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Post subject: 66 deluxe reverb need help please
Posted: Fri Nov 29, 2013 2:14 pm
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Joined: Fri Nov 29, 2013 2:04 pm
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Greetings

My 1966 deluxe reverb has developed a bad sound. There is a noise like water dripping in a cave when the reverb effect is used at any setting.

Its fairly loud and annoying.

My tech says there is a problem with the tremolo circuit affecting the reverb.

He says there is some kind of photo cell like device that oscillates the tremolo and it needs replacing.

I am having a problem finding that part.

The tech says i could make one from stuff at radio shack but i need the directions.

Any help or advice would be appreciated as i can not use the reverb at all and that kind of sucks.

Thank You forum members


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Post subject: Re: 66 deluxe reverb need help please
Posted: Fri Nov 29, 2013 2:35 pm
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peacefull, welcome to the Forum! :D


Does the vibrato section work ok? If so, I don't think you need another opto-coupler. If you do need one, they are readily available, online.

http://www.tubedepot.com/p-ldr-1.html

Does the frequency of the "dripping" change with adjustment to the vibrato's "Speed?" If not, I don't think it's the vibrato section. If so, you need to follow instructions on how to eliminate "ticking" in the vibrato section.

Fixing the "Ticking" in Fender Tremolo circuits

This is from the great electronics guru R. G. Keen. For an astonishing amount of information about tube amps and guitar effects check out his website, geofex.com.

• Fiberboard contamination: Dust, dirt, and junk can let the LFO signal leak into the audio path. Vacuum the dust and dirt away, and if it still persists, remelt the wax top and bottom with a hair dryer.

• Solder blobs from eyelets touching insulating board: Sometimes excess solder drips out the bottom of an eyelet and can intermittently contact the insulating board, can cause ticking. Remelt the eyelets and examine the board underneath for any blobs dripped down.

• Funny ground on some SF Fenders; On one of the signal tubes, the cathode cap was placed on the tube socket, and wired to a ground lug on the vibrato cancel jack instead of across the resistor on the fiberboard. The vibrato shares this ground line, and can the vibrato current can cause audible ticking in the audio path. Rewire the cap to another ground or relocate it to the board.

• Poor Signal wire layout: signal wires run too close to vibrato leads can pick up the LFO signal. Move them around and see if the ticking goes away.

• Bad repair/replacement foot switch cable: the Fender foot switch cable is not two conductor; it's single conductor shielded, plus single conductor. The reverb wire is shielded, vibrato wire is not. This keeps vibrato out of reverb. If you retrofit with two conductor shielded, you get vibrato ticking onto reverb audio.

• Sharp tick in vibrato oscillator: On neon/LDR Fenders, on the neon bulb side of the module there is a 10M to one side of bulb, 100K to the bulb; from the 10M straight across the board is the gnd point of the LDR. Put a 0.02 cap from 10M/bulb to the ground point; this works by filtering the output of the oscillator.

Good luck! Keep us posted.


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Post subject: Re: 66 deluxe reverb need help please
Posted: Fri Nov 29, 2013 3:59 pm
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Perfect, Thank you

Thats exactly what i was looking for and I just ordered the opto-coupler and some replacement knobs. :D

The tremolo works fine and the frequency doesnt affect the dripping sound.

I am going to work with my techs advice and see if it helps. I should be able to post about the results in a couple of weeks.

Thanks again BMW :)


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Post subject: Re: 66 deluxe reverb need help please
Posted: Sat Nov 30, 2013 8:08 am
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Posts: 1169
BMW2002Ti wrote:
.
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This is from the great electronics guru R. G. Keen. For an astonishing amount of information about tube amps and guitar effects check out his website, geofex.com.
.
.


thanks for the geofex tip. I'd never heard of them. Looks like a lot of useful info.

_________________
In my opinion Leo Fender had essentially perfected the guitar amplifier by 1964.


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Post subject: Re: 66 deluxe reverb need help please
Posted: Sun Dec 01, 2013 7:49 am
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Joined: Fri Feb 05, 2010 4:31 am
Posts: 14049
Location: Province de Québec, Canada
First, you tech is not very qualified .

Whitout hearing it myself not easy to say but ;

Reverb circuit may have some defective resistor or/and capacitor . I fix something like that in a Super Reverb fews weeks ago .


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