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Since you mention it gets better after awhile, I would suspect bad cap, but hard to say for certain. It might be that something is getting warm enough thermally during that hour for a joint to fully close. Again, just guessing. Does the problem exist on all channels? With EQ in or out? If on...

I've only had my Mk IV for a few weeks (bought used). While there are minor differences between channel volumes with the channel masters set at the same level (e.g. 3-4), they aren't dramatic. Are the gains set relatively similar for all channels? What about treble setting (fairly dramatic...

Short head + Thiele cabinet. Your ears and your back will thank you. My thiele has the C90 so I can't comment on the EV speaker. The only experience I ever had with EVs in a guitar amp is with a silverface Twin. That amp, with a Strat, could best be described as an unpleasant blizzard of...

So here's a question (from someone who can write, plays guitar, and understands amplifier electronics): How many Mesa amps have been produced? The answer to that question is a significant factor in the commercial viability of a book. Dave

No problem...I figured that you might have switched the names around since the impedance calcs were right. The flu this year - well, don't wish that on anybody, took me weeks to get rid of it. Dave

Well, the post stripped the leading spaces...if you imagine the vertical lines on my drawings being much further to the right, you'll get the idea. In general: For parallel, one side of the speaker cable is connected to the same terminal on BOTH speakers. The other side of the speaker cable is...

This description isn't sounding quite right; in fact reversed for series and parallel connections (however the math is right for calculating the impedance). I'll try to draw out the correct version below; we'll see how it represents when I post it: Parallel is as follows: Speaker plug contact...

+1 on the camera. The bottom has the same inward warp, and it's slightly on the sides too. Pincushion or barrel distortion is common on cheap lenses. Dave

If there was a crack in the base of a power tube (probably due to heating and cooling cycles), that opens a potential base for a short circuit between two pins. Hence, a voltage from one gets applied to a second. There are circuit components - bias resistors, filtering and tone shaping...

Only had mine for a couple months and used in some jams (no gigs) but absolutely no problems. Dave

Agreed 100%. Also, audio perception has complex issues; e.g. in A/B of stereo speakers, people often prefer the "louder" (i.e. more efficient) set, despite other characteristics. Fatigue has a great deal to do with perception as well. Approaching changes in a systematic way can help, at least...

Others who have used/owned a Mk IV will be able to comment more authoritatively; I haven't played a Mk since 1978. However, I have been interested in one, only because of the lure of potentially going from clean to crunch to scream in a single amp (without external pedals). In looking at a...

Chiming in to try the LSS again, and agree with the other poster who said to try head cab, or try and extension cab to move more air. I'm playing PRS Cu24 and a Strat through a LSS myself, and the sound is outstanding. Alternatively, if you need the volume only for live situations in larger...