Hi everyone!
I have guitar preamp H&K Tubeman II. And, recently , I got a problem: when i begin to play, the sound is good and power, distortion is great too. But after 10-15 minutes sound changes and distortion doesn't same when i have started. It is more poor, hasn't power.
The preamp is not young, around 12 years old, but i use it seldom. I had supposed, may be electric capacitors have dried, and i have changed all of them. It didn't help.
I have iron and multimeter, but I don't understand electronic. I hope, may be you offer some advices what i can change or check in preamp.
Thanks in advance!
I have guitar preamp H&K Tubeman II. And, recently , I got a problem: when i begin to play, the sound is good and power, distortion is great too. But after 10-15 minutes sound changes and distortion doesn't same when i have started. It is more poor, hasn't power.
The preamp is not young, around 12 years old, but i use it seldom. I had supposed, may be electric capacitors have dried, and i have changed all of them. It didn't help.
I have iron and multimeter, but I don't understand electronic. I hope, may be you offer some advices what i can change or check in preamp.
Thanks in advance!
I'm no expert for sure, most of the people around here are way better and some of them are professionnal levels.. maybe my eyes are getting old, hard to find such 'intermitent' issue looking at pictures, I think
If you notice the problem only after the tube warm up, you have to look around the tube, using a magnifier to look at solder joints (while slightly move parts) can help you find it. May be just some dirt in the tube socket..
Note: I didn't take a look at the schematic but seeing that 450V capacitor on your picture makes me think of safety concern, please be sure to know about discharging capacitors as they could store enough current to hurt you, even with the amplifier not connected in the outlet.
If you notice the problem only after the tube warm up, you have to look around the tube, using a magnifier to look at solder joints (while slightly move parts) can help you find it. May be just some dirt in the tube socket..
Note: I didn't take a look at the schematic but seeing that 450V capacitor on your picture makes me think of safety concern, please be sure to know about discharging capacitors as they could store enough current to hurt you, even with the amplifier not connected in the outlet.
The preamp is not young, around 12 years old, but i use it seldom. I had supposed, may be electric capacitors have dried, and i have changed all of them. It didn't help.
Thanks in advance!
Things that go with age are electrolytics and valves.
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