Eq's in Dumble 50w out of
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Eq's in Dumble 50w out of
Hi. I was hoping to not asking you guys for advice, but the Eq section in my Dumble 50w build is not active. I was wondering if this might be a quick fix, or I have to go through all the paths again? (I have, but I can't see any obvious reason for this.)
Re: Eq's in Dumble 50w out of
Loss of connection from tone stack to ground? PAB engaged?
I build and repair tube amps. http://amps.monkeymatic.com
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Re: Eq's in Dumble 50w out of
Do you also have much more gain than expected? Maybe the 510p treble cap is shorted somehow? Or indeed no ground connection on the tone stack. Some pictures might help.
Re: Eq's in Dumble 50w out of
The controls work in the jazz-settings, but non responsive in rock-settings?
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Re: Eq's in Dumble 50w out of
Maybe a failed R/J switch that is not closing in Rock setting, resulting in PAB? Measure resistance across switch pins.
Re: Eq's in Dumble 50w out of
The DPDT switch measure 0.5 ohms in all positions. A measured a new one, same result?martin manning wrote: ↑Tue Apr 16, 2024 10:00 am Maybe a failed R/J switch that is not closing in Rock setting, resulting in PAB? Measure resistance across switch pins.
All the switches seem to work, ecept the Treble/Bass/Mid- section in when in Rock-setting.
Re: Eq's in Dumble 50w out of
As Martin says, RJ not engaging correctly results in tonestack lift ie PAB. If you put a correctly functioning RJ switch in centre position you will hear the boost.martin manning wrote: ↑Tue Apr 16, 2024 10:00 am Maybe a failed R/J switch that is not closing in Rock setting, resulting in PAB? Measure resistance across switch pins.
Check the wiring around RJ and of course PAB manual switch and relay.
Re: Eq's in Dumble 50w out of
I changed the switch, the only difference is that the bass pot is giving some kind of reaction when turned, and the treble might have a relativelive weak reaction. Could it be a change to 500k pot will change anything?
Re: Eq's in Dumble 50w out of
Do you have slide or toggle switches installed?
Glenn
I solder better than I play.
I solder better than I play.
Re: Eq's in Dumble 50w out of
Ok. I've installed toggle where slide were shown on the layout, wired them like the layout and the switch operated "upside down" . Just wanted to make sure you had not done the same thing. You have the same type as the layout so you should be good, but wouldn't hurt to double check. On my builds (newer generation) ROCK setting TMB is much more effective than on JAZZ.
Glenn
I solder better than I play.
I solder better than I play.
Re: Eq's in Dumble 50w out of
Is there a very audible change in the pot ride or is it rather subtle?