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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Fri Dec 06, 2013 2:34 pm
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Nikola Tesla wrote:
That's exactly what I was thinking about, 50 or 60Hz in Norway?! :?:

This can play a big role. Voltage wise step down is usually fine as long as power of the transformer is adequate, but the Hz issue....?!?? :idea:


I have two transformers both at 1000W, which is more than enough, the Deluxe is rated at max 100W consumption. The wall outlet in Norway is 60Hz, but the transformers have 50Hz out.
Do not think this is the problem ...


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Fri Dec 06, 2013 2:40 pm
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Hz in equals Hz out, so if you have 60 from the outlet, the trans will put out 60. If the trans is rated for 50 Hz, this is good, as the lower freq rating means that it will work equally well at 60 Hz. The lower the Hz rating, the beefier the trans.

Being as how the amp works fine on one channel, I think you can eliminate power and reverb as the problem. The low reverb is either normal, or a problem with the V1 circuit (Custom channel).

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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Fri Dec 06, 2013 2:54 pm
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shimmilou wrote:
Being as how the amp works fine on one channel, I think you can eliminate power and reverb as the problem. The low reverb is either normal, or a problem with the V1 circuit (Custom channel).


+1

It's an amp issue of some persuasion, not a wall-socket or voltage problem (hopefully minor since the logistics of returning it for exchange would be convoluted at best).

Arjay

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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Fri Dec 06, 2013 5:27 pm
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shimmilou wrote:

Being as how the amp works fine on one channel, I think you can eliminate power and reverb as the problem. The low reverb is either normal, or a problem with the V1 circuit (Custom channel).


If V1 is good , probably there is not a defective resistor or capacitor but a solder missing / defective ?

This amps may have a printed circuit . A robot or worker forget a solder ?


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Sat Dec 07, 2013 5:22 am
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Yes, solder joints would be a good place to start checking. I hope that someone with a '68 CDR can chime in about the sound of the reverb on their amp, whether or not it is as strong on the Custom channel as the Vintage channel. :idea:

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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Sat Dec 07, 2013 8:12 am
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The unit I received is a domestic USA model marked 120V 60hz. I really don't think the Norway 50hz would affect only the Custom Channel. But stranger things have happened... Edit, seems you have 60hz in Norway.

My custom channel and vintage channel sound about equal for reverb and trem. Obviously, different frequency notes will react differently with the reverb but not so much as to make a great deviation between the channels. If anything, I would have expected weaker overall reverb on BOTH channels like that reported on the Custom Vibrolux but I have not found that to be the case.

I have not really sat down to compare both schematics (65 RI and 68 Custom) side by side yet. But it seems like it would be in the V1 circuit someplace where the problem lies, or immediately following. There really does not seem to be much difference between the 65 and 68 other than the tone stack, the link to the reverb, and the reduced neg feedback.

The schematic shows a link going from the grid(and plate) of V1B to the plate of V2B (TP9 to TP16) which does not exist on the 65RI. You might look at that for bad solder joint. Also, the small link between plate of V1B TP11 and grid of V1B TP9.

Sorry you are having issues with that. I'm happy with mine as it does NOT have the issues of the Custom Virbrolux (I worried about that) and once I get a good A/B switch, I will be able to quickly switch between channels. Actually my preferred method since amp manufactures tend to totally screw up on channel switching. 8)

email consumerrelations@fender.com and ask them nicely. They will send a schematic to you in PDF format that you can send to your tech.

Art


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Sat Dec 07, 2013 10:09 am
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Thanks very much to all of you, I greatly appreciate all the help!
shimmilou has already been so kind and provided me with the schematics. I've written MF and presented my problem. As soon as I get a bit more time I will take a look at the V1 circuit, look for bad soldier joints and look into Art1's suggestions.

Again, thanks everyone


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Sat Dec 07, 2013 11:30 am
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You might just have a look at that blue jumper wire between R53 and the connection with R12(R12 is missing on the CPR). That's the connection for the Fritz mod; I.E, Trem/Verb on both channels. Maybe a bad connection there?

Image


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Tue Dec 10, 2013 11:24 am
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I've been looking for bad solder joints and checking Art1's tip without luck.
What I find strange is that I have no blue jumper wire between R53 and the connection with R12 as t-lux is describing and the photo is showing. I'm not an expert on schematics, but the one I received from shimmilou does not show a jumper wire between R53 and R12 either ? I think the schematics must be for the export model, I have the domestic, but I guess that should not matter.
Here's a few photos of my 68CDR.

Image
Image
Image


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Tue Dec 10, 2013 1:14 pm
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It looks like Fender has revised the tremolo circuit yet again. The opto-roach is back.

Arjay

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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Tue Dec 10, 2013 1:21 pm
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Retroverbial wrote:
It looks like Fender has revised the tremolo circuit yet again. The opto-roach is back.

Arjay


Keep in mind mine is not the export version, I think the tremolo was only modified for the export version because of RoHS ...


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Tue Dec 10, 2013 2:09 pm
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SunKing wrote:
I've been looking for bad solder joints and checking Art1's tip without luck.




You look for bad solder under the "off white" printed circuit board ?????

I guess not . It is this printed board for the reverb.


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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Tue Dec 10, 2013 2:41 pm
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Art1 wrote:
T...The schematic shows a link going from the grid(and plate) of V1B to the plate of V2B (TP9 to TP16) which does not exist on the 65RI. You might look at that for bad solder joint. Also, the small link between plate of V1B TP11 and grid of V1B TP9....


That wire only connects the two Plates (V1B and V2B), and it only crosses the grid wire of V1B it is not connected to V1B grid.

That connection is where the two channels are connected together so that both have reverb. On the originals, the Plate of V1B would have connected to the PI after the reverb, so no reverb on the normal channel.

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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Tue Dec 10, 2013 2:59 pm
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Look at this picture, in the upper left corner, where the wires come from the first two tubes to the circuit board. Each tube has six wires that go to the circuit board, labeled "3, 2, 1, 8, 7,and 6". The right-most wires for both tubes, marked "6" on the board, should have continuity between them, maybe a trace on the bottom of the circuit board. Be sure that the amp is off and caps discharged before checking for continuity. By continuity, I mean close to zero ohms, very low resistance, as if the two wires are connected (they should be).

SunKing wrote:
...
Image...

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Post subject: Re: 68 Custom Deluxe Reverb problem
Posted: Tue Dec 10, 2013 4:01 pm
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Look carefully each pin on tubes socket to be sure it have solder.


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