Randall Ninja V2H Michael Amott Signature Head

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Equipment:

Soldering:
Pace MBT station w/SX100 & PS-90 handpieces
Hakko 474 w/815 handpiece
Hakko 936 w/907 handpiece
Hakko FX-888D w/FX-8801 handpiece
Quick 861DW hot air station
BOFA fume extraction unit
Loctite Multicore solder (C511 / 362)

Test Equipment:
Fluke 11, 175, 177 & 179 handheld DMM's
Tektronix 2236 analog oscilloscope
Rigol DS-1054z digital oscilloscope
BK Precision 4017A sweep / function generator
BWD 160a function generator
HP 6236B triple output DC power supply
Kyoritsu 3132A insulation / continuity tester

Video equipment:
Overhead cam: Panasonic HC-V785 w/Audio Technica AT9946CM mic
Handheld cam: Panasonic DC-G85 w/Olympus M.Zuiko Pro 12-40mm f/2.8
On location cam: Panasonic DC-GH5s w/Panasonic-Leica 9mm f/1.7 & 12-60mm f/2.8
Capture card(s): Magewell HDMI USB, ATEN UC3020-AT, ATEN UC3021
Headset Mic: Audio Technica BP892xcW-TH
Lapel Mic: Rode Go
Editing: Adobe Premiere Elements

Hand Tools:
Wiha, Felo, Stanley screwdrivers
CK & Engineer cutters / pliers
RS Pro wire strippers
Sidchrome & Gear Wrench spanners, sockets & shifters
Veritas planes & chisels

Materials / Consumables:
JJ's / TAD electron valves
Elixir / Ernie Ball / D'Addario / Rotosound strings
Electrolube & DeoxIT cleaners, lubricants & chemicals.

[stringlocker]

No matter how complex or simple A Randall is there's usually only one setting, You find it and leave it there forever.

[dylanjastle]

I am invested in that fender from last video

[Andy_Yates]

Heartwork was the album that got me exploring more extreme music back in the 90s. This Mortal Coil is one of my warmup songs now too. Still love it after all these years

[crazy.scorpio]

As a huge fan and friend of DUNN, I'll say Holy Crap...That thing is a beast 🤘 He will put it to good use 😁😁🔥🔥

[goodun]

Desoldering all the output mosfets may have been the easiest way to get that board out, but it wont be easy to line up several dozen transistor leads with the holes/pads in the PCB for reassembly! Each row of mosfets should have had an aluminum strap bolted to them *before installing the board into the chassis* and then you could use machine screws from underneath the chassis gointo into threaded holes in the aluminum strap to pull the strap and attached mosfets down against the chassis, with some heatsink grease between them. A common assembly technique for hifi power

[kookoogearkook]

Great repair and playing too! Randall has some cool amps.

[tedmich]

Isopropanol is perfectly suitable naming; any alcohol can be named this way based on its carbon count: methanol, ethanol, propanol... Great job as usual Brad!

[drgearaustralia]

Randall make some solid amps. I always wanted the original V2 version of this head, they sound brutal.

Didn't Bruce Egnater design these ones? I know he did the Warhead 2 for Dime.

[goodun]

What are the little red-brown cylinders mounted to the board behind the big blue filter caps? Capacitors, or Wilkoman fuses? I've seen red-brown capacitors like that in a lot of older European hifi gear, and the bakelite shell develops microcracks and lets moisure in. If they're fuses, that's a bad way to utilize them because theyre typically soldered in place and so it would require massive disassembly to change them (although I see what looks like a white base underneath them and I suppose it could be a plug in socket if those are indeed fuses).

[baabaabaa-El]

420w cure for constipation!!
The cleans weren't as sterile as l was expecting...
Good job mate... the silicon was orgasmic (there ya's go, splooge joke no1).👍🏼

[Swodie_Jeetin]

ATMega microprocessor... basically an Arduino controlled amp that's pretty neat

[TDEEPBLUE]

The connectors you forgot the name of are called JST.😉

[doggwoggle]

Huh, I get free shipping from Mouser to Sweden, for orders over ~57 AUD, ships with fedex and takes 2-3 days. Weird that wouldn't apply to Australia, Sweden is hardly next to Texas 🙃

[hughz]

Can't wait to get this home and riff it, but howcome it never sounds as good as those clips you did when I play it? 😂

[williamwebb]

I'd been lead to believe that most techs won't work on SS amps and would generally suggest you tossed them out and get a new one. This gives me hope.

[markspurgin]

Alaska shipping is awful 😖 I feel your pain 🤪

[jamescassidy]

Ive been using some really good 99.9% isopropyl on some boards recently, and I've noticed it sort of discolours the board, or maybe not so much discolours it, but it leaves almost like abit of a haze, have you ever noticed that with the strong alcohols at all?

[kyledriscollmusic]

you mentioned Egnater, my Tweaker 88 blew a few times before I gave up on it. I've heard it's usually a transformer issue, do you have any experience with them? Such a shame that an amp that nice should be so unreliable

[BenState]

Gosh i couldve sworn those look like dry-joints @11:04 with the rings around the pads? Must be optical illusion on the vid. Nice work man, not for the faint-hearted.

[SirLoinMagroin]

I was into it real [too] serious until the " 2-ohm Crowbar " remark. Thanks for snapping me out of it.