peavey classic 50 50 channel 1 resonance and presence not working

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kylealers
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peavey classic 50 50 channel 1 resonance and presence not working

Post by kylealers » Tue Nov 22, 2016 12:16 am

I recently bought a 50 50 power amp to use with my bass rig , it sounds amazing running my sans amp into it , I use it in 100w mono mode, my problem is the resonance and presence controls on channel one whether in mono or stereo mode seems to have no effect when turning them , where on channel 2 it makes a big difference, any help would be appreciated on what could be the cause of this, I have a bit of knowledge on tube amps , any advice would help, thanx I'm advance

Classic30inCincy
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Re: peavey classic 50 50 channel 1 resonance and presence not working

Post by Classic30inCincy » Tue Nov 22, 2016 7:43 am

1) De-Oxit on controls

OR......

2) Replace controls

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kylealers
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Re: peavey classic 50 50 channel 1 resonance and presence not working

Post by kylealers » Tue Nov 22, 2016 10:10 am

so I spray the pots with switch cleaner aerosol ?, the pots are not scratchy at all though

ksandbergfl
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Re: peavey classic 50 50 channel 1 resonance and presence not working

Post by ksandbergfl » Tue Apr 04, 2017 2:50 pm

according to the manual (found here: https://assets.peavey.com/literature/ma ... 301636.pdf), when the amp is run in Mono mode, only one set of controls will work.

"CHANNEL 2 LEVEL CONTROL (10)
Controls the output level of channel 2 when in stereo mode. Maximum output level is obtained with the level
control rotated fully in a clockwise direction.
NOTE: Not operational when in mono mode.
RESONANCE CHANNEL 2 (11)
Used to fine tune speaker enclosure low frequency response by varying the damping factor of channel 2 at
low frequencies.
NOTE: Not operational in mono mode.
PRESENCE CHANNEL 2 (12)
Used to fine tune speaker enclosure high frequency response by varying the damping factor of channel 2 at
high frequencies.
NOTE: Not operational in mono mode.

MONO/STEREO SWITCH (17)
Used to select mono or stereo operation of the amplifier.
NOTE: When in mono mode, only channel 1 inputs, outputs, and controls will function. Use channel 1 impedance selector, level, presence, resonance, and line out controls. Make sure BOTH standby switches are on (both green LED’s are illuminated)."

Hope that helps!

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Enzo
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Re: peavey classic 50 50 channel 1 resonance and presence not working

Post by Enzo » Tue Apr 04, 2017 11:06 pm

So try also cleaning the stereo/mono switch contacts.

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