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Regrettably, after 10 years, I need to decommission these amplifiers. They are quite heavy, weighing at least 130 lbs each, and as I turn 65 this year, I recognize the need to transition to lighter options. In hindsight, I should have constructed them using four separate chassis, as the design essentially combines two amplifiers into one; a 300b driving the GM70 into A2. I'm weighing the options of selling them as they are or disassembling them. I may consider building a simpler two-stage, lower voltage version, which could reduce the weight by 30-40 lbs. I initially built these amplifiers for convenience, allowing me to move them between my main system and my office system, where additional power is required. The numerous chokes included in this design contribute to its weight, and I might explore Kevin Kennedy's lighter version for use with my main horn system, as I do appreciate having extra power available when needed.
The Monolith Magnetics iron is probably worth more than I can sell these for so I'm considering just taking them apart.
Am I crazy?
Edits: 01/07/25 01/07/25 01/07/25Follow Ups:
IMO the odds of selling them locally is pretty slim and the nightmare of shipping would persuade me to dismantle and sell if I wasn't going to use them. Years ago you played these great amps for me the day you helped me repair my 15 lb. Music Reference RM10 MkII thanks again.
Good to hear from you!
I'm pretty sure these will be dismantled. I already have a game plan and ordering some parts. The OPT and IT transformers are $2200 plus freight alone so it doesnt make sense to sell it for even $3K.
Is the RM10 still in the system?
I have modified my Khorns again since then and using Tractrix horns with 2" drivers now.
I can empathize with this. I'm 72, and my A2 211 monos feel like refrigerators. Like yours, the iron (Magnequest) is probably worth a good bit of change. Still, I can't imagine ever tearing them apart. I'm sure they could be sold for more than the transformers are worth, and I would rather see someone else enjoy them. I also have enough projects and designs on my plate to last two lifetimes, so no need to salvage parts from what I've already built. Those are beautiful amplifiers. I hope you find a solution that isn't too painful.
If you love them, maybe you should just hire someone every time you want to move them. Beautiful amps, by the way!
That is a pretty subjective determination...
If you built these and are considering tearing them apart, the best solution is to just tear them apart and make the amps you really want on as many chassis as convenient. I have a set of 200 lbs amps that break apart nicely to move. (You also should consider upping your strength training as at 65 you are just hitting your prime.)
You can sell any leftover bits and use the money to upgrade that sweet vintage HP laser printer!
another 10yrs and my back will be toast.
50 yrs of surfing, water skiing, snowboarding, mountain biking and general work, I'll be replacing knees, hips and shoulders soon....
I still do most those things to this day and rode 35 miles last weekend on the MTB.
Just thinking aheadThat is also a Fax machine, lol....
Edits: 01/07/25 01/07/25
Similar. Mine are on casters, vertically built, can come apart to work on.
I'm in my late 70s and fortunately I decided 10 years ago that all my enclosures were 260x300mm maximum, and not over 12 kg.
You might be able to keep the existing chassis but just take a lot of weight out and put it in separate PSU chassis.
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