Mainline, Channel imbalance [resolved]

[elgringo81]

The solder joints at 6 and 8 might be part of the problem.

The white wire leaving the coarse attenuator is not soldered at the attenuator.

Of the resistor values that I can read, they look to be in the correct places.

-PB

I have re-soldered 6 and 8
Also soldered the loose, white wire between 1-2 on the coarse attenuator.

Unfortunately, the problem is still there.

[elgringo81]

I have gone over each and every connector on both attenuators, cleaned up the tin and carefully re-soldered all off them, along with the 4x lower lugs.
This has not resolved the problem, there is still a channel imbalance unless I turn the Coarse Dial to 0dB.
With coarse dial set to 0dB, I can use the source volume to go from quiet to loud, without any channel imbalance.. It sounds very good..
Fine dial does not seem to be affected.

[Paul Birkeland]

I would suggest borrowing a meter that can more consistently read resistance values so we can continue debugging this issue.

[elgringo81]

Hello Paul.

I have resolved this problem.

Red wire coming from lower back lug on fine attenuator was incorrectly connected to lower front lug on coarse attenuator. !!It should have been connected to terminal 7 on coarse instead. Page 43 in the manual.!!

After I corrected this, the channels are totally balanced.

Thank you very much for all the help.

[Paul Birkeland]

Ah, that explains the odd behavior your were getting, good catch!