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Post subject: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 3:59 pm
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I have a NEW 65 twin reverb which has a noticeably loud hum even if volumes are turned down to 0 and nothing connected to it... The user manual mentions that there is a HUM BALANCE ADJUSTMENT control "somewhere" which I can turn back and forth to get the least amount of hum.. Do you know where this control is? I can't find it. Would this be the best approach to solve this? If not, what can I do? The thing is new!!! 2 hours of use at most!!


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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 4:03 pm
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OK, another one that is going to start a new thread for each and every problem with a brand new amp.

Return the damn thing! So far, it hums and has no reverb. What's next?

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 5:44 pm
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"HUM BALANCE CONTROL" on a re-issue blackface TR......?

:shock:

That's a good one.

:lol:

Arjay

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 5:58 pm
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Ummm, guys, the owner's manual DOES talk about a "hum balance adjustment":

http://support.fender.com/manuals/guita ... manual.pdf

"A. HUM BALANCE ADJUSTMENT - This adjustment minimizes the hum heard at the speakers
due to tube filament imbalance. Balance is usually adjusted only when tubes have been
replaced. •Adjustment Instructions: Turn the amplifier ON for 2 minutes with nothing
plugged into any of the INPUTS. Rotate the VIBRATO CHANNEL volume, middle, and bass
knobs fully clockwise and the treble knob fully counter-clockwise. Rotate ALL of the
NORMALCHANNEL knobs fully counter-clockwise. Switch OFF the REVERB and VIBRATO
effects. Then insert a slotted screwdriver into the BALANCE ADJUSTMENT control, (see
“A” in FIG. 1) and rotate back and forth to the position with the least amount of hum."

And no, it does NOT show up in the schematic. Not sure what is going on.

I agree that the amp should be returned to place of purchase for warranty repair/replacement.

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 6:06 pm
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bluesky636 wrote:
Ummm, guys, the owner's manual DOES talk about a "hum balance adjustment"...

And no, it does NOT show up in the schematic. Not sure what is going on.


Ayup. That's some PR guy's wishful thinking. Only the mid/late silverface models had that hum balance control (on the rear panel and clearly marked as such).

Arjay

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 10:00 pm
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Retroverbial wrote:
bluesky636 wrote:
Ummm, guys, the owner's manual DOES talk about a "hum balance adjustment"...

And no, it does NOT show up in the schematic. Not sure what is going on.


Ayup. That's some PR guy's wishful thinking. Only the mid/late silverface models had that hum balance control (on the rear panel and clearly marked as such).

Arjay


I realize all that. I just find it odd that no one has mentioned it being in the owner's manual until now and why it still is in there.

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 10:20 pm
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There is a pot shown on the schemo. Off the heater line taps. Anyone close to their TRRI to check this out? Prolly closer to the power indicator lamp, than the bias pot.

I gotta dig my TRRI outta storage (that's how much I've used it, the last year), after a grab something to eat.

http://www.webphix.com/schematic%20heav ... manual.pdf


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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 10:29 pm
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The problem is the name, that isn't a hum balance pot as found on some Fender models to balance the current draw of the output tubes, it is the heater hum adjustment pot. Big difference.

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 10:33 pm
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BMW2002Ti wrote:
There is a pot shown on the schemo. Off the heater line taps. Anyone close to their TRRI to check this out? Prolly closer to the power indicator lamp, than the bias pot.

I gotta dig my TRRI outta storage (that's how much I've used it, the last year), after a grab something to eat.

http://www.webphix.com/schematic%20heav ... manual.pdf


Well I'll be a monkey's uncle. You're right. I never noticed that in the TRRI schematic before.

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 10:44 pm
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shimmilou wrote:
The problem is the name, that isn't a hum balance pot as found on some Fender models to balance the current draw of the output tubes, it is the heater hum adjustment pot. Big difference.


Yes, it is a "hum" balance. What you are referring to is a "bias" balance pot. That is the difference.

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 10:44 pm
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"NOT SO FAST, MISTAH BOND!"

Hokey dokey, I just checked my 1999 TRRI and the schematic that accompanied the amp when I bought it (used) in January of 2001.

The operator's manual does make mention of a hum balance control and the illustration shows it as located just forward of the power tranny (when viewing the chassis from the bottom).

This adjustment pot is not present on my amp.

But wait, it gets curiouser......

According to the operator's manual:

Before making the adjustment, be sure that the hum or buzz cannot be eliminated by toggling the ground switch."

I am hear to tell you that is absolutely unequivocally, utter BULLSHIT.

The ground switch (long since deleted from these re-issue amps) was never connected to anything! It was real Carling switch but it was never wired into the primary power system. IOW, a cosmetic dummy.

So now what?????

:roll:

Arjay

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 11:00 pm
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Looking at Fender schematics, there is a "hum adjust" pot located in the heater supply circuit of some amps, and a "hum balance" pot located in the bias supply for the output tubes of some amps, and there is no "hum balance" pot on the TRRI, but the schematic shows a "hum adjust" pot on the heater supply. Isn't the hum adjust pot only accessible with the chassis removed, while the hum balance pot is accessible through a hole in the chassis? (that is, for the amps that have either) :?:

For example, Bassman schematic notes:

4. When installing new 6L6s reset hum balance for min hum.

The Bassman only has the hum balance for the output tubes and no hum adjust for the heaters. :idea:

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 11:08 pm
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Retroverbial wrote:
"NOT SO FAST, MISTAH BOND!"

Hokey dokey, I just checked my 1999 TRRI and the schematic that accompanied the amp when I bought it (used) in January of 2001.

The operator's manual does make mention of a hum balance control and the illustration shows it as located just forward of the power tranny (when viewing the chassis from the bottom).

This adjustment pot is not present on my amp.

But wait, it gets curiouser......

According to the operator's manual:

Before making the adjustment, be sure that the hum or buzz cannot be eliminated by toggling the ground switch."

I am hear to tell you that is absolutely unequivocally, utter BULLSHIT.

The ground switch (long since deleted from these re-issue amps) was never connected to anything! It was real Carling switch but it was never wired into the primary power system. IOW, a cosmetic dummy.

So now what?????

:roll:

Arjay


The manual I linked to (from the Fender website), makes no mention of a ground switch.

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 11:10 pm
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shimmilou wrote:
Looking at Fender schematics, there is a "hum adjust" pot located in the heater supply circuit of some amps, and a "hum balance" pot located in the bias supply for the output tubes of some amps, and there is no "hum balance" pot on the TRRI, but the schematic shows a "hum adjust" pot on the heater supply. Isn't the hum adjust pot only accessible with the chassis removed, while the hum balance pot is accessible through a hole in the chassis? (that is, for the amps that have either) :?:

For example, Bassman schematic notes:

4. When installing new 6L6s reset hum balance for min hum.

The Bassman only has the hum balance for the output tubes and no hum adjust for the heaters. :idea:


I think we are arguing semantics. Like arguing about tremolo and vibrato. :lol: :lol: :lol:

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Post subject: Re: Fender Vintage Reissue 65 Twin Reverb HUM ISSUE
Posted: Sun Jan 12, 2014 11:18 pm
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I am beginning to believe that Leo must have at least occasionally experimented with drugs. :shock:

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