is not well understood by those unfamiliar with ODS. More clean volume means more overdrive, since the "channels" are cascaded. One other difference in my amp is I have 330p snubbers on the OD stages. No need for a treble cut.

[dariez75]

Ah yes, that is something that is not well understood by those unfamiliar with ODS. More clean volume means more overdrive, since the "channels" are cascaded. One other difference in my amp is I have 330p snubbers on the OD stages. No need for a treble cut.

Did you mean 330pF despite 270pF?


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