Hello all, I've read that the Dumbleator is necessary to add the extra final touch to the ODS tone. And I've noticed that anything in the effects loop does tend to smooth out the highs a bit, especially with overdrive engaged. The cables and loading of the Dumbleator circuit would tend to do that I'd think.
Recently in schematics such as this:
102_low_plate_classic__revision_2_123.pdf
there seems to be a 250pF/220k/250pF pi filter on the effects loop jacks internal link, and the pi filter is bypassed by any connection in the loop. I haven't seen or heard of this filter until recently. Is this filter meant to duplicate the Dumbleator effect on the tone, with nothing plugged into the effects loop? I did a search to try and find the discussion, but was not successful. Maybe you guys have a fancy name for it and I'm not hip to it yet.
If you could link to a discussion on this pi network, it would be very helpful, or a simple explanation would help as well. Thanks in advance.
Dumble 102 newbie question (effects loop)
Moderators: pompeiisneaks, Colossal
Re: Dumble 102 newbie question (effects loop)
It is meant to compensate for situations where no D'Lator is present. I got that particular arrangement from Shad who indicated that it was installed on a Bludotone 102 clone (Ojai?) he'd been inside of. It dumps a ton of high end. #124 has something similar, but just on the return. I honestly don't use it anymore and forgot it was in that layout. I prefer to just have the master bright cap on a switch, instead.
The whole problem with the bright cap is that when you're using the amp's master volume as an actual master the tone completely changes depending on how loud you are. The loop network is a nice fix for the amp being too bright at low volumes, but you then have the problem if it being too dark at high volumes. You can use dummy plugs or a short cable to defeat the network, but it's still kind of a kludge IMHO. Not enough graduation of the filter for practical use.
-Aaron
The whole problem with the bright cap is that when you're using the amp's master volume as an actual master the tone completely changes depending on how loud you are. The loop network is a nice fix for the amp being too bright at low volumes, but you then have the problem if it being too dark at high volumes. You can use dummy plugs or a short cable to defeat the network, but it's still kind of a kludge IMHO. Not enough graduation of the filter for practical use.
-Aaron
Re: Dumble 102 newbie question (effects loop)
Aaron, thank you very much for the excellent explanation. I plan to try the network tacked into an external cable, that way it can be inserted when needed. But this amp has such a vast amount of adjustibility, one minute I think it is too bright but another it is too warm. Very small adjustments of the controls makes for a huge difference in tone. It's going to take a long time to get a handle on this beast.aflynt wrote:It is meant to compensate for situations where no D'Lator is present. I got that particular arrangement from Shad who indicated that it was installed on a Bludotone 102 clone (Ojai?) he'd been inside of. It dumps a ton of high end. #124 has something similar, but just on the return. I honestly don't use it anymore and forgot it was in that layout. I prefer to just have the master bright cap on a switch, instead.
The whole problem with the bright cap is that when you're using the amp's master volume as an actual master the tone completely changes depending on how loud you are. The loop network is a nice fix for the amp being too bright at low volumes, but you then have the problem if it being too dark at high volumes. You can use dummy plugs or a short cable to defeat the network, but it's still kind of a kludge IMHO. Not enough graduation of the filter for practical use.
-Aaron