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Hi gents, I just bought an old TL audio tube eq. Fedex managed to bend the right rack mount ear 90 degrees. Bent it back chipping the paint,but thats not my problem. It's two channels are out of phase. If I flip the channel phase on my board they are ok. It is a 2 channel two band parametric with 4- 12ax7's. They are all matching and my old tube tester says they are ok. Switched all 4 cables. Anyone know where I should look now? Thanks Glenn.

[Scott Dorsey]

wrote:
Hi gents, I just bought an old TL audio tube eq. Fedex managed to bend the =
right rack mount ear 90 degrees. Bent it back chipping the paint,but thats =
not my problem. It's two channels are out of phase. If I flip the channel p=
hase on my board they are ok. It is a 2 channel two band parametric with 4-=
12ax7's. They are all matching and my old tube tester says they are ok. Sw=
itched all 4 cables. Anyone know where I should look now? Thanks Glenn.


Okay, check one of them against a straight wire and see..... the thing about
an equalizer is it doesn't matter if it's pin 3 or pin 2 hot, as long as
the output is the same as the input. In your case, either you have a cable
miswired, or the output on one channel isn't the same as the input.

Find which one it is, then pop the case and look for rework that someone
might have done on that channel. That is where you found it.

But don't give up on cables yet....check them all out with an ohmmeter and
make sure they are the same, don't just swap them out.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[[email protected]]

On Sunday, November 11, 2012 11:10:49 PM UTC-5, wrote:
Hi gents, I just bought an old TL audio tube eq. Fedex managed to bend the right rack mount ear 90 degrees. Bent it back chipping the paint,but thats not my problem. It's two channels are out of phase. If I flip the channel phase on my board they are ok. It is a 2 channel two band parametric with 4- 12ax7's. They are all matching and my old tube tester says they are ok. Switched all 4 cables. Anyone know where I should look now? Thanks Glenn.

Ok I just got done working 10pm. I will go over tomorrow. Will swap 4 cables one more time. There is a eq in and out button for each channel. I will dbl check with the eq's out and go over the xlr's on the unit. GT.

[[email protected]]

On Tuesday, November 13, 2012 10:09:36 PM UTC-5, wrote:
On Sunday, November 11, 2012 11:10:49 PM UTC-5, wrote:

Hi gents, I just bought an old TL audio tube eq. Fedex managed to bend the right rack mount ear 90 degrees. Bent it back chipping the paint,but thats not my problem. It's two channels are out of phase. If I flip the channel phase on my board they are ok. It is a 2 channel two band parametric with 4- 12ax7's. They are all matching and my old tube tester says they are ok.. Switched all 4 cables. Anyone know where I should look now? Thanks Glenn..



Ok I just got done working 10pm. I will go over tomorrow. Will swap 4 cables one more time. There is a eq in and out button for each channel. I will dbl check with the eq's out and go over the xlr's on the unit. GT.

Last night I used the xlr ins and outs and the phase is good. I don't know why the 1/4" are out of phase. GT.

[hank alrich]

wrote:

On Tuesday, November 13, 2012 10:09:36 PM UTC-5, wrote:
On Sunday, November 11, 2012 11:10:49 PM UTC-5, wrote:

Hi gents, I just bought an old TL audio tube eq. Fedex managed to bend
the right rack mount ear 90 degrees. Bent it back chipping the paint,but
thats not my problem. It's two channels are out of phase. If I flip the
channel phase on my board they are ok. It is a 2 channel two band
parametric with 4- 12ax7's. They are all matching and my old tube tester
says they are ok. Switched all 4 cables. Anyone know where I should look
now? Thanks Glenn.



Ok I just got done working 10pm. I will go over tomorrow. Will swap 4
cables one more time. There is a eq in and out button for each channel.
I will dbl check with the eq's out and go over the xlr's on the unit.
GT.

Last night I used the xlr ins and outs and the phase is good. I don't know
why the 1/4" are out of phase. GT.


Wrong configuration of the leads soldered to the 1/4" input, resulting
in 180 degree polarity shift?

--
shut up and play your guitar * http://hankalrich.com/
http://www.youtube.com/walkinaymusic
http://www.sonicbids.com/HankandShaidri

[Mike Rivers]

On 11/20/2012 8:18 PM, wrote:

Last night I used the xlr ins and outs and the phase is good. I don't know why the 1/4" are out of phase. GT.

Sometimes they just made these things "wrong." Or if it's
old enough, it might have intentionally been wired "Pin 3
hot" which was the standard for a long time. This makes no
difference when connecting XLR to XLR but when mixing
connector types, it might just be what your present standard
is.

The best way to tell is to measure what you have.


--
"Today's production equipment is IT based and cannot be
operated without a passing knowledge of computing, although
it seems that it can be operated without a passing knowledge
of audio." - John Watkinson

http://mikeriversaudio.wordpress.com - useful and
interesting audio stuff