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Bumping this thread after checking out Firmware 1.4 Unfortunately, global MIDI footswitch emulation is STILL missing. It's incredibly frustrating to see a major firmware update packed with new amps and playback/Showcase tools, while the most fundamental live-automation MIDI functionality from the OG Helix remains omitted. As I mentioned earlier, my entire touring setup (50+ automated tracks in DAW) relies on MIDI triggering physical footswitches. Having to map every individual block per preset instead of triggering the switch itself is a dealbreaker. Because of this single omitted feature, my Stadium XL is still sitting in its box in October 2026, and I'm forced to stick with my original Helix on tour. Line 6, please... prioritize restoring physical MIDI footswitch emulation for v1.5!

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Dear group, I can not emphasize this enough,...do not, do not, do not use anything other than the specified tubes (valves) in these amps. Power tubes must be matched sets. Use only the specified tubes. Please, I'm trying to keep your gear of of my repair bench, so you can make music and rock out. Thank you.

Flyers_V88,... with an all analog amp, I would agree. But using other brands, incorrect biasing and not know the hard/medium/soft of the tubes,.... it has resulted in a number of these amps ending on my bench. These are not all analog tube amps, the digital section and analog section have to talk nice to one another, or things go wrong and they end up on my bench. Normally I would agree with you, but in the case of these amps, the correct tube IS the issue in this case. So to everyone,... use the specified tube and bias, and have a Line 6 authorized service center do it. Seen too many blown amps for this reason. So please don't do that. I'm trying to keep everyone's gear off of my repair bench.

All four have to be matched, so all four have to be replaced at the same time with a matched set,... in this case, the whole Quad.

Hi I have one tube gone bad in my spidervalve hd100, can I change the bad valve alone, or do I need to change a pair or quad. In most valve amps the valves are working in pairs so i'd expect to replace a pair of tubes not a whole quad.

Mark,... It has to do with the subtle differences in the characteristic curves of the afore mentioned non-specified tubes. The program board does not like those differences, and the analog portion doesn't like the digital sections response. So it is imperative that the specified tubes are used.

Frankie,....No. Don't do that. Tubes are not arranged for that sort of thing. Frankie, Mark,... these are not the all analog tube amps of the 1960's and 70's, these are hybrids. Can not get away with doing these sorts of things like we used to do back in the day. The analog and digital sections need to talk nice to one another. As a result, these amps don't take kindly to modifications. Don't mod these amps.

For Alchemist users, it's not a simple tube replace and bias. There is a whole bias and burn-in procedure, and calibration to be done, so leave the whole procedure of this one to the professionals (Line 6 authorized servicing).

Tube choices to use,... Spider Valve: 12AX7B China for pre-amps. 5881WXT Sovtek (matched pair), with the base cup bottom. 5881WXT Sovtek (matched quartet), with the base cup bottom for the HD-100 and HD100 MkII. Soft, medium or hard, the ratio between vacuum-to-inert gas in the tube,... all tubes used have to be mediums. Low microphonic 12AX7EH for the pre-amp is fine. Power amp tube choices are crucial, and must be properly biased by a tech or Line 6 authorized service center who knows the product. Don't do this yourself, the shock hazard is too great,... and it hurts when you get electric shock. Leave it to a tech trained who is for this. These valve amps are particular about tubes and tube brands. Do Not use substitutes, No Mesa, Groove Tube, Tung-Sol, Ruby or JJ substitutes. No hot rodding of an already Bogner hot rod.