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It's a Hafler DH-101, recapped by me last February. Worked great until about a month ago, some issues with the left channel not related to the crappy push-putton switches.
But that's another story. I've got the back-up preamp in the system right now. It's a Kenwood C-1, also recapped by me but more like a decade ago.
Anywhoo, unlike the Hafler, it doesn't have be turned on to work. I have a headphone amp connect to one of the tape outs and the turntable playing through an external phono stage via the tuner input.
The Kenny is off. The power button is in the off position, no LED, etc.
But I'm still getting a signal to the headphone amp.
This is pretty cool, IMO. I've probably run a half-dozen preamps through my system over the last 15 years and none of them just passed the signal through without being powered up.
The problem is not that there is evil in the world, the problem is that there is good. Because otherwise, who would care?
Edits: 01/01/21Follow Ups:
Understandable considering it's age. It could probably be several things causing it.
I recapped about a year ago, so the caps are good. Same guy who sells the cap kit also has a resistor kit available. The resistors are all original.
The problem is not that there is evil in the world, the problem is that there is good. Because otherwise, who would care?
I had a Hafler DH-101 years back and did some minor upgrades to the caps. Very nice preamp even in stock form. I ended up getting a (So Called) better preamp with remote. So I sold the Hafler but got a call from the guy I sold it to, he was saying the right cannel was out. It was working 100% when I shipped it off, so I told him to send it back and I would fix it for free.
I got the preamp back and it had a dead right channel. Pulled out the scope put in a 1k sinewave, traced it back to a bad solder joint. This was in an area that I didn't touch with the upgrades. So I just resoldered all the solder joints and everything was fine. So he was all happy when he got it back and it worked perfectly.
So maybe your issue is due to a cold/bad solder joint. Hope this helps.
some more solder as well? Or do you remove all the old solder and add new solder. Novice here. Thank you.
nt
That the new solder has better flow wetting. This will insure good contact and no contamination from old solder that was originally on the pcb.
Heat it up and get the solder good and shiny.
The problem is not that there is evil in the world, the problem is that there is good. Because otherwise, who would care?
Channel imbalance and some distortion.
When I recapped it, I only recapped it. The resistors are all still original, and they weren't very good to begin with.
Haven't decided what to do with it yet, but I'm working on a solution to the preamp issue. The Kenny sounds OK, a little bright, but still OK, and it works like new.
The problem is not that there is evil in the world, the problem is that there is good. Because otherwise, who would care?
Edits: 01/02/21
You've got a preamp masquerading as a switch box.
-Rod
Many will pass the signal to the tape out with no power, but not the headphones.
However if you are running a headphone amp off the tape out then it is understandable.
So, yup, gotta run an external amp.
Thought about just running the phono stage direct to the headphone amp until the main preamp situation is addressed but I guess there's no point in that, right?
The problem is not that there is evil in the world, the problem is that there is good. Because otherwise, who would care?
headphone amp is fine as you listen to headphone
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