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Post subject: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Aug 11, 2008 10:48 am
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I´ve rencently bought a new 65´Deluxe Reverb RI and found some odd noise when playing loud. Looking inside the amp I found a loosen screw, so problem solved.
The thing is I also noticed that the optical component (OP1, an optocoupler) was factory repleaced with a card (with OP amps and sourface mount components, Fender P/N073575 or 073578) that I assume plays the same rol.
I was wondering why was the OP1 repleaced with this card? It´s an electrical issue or something like that? Does this card take away the vintage vibe of that old optical tremolo design?
My Deluxe Reverb is an export model (I´m in South America).


Any bite on this?

Thanks in advance,
Javier.


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 07, 2011 3:01 pm
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Sorry to dig this up, but I opened my DRRI yesterday and I also spotted that extra board replacing the optocoupler.
Here are some pics
Image
Image


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 07, 2011 3:43 pm
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Didn't the original circuit cause a ticking noise in the amp, relative in speed to the tremolo setting? :idea:

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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 07, 2011 3:45 pm
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It could be that the circuit card assembly replacement has less propensity to cause the nefarious "trem tick" than the opto-isolator roach.

Arjay

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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 07, 2011 9:52 pm
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After looking on internet I decided buying some optoisolators (Can´t remember, maybe at All Parts or somewhere else) to replace this card. The opto is very cheap.
I recommend you do the same, since the amp sounded far better when the vibrato is engaged. With the card it sounded dull (some roll off in highs), general loss in tone.

Taking the card out involves some cable desoldering. And for soldering the optoisolator back, just respect the lamp and photo resistor sides clearly marked on the board (no polarity on the lamp/photo resistor). Obviously you have to turn of and disconnect the amp from the socket in order to open it and don´t get killed, don´t be a kamikaze.

An easy way (without opening it) to know if your amp have a card or opto vibrato driven circuit is to turn back and forth quickly the speed knob while playing a sound or chord: if the change in speed is immediate, then you have the card on it. Otherwise the change in speed kind of hangs up a bit and then become stable after a second or so (like the photo resistor can´t read the lamp instantly, I believe).

Just try it, you won´t regret.

Good luck,
Javier.


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 07, 2011 9:56 pm
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Nice pics of the innards.



SOLID!


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 07, 2011 11:30 pm
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TTSC wrote:
Nice pics of the innards.


Indeed. There's a lotta stuff in that amp that is not in my mid-90's DRRI. That shield for the speaker jacks looks vewy vewy weahd. I also have the "dummy" polarity switch on the rear panel.

Arjay

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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Tue Feb 08, 2011 6:29 am
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jgayub wrote:
After looking on internet I decided buying some optoisolators (Can´t remember, maybe at All Parts or somewhere else) to replace this card. The opto is very cheap.
I recommend you do the same, since the amp sounded far better when the vibrato is engaged. With the card it sounded dull (some roll off in highs), general loss in tone.

Taking the card out involves some cable desoldering. And for soldering the optoisolator back, just respect the lamp and photo resistor sides clearly marked on the board (no polarity on the lamp/photo resistor). Obviously you have to turn of and disconnect the amp from the socket in order to open it and don´t get killed, don´t be a kamikaze.

An easy way (without opening it) to know if your amp have a card or opto vibrato driven circuit is to turn back and forth quickly the speed knob while playing a sound or chord: if the change in speed is immediate, then you have the card on it. Otherwise the change in speed kind of hangs up a bit and then become stable after a second or so (like the photo resistor can´t read the lamp instantly, I believe).

Just try it, you won´t regret.

Good luck,
Javier.


Thanks for the info! Maybe I will!


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Tue Feb 08, 2011 7:54 pm
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Here are two sites where you could find the part.
I purchased 3 or 4 at Music Parts Guru (http://www.musicpartsguru.com/) since they have the original Fender part (Optoisolator Assy 65 Twin P.N. 003-7836-000) for uss10 each 3 years ago. It worked great.
The other site is (http://www.tubesandmore.com/) their part code is R-VOP1020, is not the original but they told me it works on the Deluxe Reverb.

Hope it helps,
Javier.


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Thu Feb 28, 2013 2:03 am
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Hi Javier,

Many thanks for sharing your findings and experiences regarding the recent version of DRRI.

Last week I bought a DRRI, European version with a digital vibrato circuit in it. After reading your post, I decided to challenge my soldering skills and replace the digital circuit wit a proper opto coupler. So far I managed to remove the digital circuit completely without any problems. But, as to the extra resistors added by Fender to eliminate the digital noise, I am not sure which ones should be removed. I see resistors soldered directly to following valves:

V1 pin 2 and 7
V2 pin 2 and 7
V3 pin 7
V4 pin 2 and 7

Are these all the extra resistors you mentioned? Are there any other components to be removed or replaced so that the traditional vibrato works properly?

Any guidance would be highly appreciated.

Many thanks in advance,
Ad


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Thu Feb 28, 2013 2:27 am
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Neither of those tubes have anything whatsoever to do with the tremolo circuit. Thus, the components soldered to the pins of those respective tube sockets have no function in creating or regulating the tremolo effect.

The V5 tube is the driver for the tremolo.

HTH

Arjay

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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Thu Feb 28, 2013 3:56 am
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Hi Arjay,

Thanks for your response.

Yes, you're right, the tubes V1 - V4 have no relation to the tremolo circuit.

As far as I read in the forums, Fender added the extra resistors only to eliminate the noise caused by the new digital tremolo circuit. They have nothing to do with the tremolo circuit itself. As I saw the resistors which are directly soldered to the grid lugs of the V1-V4, I thought these are the resistors in question. I am not sure though.

Cheers.
Ad


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Sun Mar 03, 2013 6:17 pm
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Retroverbial wrote:
TTSC wrote:
Nice pics of the innards.


Indeed. There's a lotta stuff in that amp that is not in my mid-90's DRRI. That shield for the speaker jacks looks vewy vewy weahd. I also have the "dummy" polarity switch on the rear panel.

Arjay


I wonder if that is a shield or an insulator?

Art


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 16, 2015 9:13 am
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Hi guys,

Is there any scheme or guide for turning back to the classical optocoupler tremolo? My technician have nearly all components.

Mine has digital tremolo circuit too and it causes noisy pops on low volumes.

I'm looking for your replies :)


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Post subject: Re: 65´Deluxe Reverb Reissue vibrato
Posted: Mon Feb 16, 2015 4:29 pm
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Hi orcunaras,

I doubt that the new tremolo circuit is causing any noise, odds are that it is a tube causing the noise. A "technician" should be able to figure out the circuit if you feel the need to change it back to the original. The original circuit was infamous for the "trem-tick" noise, but maybe the new circuit was introduced because of the need for RoHS compliance.

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