Jansen 4/12

Snarblinge · Post by **Snarblinge** » Fri Mar 23, 2012 12:55 pm

anyone have any further info on one of these, looking to build something small, like the idea of some NZ herritage in the build.

schems pics, anything really.

or I'll go back to planning a heavily heavily modified 18watt.

Post by **Slowy** » Fri Mar 23, 2012 2:33 pm

I have one. No schematics etc but the amp's in perfect condition.

How can I be of service?

Aquila Rossa · Post by **Aquila Rossa** » Fri Mar 23, 2012 3:56 pm

NZSimon is the man to talk to on this. he was one of the main men there at Jansen in those days I think.

Kev77 · Post by **Kev77** » Fri Mar 23, 2012 5:00 pm

I have a kiwi made solid state "wellard" amp - 18wt.,. like a mini blackfave looking thing.
just tone and volume

MogwaiBoy · Post by **MogwaiBoy** » Fri Mar 23, 2012 5:27 pm

Does that amp get you well 'ard, Kev?

Really nice tidy design and simple setup. How's she sound?

PS. If no online schem exists for a Jansen 4/12 and the other low wattage Jansens... someone should do one. Those circuits are NZ history that must be preserved for future generations of toannnnnnnnnsters

Snarblinge · Post by **Snarblinge** » Fri Mar 23, 2012 7:23 pm

I'm in research phase and agree it's a bit of history, just wanted to know more about it, there was a post on here a while back I was reading, that said it was 4 tube 12watt, which is the kinda thing i'm looking at how is it set up? PCB / tag? inputs, Tone/gain control, basic stuff really. pics would be nice. may build a replica. will hassle the Jansen vaults once i'm on the right track, as always NZG 1st port of call.

thanks

Snarblinge · Post by **Snarblinge** » Fri Mar 23, 2012 7:30 pm

Very tidy kev but i'm looking to build toobs.

Post by **Slowy** » Fri Mar 23, 2012 9:24 pm

Snarblinge wrote:I'm in research phase and agree it's a bit of history, just wanted to know more about it, there was a post on here a while back I was reading, that said it was 4 tube 12watt, which is the kinda thing i'm looking at how is it set up? PCB / tag? inputs, Tone/gain control, basic stuff really. pics would be nice. may build a replica. will hassle the Jansen vaults once i'm on the right track, as always NZG 1st port of call.

thanks

Will post photos when I can. New computer and camera aren't on speaking terms yet. (#%@*&!!!)

Construction is Point to Point with one line of big tags. Very little wire, just one component soldered to the next. Two 12AX7's, two EL84's. Output tested 2 years ago with 1970s Mullard 84s by Clarry. 12 watts clean, 18 watts full noise.

Volume, Bass, Treble. 2 inputs named Instrument and Bass Guitar/ Microphone The Bass input is noticeably hotter and gets fairly gnarly.

Snarblinge · Post by **Snarblinge** » Sat Mar 24, 2012 1:57 pm

sounds exactly like the sort of thing I want to build!!
was looking at something with single tone Volume gain, and aiming for that 12clean level. keen for pics no rush, i understand about the computer thing, mine was stolen, and I have borrowed a PC (don't get me started) scanner won't work, printer is oK and camera is a hassle, all old files in one huge mac backup file I can't access and insurance slow as.. grrrrrr.

thanks

Post by **Slowy** » Sat Mar 24, 2012 2:36 pm

Snarblinge wrote:sounds exactly like the sort of thing I want to build!!
was looking at something with single tone Volume gain, and aiming for that 12clean level. keen for pics no rush, i understand about the computer thing, mine was stolen, and I have borrowed a PC (don't get me started) scanner won't work, printer is oK and camera is a hassle, all old files in one huge mac backup file I can't access and insurance slow as.. grrrrrr.

thanks

Soon as I can, I'll strip her and get you some nudie shots.

Rog · Post by **Rog** » Sat Mar 24, 2012 4:54 pm

Not the 4/12, but might be useful to some of you?

Rog · Post by **Rog** » Sat Mar 24, 2012 4:56 pm

Here's a useful link I suggest you bookmark:

http://www.ozvalveamps.org/jansen.htm

Snarblinge · Post by **Snarblinge** » Sat Mar 24, 2012 9:01 pm

Cheers Slo, and thanks Rog, already in the link list

Post by **Slowy** » Fri Mar 30, 2012 12:24 pm

Thought I'd forgotten huh?

Post by **GrantB** » Fri Mar 30, 2012 1:27 pm

Wow - v cool.

NZGuitars.com : Filling you with GAS since 2003

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