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my ta-30 has been sitting on the shelf for 6 months or so.
today, i finally hooked it up to my system.
now, i'm encountering a very strange problem.
i set the volume to the MIN, but the amplifier acts as if the volume
is at 9 or 10 o'clock position. very loud.
the volume pot is absolutely smooth and when I move it around,
i hear no scratch noise or anything. but from MIN position to
12 o'clock position, the loudness changes little as even at the MIN,
the amplifier is playing at the level as if it's at 10 o'clock or so...
i tried several sources (OPPO player, DAC, turn table) and checked
all my connections so i know the problem is the amplifier...
can anyone help?
Follow Ups:
fixed it - 12ax7s were apparently shot.
replaced with the old ones (thank god i still have them) and
it's all good :)
That sounds like you have a loose ground connection to your level control. When you swapped tubes, you restored the connection.
When you adjust the level control with no ground reference, it will only have the output impedance of the previous stage to work against, so you'll get very little range and no mute position.
Those original 12AX7 maybe ok. Could have been a bad contact issue between the tubes and sockets.
ok. so it's broken after all.
i tried two sets of 12ax7s so i know it's not the tubes that's shot.
here's the symptom
- i replace 12ax7s and power it up, and let it run for a few minutes.
- when i play music with volume at MIN, i hear very faint, almost inperceptible music that comes out of RIGHT speaker. from LEFT speaker, nothing.
- i let the amplifier for an hour or so and the volume still at the MIN, i hear music that comes out of RIGHT speaker, as if the volume is at 8 o'clock position.
- i let the amplifier run for few hours and the volume still at MIN, i hear music that comes out of RIGHT speaker, as if the volume is at 10 o'clock position. from LEFT speaker, no music comes out as it should be...
to sum it up, it seems that the RIGHT chennel is the problem. what kind of failure can cause these symptoms? can anyone help?
thanks
ps. let me know if u have additional questions about these symptoms. a pint of jack does wonders to my mood and pretty much ruins coherence to my writings...
Is this a new unit? Could be a cold solder point(s).
Or maybe a corroded volume pot that needs a good cleaning?
Aren't transistors alien technology?
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