Hey Blackstar....
I've got one of your HT studio 20s. Its been about 4 years since I picked it up second hand and I am now experiencing some tube issues.
The symptoms are as follows:
1) Clean channel started to whine a few days ago.
2) Checked the lead channel and it is completely without any gain at all.
3) When I twist the clean volume knob I am able to alter the pitch of the whining noise up and down.
4) Master volume still works and am able to turn up/down volume on command.
I've ordered some replacement tubes (both power and preamp) and will replace the preamp ones first to see if that is the problem.
Any feedback on this issue is appreciated.
Cheers from Seoul
Greetings from Seoul
Hey nick_s
Valves are still out for delivery...argh! Even had to cancel the power valves order due to stock issues.
There is some sunshine however...In my efforts to include a new multi fx pedal into my chain (which apparently caused the problem), I discovered how one can utilize the fx send port to bypass the preamp and still get a loud tone. This was the reason my dirt channel was not responding and my clean channel was whinging. After a few reroutes of the cords, I am back to a reasonable state of normal.
I'm still curious how a set of JJs will sound in the preamp....
Cheers from Seoul
Valves are still out for delivery...argh! Even had to cancel the power valves order due to stock issues.
There is some sunshine however...In my efforts to include a new multi fx pedal into my chain (which apparently caused the problem), I discovered how one can utilize the fx send port to bypass the preamp and still get a loud tone. This was the reason my dirt channel was not responding and my clean channel was whinging. After a few reroutes of the cords, I am back to a reasonable state of normal.
I'm still curious how a set of JJs will sound in the preamp....
Cheers from Seoul
My JJ ECC83 S valves arrived the other day. I replaced the stock TAD ECC83WA selected preamp valves with them.
The new tubes seem to sound slightly 'crisper' in clean mode. Head room is higher and the gain channel is much more defined and less muddy. The new tubes take my overdrive, flanger and chorus pedals differently as well. I have a Boss GE-7 equalizer pedal as well, but it seems to be less useful with the new JJ tubes.
I must say, I have learned more about valves, circuitry and signal chain during this episode than I expected to. I even bought a multimeter to explore the voltage, ohms and amperes dimensions further.
The new tubes seem to sound slightly 'crisper' in clean mode. Head room is higher and the gain channel is much more defined and less muddy. The new tubes take my overdrive, flanger and chorus pedals differently as well. I have a Boss GE-7 equalizer pedal as well, but it seems to be less useful with the new JJ tubes.
I must say, I have learned more about valves, circuitry and signal chain during this episode than I expected to. I even bought a multimeter to explore the voltage, ohms and amperes dimensions further.
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