1964 JMI Era VOX AC30 replica layout and chassis plans
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- Turret
- Posts: 180
- Joined: Fri May 04, 2012 11:32 am
- Location: Woodley/Reading, UK
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1964 JMI Era VOX AC30 replica layout and chassis plans
Hi again
Here's JMI era AC30/6 1-to-1 replica layout I've done some time ago
http://www.turretboard.org/?p=1108
And the chassis plans:
http://www.turretboard.org/?p=1168
Hope you like it
Here's JMI era AC30/6 1-to-1 replica layout I've done some time ago
http://www.turretboard.org/?p=1108
And the chassis plans:
http://www.turretboard.org/?p=1168
Hope you like it
- chief mushroom cloud
- Posts: 420
- Joined: Tue Jan 18, 2005 5:42 pm
- Location: Peenemunde CA
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
a man after my own heart...Vox AND HiWatt
site bookmarked
site bookmarked
Don't overthink it. Just drink it.
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Good stuff Torg thank you.
Mark
Mark
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
That's awesome Torg!
Loves me a good AC30.
Loves me a good AC30.
<i> "I've suffered for my music. Now it's your turn."</i>
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Cheers mate
BTW
I've seen JMI era correct chassis and copper faceplates on ebay yesterday (not sold by me), and another one without faceplates but cheaper
I wont link it as I didn't read the forum rules and I don't wan't to be kicked before I really started
BTW
I've seen JMI era correct chassis and copper faceplates on ebay yesterday (not sold by me), and another one without faceplates but cheaper
I wont link it as I didn't read the forum rules and I don't wan't to be kicked before I really started
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Man, I've got 5 of the old Paxolin tag boards. I could........
Oh hell, I need to just step away from the computer before I get into more trouble.
Oh hell, I need to just step away from the computer before I get into more trouble.
<i> "I've suffered for my music. Now it's your turn."</i>
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Nice. I see you've kept c-41 at .047uf
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Thanks, and yesMasco wrote:Nice. I see you've kept c-41 at .047uf
Two reasons:
- I did my layout from actual unit carried by my British friend - his AC30/6 had 47nF cap at this position
- other reason is I seen no other AC30/6 with 5nF for C41 myself (both in person nor on the web). I haven't looked hardly on the other hand. My knowledge concerning AC30 history is limited, but till now I was sure that 5nF/C41 is common with AC30/4 only
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Yes, it appears that way. Looks like it happened when they dropped one extra RC filter network(1Meg/4n7) before the Vibe/Trem volume pot. They had to make up for the extra 6dB/octave loss to trap out the LFO. Probably had something to do w/ needing more room on the lower tag since they eliminated the small oscillator feedback tag bd. and moved those components and the depth preset pot to a slightly larger bottom tag bd.torg wrote:till now I was sure that 5nF/C41 is common with AC30/4 onlyMasco wrote:Nice. I see you've kept c-41 at .047uf
I believe the larger c41 is worth mentioning in Stephen's book, since most 30/6 have them. He simply copied the layout from the 1960 schematic which didn't reflect the change.
One small thing: You're layout drawing has a 16ohm load connected to the 8 ohm tap. Blue=16 green=8
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Very cool, thanks for correction and further explanation
I'm very humble and always happy learn new things, could I quote you on my website regarding C41 issue?
I'll do the corrections i revision.6 later this week (as well as some other cosmetic corrections). I'm working on schematic to, after that finally I'll put it to bed, and I move on
Stephen Grosvenors AC30 Service Engineers Guide is alright, I'm hoping he'll extend the info in further book revisions
I'm very humble and always happy learn new things, could I quote you on my website regarding C41 issue?
I'll do the corrections i revision.6 later this week (as well as some other cosmetic corrections). I'm working on schematic to, after that finally I'll put it to bed, and I move on
Stephen Grosvenors AC30 Service Engineers Guide is alright, I'm hoping he'll extend the info in further book revisions
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
Well, the two changes seemed to happen at the same time, but I'm doubtful now that they're related. The 5nF was probably an old mistake on Vox's part (not Stephen's). The removal of extra 1Meg/.0047 RC before the volume pot was probably mainly for real estate. The .047 is clearly a better choice, the V/T channel is weak enough as is.
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
ERROR ALERT
it was brought to my attention that fallowing error is in my drawing:
Thanks to Amp Garage members Matt (JMJ Amps) and Charles
it was brought to my attention that fallowing error is in my drawing:
I'm working to fix it, I just have to sort out my server issuesLooks like you've omitted the plate supply wire that goes to R-39 on upper left tag. The wire should come from the bottom of R-60 on lower tag.
Thanks to Amp Garage members Matt (JMJ Amps) and Charles
Re: 1964 JMI Era VOX AC30 replica layout and chassis plans
I appreciate the layout but you guys are actually able to read the part values? When I zoom in on this image everything is digitized to the point of non-readable. What are you guys doing different than myself please?
I have Stephen Grosvenor's book and I assume you borrowed from this but used a hipper drawing tool?
I have Stephen Grosvenor's book and I assume you borrowed from this but used a hipper drawing tool?
Most people stall out when fixing a mistake that they've made. Why?