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Post subject: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 4:19 pm
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Hey guys

So I'm getting this white noise on the Reverb knob when I turn it up and down.

http://youtu.be/Q0h-lvge0Ns

I read some older threads on this, and carried out some the trouble shooting

thus far:

I replaced V2, V3, and v4 with brand new tubes (v4 I tried 2 different brand new tubes) ..Problem persisted.

Sprayed some contact cleaner for good measure (I don't have Deoxit, but I will get some ASAP)..problem persisted.

1 at a time I pulled v2, v3, and v4: V2, and v3 no change.

V4 when empty, the issue completely went away.

Does that tell me that the V4 socket is the issue?

(...or does it mean without a tube in V4, the Reverb has been killed whether the other components were tip top or not...in other words does v4 serve as a reverb 'off' switch with the tube out)

Thanks guys
Dave


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 5:00 pm
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V4 is the reverb recovery tubes , no V4 no reverb or noise coming from the reverb circuit . This do not mean V4 socket is defect .

Look you may have a bad wires going to your reverb pan / tank

Trouble is between V3 and V4 ; what do you have between those 2 tubes ? reverb pan and its wires. Check those , begin with new wires ; stereo wire with RCA plug may work


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 5:20 pm
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Thanks for the advice,

I forgot to mention the reverb tank and the footswitch was completely disconnected during the video clip. It was speakers only hooked up

...Which is pretty telling as well, I didn't even realize.


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 5:24 pm
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stratele52 wrote:
reverb pan and its wires. Check those , begin with new wires ; stereo wire with RCA plug may work


If you prefer to keep the amp original (thus preserving its inherent value), use only OEM-style braided-steel cables to connect the reverb tank. Original style replacements are available on Ebay from a seller named "potbelly". If your tank is bad, it's preferable to have it rebuilt rather than replace it outright.

If your cables and tank check as "good" with a ohmmeter, then I'd look for a problem within the reverb circuit itself. Aging carbon-comp resistors can attract and retain ambient moisture from the air and cause the spurious noise you've described. Those resistors should be visually inspected for any signs of cracking or fracturing and if found, replaced. The cathode-bypass caps of V3 and V4 should likewise be checked for any indications of DC leakage and/or oozing electrolyte. Replace any that exhibit marginal measurements or look wonky.

Arjay

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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 5:27 pm
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Hey Arjay

Thanks for the response.

..it came in last second there but the reverb tank and switch weren't connected when that video clip was shot...

has to be something in the chassis, maybe the verb pot?


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 5:28 pm
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ParksideDrive wrote:
Thanks for the advice,

I forgot to mention the reverb tank and the footswitch was completely disconnected during the video clip. It was speakers only hooked up

...Which is pretty telling as well, I didn't even realize.



With no reverb tank the amp could be noisy


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 5:29 pm
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stratele52 wrote:
With no reverb tank the amp could be noisy


+1

Arjay

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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Thu Feb 19, 2015 5:43 pm
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yeaaaa, but...

...I noticed the problem while playing when the amp was all put together, ...not after I started troubleshooting it :D

Meaning the issue is 'there with the reverb tank, there without the reverb tank'


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Fri Feb 20, 2015 7:06 am
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I wrote a complete check up procedure this morning and it disappear from the forum .

My reply was there before !!!

To bad :(


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Fri Feb 20, 2015 11:20 am
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ParksideDrive wrote:
Meaning the issue is 'there with the reverb tank, there without the reverb tank'


Be that as it may, Stratele is merely trying to tell you that when an amp's reverb circuit is unloaded (ie: the tank is removed), it's possible that noise may occur under that condition absent any other malfunction.

Arjay

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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Fri Feb 20, 2015 12:20 pm
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Fully understand, and appreciate.

But other than hooking the reverb tank back up and then telling you guys the problem persists (which was established it will, since I noted the problem when the amp was fully together and being played with the reverb tank connected)....saying "having the reverb tank disconnected could cause issues" -doesn't tell me what to do or where to look.

