Page 2 of 2

Re: Jansen Liberator - New (old) Amp Day

Posted: Tue Dec 09, 2014 7:00 pm
by pins
Cool ,great to see what I call "Iconic NZ gear" still cranking out the thump !
You've done well at getting the 'Herniator' back into action and competing with the band,full credit to you. 8)

I have an old 70's ? Jansen ( Fender copy) bass here that will get a refurbish when I get round to it.

Re: Jansen Liberator - New (old) Amp Day

Posted: Fri Dec 12, 2014 9:29 pm
by monster
pins wrote:Cool ,great to see what I call "Iconic NZ gear" still cranking out the thump !
You've done well at getting the 'Herniator' back into action and competing with the band,full credit to you. 8)
Thanks :)
I think the Jansen and Holden gear is classic NZ kit, probably overlooked until fairly recently. Looked after nicely I've found they work well. My Bassman 75 that I bought in 1991 when I was 15 works well still.
I took the Herniator into Tony Baxter (New Plymouth tech) yesterday and it is only making 40-50 watts output before distorting, so something needs attention. On the plus side, if it keeps up OK with 50watts then getting it back to 180watts will increase clean headroom quite a bit!

'Best' option is phase inverter valve or circuit components.
Less desirable is a faulty output valve or two.
...and worst case is the output transformer has a problem :cry: Fingers crossed it is not this...

Whatever it turns out to be I'll get it fixed. I like vintage stuff, I like stuff that can be fixed and I like restoring stuff. And it is a tax-deductible expense.
I have an old 70's ? Jansen ( Fender copy) bass here that will get a refurbish when I get round to it.
Have you got a photo of it?

Re: Jansen Liberator - New (old) Amp Day

Posted: Sat Dec 13, 2014 11:57 am
by pins
My very first Amp and Cab were both Jansen, wish I had taken more interest in it and maybe a photo at least. But it had issues with the transformer thingy and was poos. Cant even remember what i did with it ?

Heres the Jansen Bass, gotta love the brush painted purple. Still plays ok and sounds kinda unique for want of a better term. There are more pics in there somewhere .

Image


Hope your amp is easily repaired.

Re: Jansen Liberator - New (old) Amp Day

Posted: Sun Dec 28, 2014 9:49 pm
by monster
pins wrote:My very first Amp and Cab were both Jansen, wish I had taken more interest in it and maybe a photo at least. But it had issues with the transformer thingy and was poos.
Transformer problems can be expensive to fix if they need a rewind.
I recently got a matching jansen 2x12 for my bassman 75. I'm quite keen to fit a pair of modern drivers of good efficiency to hear how the rig sounds. Original Philips drivers are a bit rubbish I think.
Heres the Jansen Bass, gotta love the brush painted purple. Still plays ok and sounds kinda unique for want of a better term. There are more pics in there somewhere .
Thanks for the pic. Looks pretty cool I reckon, but I am highly biased ;-)
Hope your amp is easily repaired.
Components in phase inverter circuit needed replacement. $120 all up.

Re: Jansen Liberator - New (old) Amp Day

Posted: Wed Apr 26, 2017 10:34 am
by monster
Since my last post many moons ago the Liberator has been treated to new tolex, re-chromed corners, new black handles, a better vent for the top and a repositioned back cover to allow more cool air in at the bottom. I've also replaced the rubber feet with large squares of self-adhesive Nolothane to help absorb any vibration from the cabs.
20160907_204449.jpg
20160907_213231.jpg
20160907_213355.jpg
I have yet to find a replacement tremolo board, but no desperate hurry for that.

My tech had it on the bench a couple of weeks ago and clean output was measured at 153 watts at 8 ohms, so a few watts down on it's apparent potential of 180. It still has the set of KT-88s I had installed in 2014.

Re: Jansen Liberator - New (old) Amp Day

Posted: Tue May 02, 2017 9:23 am
by Pablo Basso
Most amps, including Jansen rate amps into 4 ohms, so 153 watts into 8 ohms is healthy. My Crusader 220 Magnum, for example, is rated at 82 watts at 16 ohms, 145 watts into 8 ohms, and 220 watts with 4 ohms (read off the back panel).

Re: Jansen Liberator - New (old) Amp Day

Posted: Thu May 04, 2017 7:35 pm
by monster
Pablo Basso wrote:
Tue May 02, 2017 9:23 am
Most amps, including Jansen rate amps into 4 ohms, so 153 watts into 8 ohms is healthy. My Crusader 220 Magnum, for example, is rated at 82 watts at 16 ohms, 145 watts into 8 ohms, and 220 watts with 4 ohms (read off the back panel).
The transformer on my Liberator is switchable only for 8 and 16 ohms. I'd imagine that the output of a valve amp is largely the same at any ohm setting because of the transformer.

I usually run it at 16 ohms - two 8ohm TL606 cabs using a 'series box'.