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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Wed Jul 23, 2014 8:55 am
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Also, that tank is only 30 dollars on eBay!


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Wed Jul 23, 2014 10:20 am
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Please post your results after swapping the tank out.

Arjay

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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Wed Jul 23, 2014 3:31 pm
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Retroverbial wrote:
Please post your results after swapping the tank out.

Arjay


I surely will!


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 5:49 pm
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I'm back on my reverb quest again after stumbling on to a fender brand video for my amp. The reverb sounds about the same as mine, but there's a short close up of the front panel and it was on 3. At 3, mine is so weak it's barely audible! So I got restless and have nothing else to do tonight anyways so I started playing around again. One thing I did notice is that in v4 (which is reverb recovery, yes?) there is a 12ax7-r but the tube chart says 12ax7-a. Does that sound right or are the two interchangeable? Every other socket that requires a 12ax7-a has a gt-ecc83-s but that's just Groove Tube's name for a 12ax7 right? So what's with the 12ax7-r? Either way, I will probably have access to another unit tomorrow so I'll be able to compare once and for all in person.


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 6:18 pm
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Your tube array is correct. However, you may yet have a bad tube in either the driver or recovery circuit (respectively, V3 and V4).

Arjay

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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 6:31 pm
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Retroverbial wrote:
Your tube array is correct. However, you may yet have a bad tube in either the driver or recovery circuit (respectively, V3 and V4).

Arjay


I think v3 is okay at least because I swapped it with one of the other identical ones with no change in sound. I don't have another tube to swap v4 with and am assuming the using one of the 12ax7-a's isn't gonna be the same as the 12ax7-r. It isn't microphonic anyways, but that would manifest as a different problem anyhow I'm assuming.


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 6:48 pm
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There prolly isn't that much difference, for reverb recovery, between the 12AX7A and 12AX7R. As long as both are strong and quiet.

V3 maybe the reverb driver tube. I don't have a schematic of the new '68 Deluxe Reverb Custom amp, but this tube prolly is a 12AT7 and not a 12AX7-type. Be sure you have a 12AT7 in that position, if this tube is a reverb driver tube.


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 7:38 pm
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BMW2002Ti wrote:
There prolly isn't that much difference, for reverb recovery, between the 12AX7A and 12AX7R. As long as both are strong and quiet.

V3 maybe the reverb driver tube. I don't have a schematic of the new '68 Deluxe Reverb Custom amp, but this tube prolly is a 12AT7 and not a 12AX7-type. Be sure you have a 12AT7 in that position, if this tube is a reverb driver tube.


I dunno why I said V3, I meant V4 is reverb driver and it does have a 12at7 in it so tube configuration is 100 percent okay. I just swapped v5 12ax7-r with the tremolo 12ax7-a and you're right, there wasn't any appreciable difference. That tremolo also didn't change. I guess that means that it definitely isn't the tubes then. Makes sense, V4 is also the tremolo gain stage and it works fine. So when I'm out of town tomorrow there's a few places I can hunt down another 68 custom. If there really is a difference in reverb then I'll be confident of the problem and take it in for servicing / exchange on Monday. At least now I've troubleshooted a lot of possible causes.


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 9:02 pm
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No, V3 is the reverb driver and should be a 12AT7, while V4 is the reverb recovery and should be a 12AX7.

Any 12AX7, regardless of the ending letter is interchangeable with any other 12AX7, as well, ECC83 is the same as a 12AX7. ECC83 is the European designation for 12AX7. ECC81 is the European designation for 12AT7.

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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 9:51 pm
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shimmilou wrote:
No, V3 is the reverb driver and should be a 12AT7, while V4 is the reverb recovery and should be a 12AX7.

Any 12AX7, regardless of the ending letter is interchangeable with any other 12AX7, as well, ECC83 is the same as a 12AX7. ECC83 is the European designation for 12AX7. ECC81 is the European designation for 12AT7.


Oh uh, maybe I need to play around with this more. Forgive my ignorance, I've really never poked around with tube amps before until the last few months, only played them. Does V3 mean the third tube left to right then? All my tubes match the chart inside the amp still but maybe I've swapped the wrong ones testing then. I guess by my logic v3 would be the 6v6 so maybe I have it backwards?


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 10:30 pm
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As is the case with nearly all Fender amps, counting right to left looking at the back of the amp, V1, V2, V3, etc. Typically V1 will be closest to the first set of input jacks. So, V3 is the third tube from the right, and should be a 12AT7, the reverb driver. The only other 12AT7 is V6, the phase inverter (PI), which is the last small tube closest to the 6V6 output tubes.

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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 10:32 pm
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The tube symbols as shown on the tube chart are numbered V1 through V9 and are arranged to be read from right to left.

V1 -- first and second gain stages for the "vintage" channel
V2 -- first and second gain stages for the "custom" channel
V3 -- reverb driver
V4 -- reverb recovery
V5 -- tremolo oscillator
V6 -- phase inverter
V7, V8 -- power tubes
V9 -- rectifier

Arjay

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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 10:47 pm
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Retroverbial wrote:
The tube symbols as shown on the tube chart are numbered V1 through V9 and are arranged to be read from right to left.

V1 -- first and second gain stages for the "vintage" channel
V2 -- first and second gain stages for the "custom" channel
V3 -- reverb driver
V4 -- reverb recovery
V5 -- tremolo oscillator
V6 -- phase inverter
V7, V8 -- power tubes
V9 -- rectifier

Arjay


Thank you! I definitely had it backwards but I've definitly eliminated the tubes as an issue without a doubt. Tomorrow / later today actually I will update on comparison if you guys aren't sick of my million posts ha.


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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Fri Jul 25, 2014 11:35 pm
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Most of us are here to help, Brian.

Let us know your findings.

Arjay

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Post subject: Re: Reverb problem with a new '68 Deluxe Reverb Custom
Posted: Sat Jul 26, 2014 6:23 am
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I always thought v1 for the custom like most amps v1 is usually for the first input. I have been changing tubes and it does effect the custom channel. Even v2 will have a impact on the custom you can really tell when I run dirt pedals through the custom channel.I followed this http://www.kcanostubes.com/content/fend ... mendations


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