Bringing A 1965 JMI Vox AC30/6 Up To My Standards - Part 1
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- Опубліковано 23 лип 2023
- 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.
I forgot to talk about heater elevation when I talked about groud referencing. Sorry, I'll cover that in ep. 2.
That’s a very clean cab for a JMI.
Ok. Brilliant. Looks like you know your stuff! Just found your channel. Lyle / Psionic audio mentioned you in 1 of his recent videos. I think a Marshall DSL 40c. I ain't no amp tech or anything. I own heaps of guitars amps n pedals but don't play real good either. Just really interests me. By the way, I live near Newcastle NSW. I'll be watching a heap of your other videos too. Cheers
Is this from the "She ain't set-up" series? Love your work Brad and thanks for sharing it. The apple didn't fall far. Great specimen of the JMI series Vox. Psionic is smiling. Hammond recruited many early tubes for their organs, leslies, as well as others did back in the early days. the circuit has been modified/serviced before too. Go with the el84 reliability mods. Yes the el84 circuits are purposefully abused, in fenders and others as well. They used to be cheap. No more. A cooler bias will deal with voltage/amperage shifts better than a hot bias with no negative effects. Wall voltages often shift 20volts or so. There lies the Rub.
Looking forward to the upcoming series of repairs on this vox and the marshall. The new editing and camera work is really nice as well.
You Sir are a CHAMPION! A second classic amp done the Brad way, BRAVO!!
Nice! Beard matches the grill, you're definitely the man for the job! ;)
Beautiful shots. Thanks for your har work putting this together. Really enjoyable.
Another great amp, can't wait to see how this one turns out along with the Superbass
Great stuff! wish I owned it. can't wait to see what you do with it! I bet this would sound nice paired with the superbass!
Nice to see you working on an amp that deserves your skill and attention to detail. I'm thinking this one will be a lot more fun than some of your recent Saturday morning adventures :-)
That amp is lucky it found you. Far from a train wreck, but definitely a basket case. Good one my friend.
This bloke almost looks like he knows what he's doin! haha nice one mate.. great vid and the beards even better \o/
Excited to follow along! I've got my own 64 ac10 project coming up soon so I'm excited to pick up some tips and tricks along the way from you
Another interesting one 😉 !
Goodness gracious the beard
You are thinking of a "spring nut J clip" not a Fahnestock clip. They kind of have a single screw thread stamped into them before they get bent into a J or a U to clip onto the sheet metal and in rapid assembly some workers will just ram the screws in then give a final twist to tighten them up or strip them out.
After watching the walk-through, this AC30 is a lot like how the Cambridge Reverb I worked on was built... all solid core wire, wrapped around the eyelets like 3-4 time, 3-4 wires crammed in each eyelet. No grid stoppers, no heater balancing, components stacked on top of each other in a chassis about 1/5th the size of that AC30. No wonder it took me 6 months to get it working again! Hehe!
The Jennings AC30 I have in right now has rather large single section TCC filter caps. They are large enough I can stuff the two modern 16uFs and the 8uF into one can.
Hammond branded preamp tubes are most often Telefunkens or Amperex, look for the T. diamond on the bottom, if absent it's a Bugle Boy. Hammond EL84s are almost always Telefunkens (keep it a secret! 🫢)