So again I really appreciate the help, Im trying to get to , "now that we have ruled out the reverb tank, based on the sound in the video clip, whats the next best course of action?" Or even more, "anyone heard something like this in the past re reverb knob? What was the fix?"


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Fri Feb 20, 2015 12:53 pm
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ParksideDrive wrote:
So again I really appreciate the help, Im trying to get to , "now that we have ruled out the reverb tank, based on the sound in the video clip, whats the next best course of action?"


Since you've elected to ignore my first response, I'm done here.

Good luck.

:roll:

Arjay

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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Fri Feb 20, 2015 12:59 pm
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Retroverbial wrote:
ParksideDrive wrote:
So again I really appreciate the help, Im trying to get to , "now that we have ruled out the reverb tank, based on the sound in the video clip, whats the next best course of action?"


Since you've elected to ignore my first response, I'm done here.

Good luck.


:roll:

Arjay


I agree


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Fri Feb 20, 2015 1:25 pm
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Fair enough I guess...

I think one of the hardest things to deal with here, is that the newbs like myself who come here for information are usually way out of their depth to begin with, but are hoping to learn via trial and error.

The skilled techs who know their sh** refuse to accept this, and go straight to the advanced info 'why not just properly read the schematic and repair the problem by isolating the coupling caps..."

Thats pretty much Q: "how do I play e minor?' A: "why don't you simply take the parent scale or either G Major or D Major and isolate the relative Tonic 6 chord or sub dominant second, and employ those...or you could simply build your voicing from the 1, flat 3rd, natural 5th, and flat seventh of the tonic major"

I know what all that means, you guys know what that means...but from the very nature of the question, the OP clearly knows very little, and is hoping for an answer in the most layman of terms. Like "put you middle finger here, and put your ring finger there"

If I knew how to read a schematic and properly identify and diagnose resistor issues, I wouldn't bring my inexperienced butt in here wasting your time. Id just be the knowledgeable tech that Im clearly not and solve my own problems.

So since Ive clearly pissed off Arjay (who helps tons of people out on here everyday)...anyone else want to try and explain my reverb circuit to me like a 12 year old guitar student? :)


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Post subject: Re: Reverb Knob Creating White Noise 67 Super Reverb
Posted: Fri Feb 20, 2015 6:00 pm
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ParksideDrive wrote:
Fair enough I guess...

I think one of the hardest things to deal with here, is that the newbs like myself who come here for information are usually way out of their depth to begin with, but are hoping to learn via trial and error.

The skilled techs who know their sh** refuse to accept this, and go straight to the advanced info 'why not just properly read the schematic and repair the problem by isolating the coupling caps..."

Thats pretty much Q: "how do I play e minor?' A: "why don't you simply take the parent scale or either G Major or D Major and isolate the relative Tonic 6 chord or sub dominant second, and employ those...or you could simply build your voicing from the 1, flat 3rd, natural 5th, and flat seventh of the tonic major"

I know what all that means, you guys know what that means...but from the very nature of the question, the OP clearly knows very little, and is hoping for an answer in the most layman of terms. Like "put you middle finger here, and put your ring finger there"
the problem here is that if you don't know what your doing and someone tells you to "put your middle finger here and your ring finger there" you could end up being shot 12 feet across the room and possibly dead. High voltage and current are not things to take lightly and if you don't understand or have the knowledge to perform what has been posted, you might be better off taking in for service by a qualified tech. No one wants to be responsible for someone else electrocuting themselves. Hope this helps. :wink:

If I knew how to read a schematic and properly identify and diagnose resistor issues, I wouldn't bring my inexperienced butt in here wasting your time. Id just be the knowledgeable tech that Im clearly not and solve my own problems.

So since Ive clearly pissed off Arjay (who helps tons of people out on here everyday)...anyone else want to try and explain my reverb circuit to me like a 12 year old guitar student? :)

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