Audible Illusions Modulus L1 - Wheezy Channel

[NashAudio]

Yes, it's going to likely be something like a plate or cathode resistor, on a tube. Should be very close to the tube.

It's not likely power supply anyway- as that should cause noise in BOTH channels. As this is only one channel, that realistically exonerates the power supply.

Regards,
Gordon.

Hi Gordon:
My apologies for the late reply, as I had stopped looking into this thread after a couple of months of silence. Your suggestion makes sense to me. As noted, I've replaced all of the capacitors suggested by Jerry at AL but the problem persists. The sound is wheezy for about an hour and then crackling slowly disappears. Would you mind pointing me to the resistors you think I should test and/or replace? Perhaps the easiest would be to draw an arrow on a photo below:

https://imgur.com/iQkpWHn

 

[GordonW]

Hard to say without a schematic- but there's quite a few resistors near the tubes- maybe try pressing sideways on those one at a time, using a wooden or plastic stick, to see if you can cause noise.

Regards,
Gordon.

 

[TriodeLuvr]

Don't like this - even with a heat shield, that tube is too close to the cap(s).



Is this a Mute relay? Is it in series with the signal path, or does it shunt signal to ground?


My advice is to have a tech look at this. Shot-gunning parts isn't the correct way to fix it. You could do that practically forever and still not find the problem. There's also the significant risk of damage to the PCB from needlessly replacing so many parts.

Jack

 

[drentech]

Don't like this - even with a heat shield, that tube is too close to the cap(s).

View attachment 3038044

Is this a Mute relay? Is it in series with the signal path, or does it shunt signal to ground?
View attachment 3038048

My advice is to have a tech look at this. Shot-gunning parts isn't the correct way to fix it. You could do that practically forever and still not find the problem. There's also the significant risk of damage to the PCB from needlessly replacing so many parts.

Jack

Yes, that's the mute relay. The mute switch feeds signal to this relay and it's shunted to ground. It's a 15pin relay.
What tube are you using? It shouldn't be touching the 5uf cap.

 

[TriodeLuvr]

Yes, that's the mute relay. The mute switch feeds signal to this relay and it's shunted to ground. It's a 15pin relay.
What tube are you using? It shouldn't be touching the 5uf cap.

I can see that it's a 6DJ8, standard 9-pin miniature envelope.

 

[drentech]

I can see that it's a 6DJ8, standard 9-pin miniature envelope.

If I can be of further assistance, feel free to email me.

 

[Dr Morbius]

Wonder how it worked out for NashAudio, did he finally get it licked?