Left channel of preamp does not work - Audio Players & Recorders

Yes amps buzz when something gets near them - say a pen or probe and if you know what it is safe to touch a finger! Fortunatly for you the left channel is the same as the right. So if you believe it's the pre-amp work backwards from the where the power amp connects to the pre-amp, going through the pre-amp stage by stage - prodding the parts. Remember a buzz in the right a buzz in the left! No buzz in the left but one in the right fault found!
Ignore the power supply it's nothing to do with that as it's common to both channels.

Chec whether balance control is adusted properly. Check the speaker connected to left channel. Check the power amplifier circuit of the left channel [a skilled work indeed]

If you are only getting sound from one channel try reversing the left and right channel cables from the turntable to the Preamp/Amplifier. If the sound switches channels in your headphones then the cartridge or the cables from the cartridge to the preamp in the turntable have a problem. If the same channel has sound, did not change channels, then you have a problem with the preamp or headphones. If the headphones work with another input, radio, cd, etc, then the headphones are good and the problem is in the preamp unit.

First, lets's determine if it's the amp or the preamp...

Swap the Left and Right channel cables between preamp and the amp with each other.

Did it stay on the right? = amp problem.

Now on the left? Preamp or source.

Plug any Line Level device (CD?) directly into the amp inputs. Work now? Preamp problem.

ALL sources? Preamp - toggle all controls, especially a Tape Monitor to possibly wipe of any built-up oxides in them.

There are just two causes, one is the preamp, which can be easily checked by putting the right channel jack in the left terminal. If the sound is normal, then it's likely that the cartridge in the deck is bad, or some wire is loose. However if the sound is still poor then the magnetic cartridge preamp in the amp has a fault. These are normally a single IC, which will have failed. Find the preamp by tracing the wires from the imput socket to the PC board, which may be alone.

Hi there.
Check for shorted speaker wires on left channel. If not, disconnect speaker wires and check to see if headphone jack works. If left works, you may have a blown speaker. If left still doesn't work, left power amp blown.
Thanks
Paul

It sounds like the preamp section is working but the power amp is not. Look at the power supply section and see if it is getting power to the power amp and if ok check the power transistors or IC.

Connect a set of stereo RCA cables from the 'Output 2' on the Hafler to the line imputs on the Sub.Turn on the '1+2' output switch on the Hafler and rock out!

It sounds like the preamp wire that carries the left channel signal between the HU and the 2ch amp has an issue. Here's two quick things to check.

1. Check that both ends of the left preamp cable between the deck and 2ch amp is not loose or disconnected.
   
2. Swap the left and right preamp connections at the amp. If the issue stays with the left channel, the issue is with the amp. If the issue moves to the right channel, the issue is with the preamp cable or the HU's preamp output.

Let me know what you find out!

Hi i don´t speak a good Englis but i think what you have a problem whit a filter in the preamplifier, just in the final amplification block, open it end check for any spill o exploded filter