Randall Ninja V2H Michael Amott Signature Head

Рет қаралды 2,208

2 ай бұрын

Join this channel to show your support & get access to perks:
/ @bradsguitargarage
Webpage: www.bradsguitargarage.com.au
Facebook: bradsguitargarage
Instagram: / bradsguitargarage
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.

Пікірлер: 59

@Andy_Yates 2 ай бұрын

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

@thatampguy 2 ай бұрын

You’re damn right.

@dylanjastle 2 ай бұрын

I am invested in that fender from last video

@crazy.scorpio Ай бұрын

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 😁😁🔥🔥

@stringlocker 26 күн бұрын

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

@tedmich 2 ай бұрын

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!

@johnbriggs3916 Ай бұрын

Strictly speaking, the preferred name is propan-2-ol...

@kookoogearkook 2 ай бұрын

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

@TheStephensjoshua 2 ай бұрын

Sounds great. I love randall amps.

@alexdeleon7135 2 ай бұрын

I have that Maxon phase. I love it.

@victorbeebe8372 2 ай бұрын

Mahalo Brad! Interesting amp.

@goodun2974 2 ай бұрын

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 amps.....

@BradsGuitarGarage 2 ай бұрын

I was dreading that, but they actually went straight back in. I'm as surprised as you. Got a win for once!

@goodun2974 2 ай бұрын

@@BradsGuitarGarage , Every now and then we do get lucky..... But regardless, I would happily strangle designers who come up with piss-poor mechanical assemblies like this.

@Curranproducer 2 ай бұрын

CARCASS!!!!!!!!!!!!!!!

@baabaabaa-yp2jh 2 ай бұрын

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).👍🏼

@williamwebb8908 2 ай бұрын

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.

@BradsGuitarGarage 2 ай бұрын

There is a repair cost/market price balance there, but if you're happy with the amp and the parts are generic / still available and the price is right, I think it's worthwhile. If there are tech who just refuse all S/S gear across the board, I'd suspect that perhaps they don't understand it.

@hu666ghz 2 ай бұрын

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? 😂

@T00DEEPBLUE 2 ай бұрын

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

@doggwoggle 2 ай бұрын

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 🙃

@markspurgin8225 2 ай бұрын

Alaska shipping is awful 😖 I feel your pain 🤪

@will5150 2 ай бұрын

Hey, you're not allowed to rent here anymore!

@Swodie_Jeetin 2 ай бұрын

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

@BradsGuitarGarage 2 ай бұрын

Yes, it's quite common. Blackstar and many others use a similar arrangement.

@drgearaustralia 2 ай бұрын

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.

@BradsGuitarGarage 2 ай бұрын

Something tells me you didn't watch the whole video. LOL!

@drgearaustralia 2 ай бұрын

@@BradsGuitarGarage I was just super excited to give you more engagement!

@drgearaustralia 2 ай бұрын

Also, hit the front end of that thing with a Maxon OD9 to make it tight as hell chuggz!!!

@gamjammallota78 2 ай бұрын

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

@BradsGuitarGarage 2 ай бұрын

You no like exaggerations?

@goodun2974 2 ай бұрын

A few classic hifi speakers such as the Quad electrostatic actually incorporate what is known as a "crowbar" protection circuit: if you exceed a certain input voltage a relay activates and short circuits the input of the speaker so that you won't blow the speakers, but unfortunately you might blow up your amplifier, especially if it's solid-state.

@goodun2974 2 ай бұрын

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).

@BradsGuitarGarage 2 ай бұрын

They're small radial fuses. I think they are on sockets, yes. Marshall and others use them often, just soldered in place.

@goodun2974 2 ай бұрын

@@BradsGuitarGarage , yup, Wilkomman fuses or something similar. I've never seen them socketed, only soldered in place. BTW, there are also miniature fuses that look like a two-legged plastic transistor, sometimes seen in 70's/80's Japanese hifi gear.

@BenState 2 ай бұрын

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.

@BradsGuitarGarage 2 ай бұрын

They are riveted stakes for the source resistor standoffs. Similar to that seen in some Peavey amps.

@BenState 2 ай бұрын

@@BradsGuitarGarage ah that makes sense

@K707OR30 2 ай бұрын

Kept waiting to hear some Heartwork during the demo. Honestly, like you said it’s not that bad at all construction-wise considering how many features it has going on and the ridiculous output. There’s definitely worse stuff out there that people would believe is infinitely better built than this amp.

@BradsGuitarGarage 2 ай бұрын

Absolutely! It makes repair a bit of a pain, but it's pretty well thought out, overall.

@jamescassidy4045 2 ай бұрын

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?

@BradsGuitarGarage 2 ай бұрын

Yes, that's some residue of flux left behind. Give it a few more rinses with clean alcohol and a cleaned brush. It gets less hazy each time. Then after 3 or so rinses, scrub off the remainder with a dry brush and it should look pristine.

@Lu_Woods 2 ай бұрын

@@BradsGuitarGarage Sounds like grout haze after tiling ; )

@BradsGuitarGarage 2 ай бұрын

Yeah, similar to that! You never get rid of the residue 100% until you buff it, essentially.

@goodun2974 2 ай бұрын

@@BradsGuitarGarage, The hazy flux residue is much more noticeable if the board was manufactured with lead-free solder and you're cleaning it with alcohol. It's my understanding that leadfree fluxes were designed to be cleaned off with water, so perhaps distilled water would be the way to go, followed by alcohol at the end.

@BradsGuitarGarage 2 ай бұрын

Interisting. I'll give that a try next time. Thanks mate.

@kyledriscollmusic 2 ай бұрын

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

@BradsGuitarGarage 2 ай бұрын

Yes, they (not Bruce, the company who licensed his schematic and name) started cutting corners and cheaping out on the transformers. Replacements are available from Mercury Magnetics, however I suggest getting one sourced and installed by a tech whom is an authorised reseller, as they get great discounts and you'll likely get supply and installation for about the same price as the consumer retail cost of the transformer only.

@kyledriscollmusic 2 ай бұрын

@@BradsGuitarGarage thanks mate

@zulufrog 2 ай бұрын

2 ohm? Any Peavey from the1980's can run that all day, and smirk at you.💪

@BradsGuitarGarage 2 ай бұрын

How much actually makes it to the driver, though? You're talking 14-15 amps. You have 0.5 Ohms of combined cable and connector losses, you do the math.

@zulufrog 2 ай бұрын

@@BradsGuitarGarage Good God man! I don't do math! I was told there would be no math!😂

@zulufrog 2 ай бұрын

That amp is complicated to the point of silliness.