[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #20 on: August 24, 2011, 08:06:45 AM »
finished and working!

Alex, how does it sound?


ultra-alex

Re: JENSAMP-51X - the build and support threat
« Reply #21 on: August 25, 2011, 05:28:01 AM »
so far i made a little hi-z input shootout between some of my preamps with a fretless bass as source. compared with a millennia td-1, tube tech pm1a, rnd 517, sh monogama, ss mp73, ss mp12, ss mp32 and amek console pre with a radial jdi. i liked the tube tech most, followed by the jensamp and the shadow hills. although i have to say that the differences/impression were subtle/subjective and all the used amps performed very good as expected.
i like the jensamp a lot and will build a second unit. :)
cheers, alex
« Last Edit: August 25, 2011, 06:46:41 AM by ultra-alex »

Matthew Jacobs

Re: JENSAMP-51X - the build and support threat
« Reply #22 on: August 27, 2011, 06:16:35 PM »
For those of use building this baby in a rack... Would a 9K PSU stuffed with +24/-24 components and the correct power TX do?

Another option would be two +24V PSU using 1 toroid, right? As it's good to keep the relays off the audio power, right? plus +48V for the phantom.

Looks like the 9K is the easiest solution for me as I have loads of them kicking around.

[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #23 on: August 27, 2011, 07:09:22 PM »
the 9K PSU should work fine

nashkato

Re: JENSAMP-51X - the build and support threat
« Reply #24 on: August 30, 2011, 06:03:00 AM »
i think there´s a mistake on the BOM .
R19, R24 reads 5k81 , should be 6k81 as on the PCB , i guess ?


[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #25 on: August 30, 2011, 11:54:22 AM »
i think there´s a mistake on the BOM .
R19, R24 reads 5k81 , should be 6k81 as on the PCB , i guess ?
yes - thanks for the hint - corrected the parts list  :)

zmgwg

Re: JENSAMP-51X - the build and support threat
« Reply #26 on: August 31, 2011, 06:46:02 AM »
silent:arts, how about using EA neve transformer as input, what do you think?

[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #27 on: August 31, 2011, 06:54:59 AM »
why not?
lower gain, interesting to see how you fit it at the PCB.
try it and give us feedback!

okgb

Re: JENSAMP-51X - the build and support threat
« Reply #28 on: August 31, 2011, 07:50:31 PM »
I'm presuming , please correct me if i'm wrong , that the germainium xistors don't pop easily
and that sockets are not necessary ?
GKB Audio / Greg Boboski

[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #29 on: September 01, 2011, 03:16:40 AM »
with rev01 Darius killed a few while trouble shooting >:( :( :o ;)

however, the rev02 and rev03 I have here still have their first and only ASY26 working since their birth.
(and they have been abused a few times)
no need for sockets


Tajmoben

Re: JENSAMP-51X - the build and support threat
« Reply #30 on: September 09, 2011, 08:57:06 AM »
I finished mine up and they sound great!!! I do have one question though. When I switch from XLR to Hi-Z there's a small pop, is this normal?

wowi

Re: JENSAMP-51X - the build and support threat
« Reply #31 on: September 09, 2011, 10:18:43 AM »
I finished mine up and they sound great!!! I do have one question though. When I switch from XLR to Hi-Z there's a small pop, is this normal?

I just checked mine and yes, i also have a clear pop when switching. It's no big problem though, but maybe Kubi and Volker have an idea, how to avoid this.  :)

Wolfgang

[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #32 on: September 09, 2011, 03:20:39 PM »
I finished mine up and they sound great!!! I do have one question though. When I switch from XLR to Hi-Z there's a small pop, is this normal?

I just checked mine and yes, i also have a clear pop when switching. It's no big problem though, but maybe Kubi and Volker have an idea, how to avoid this.  :)

well, I don't know how to avoid this. like with relays I'm not aware of shorting versions, they are all break before make (while relays are switching so fast you nearly never notice this).

Looking at the schematic, next possible cause could be a DC voltage difference between both inputs.
We could try some (high, something like 4M7) resistance between pin 1 and 3 of the switch?
But HiZ and MicIn wouldn't be 100% isolated anymore :(

mhm, no time to try it this weekend, may be Sir Kubi has a better idea.

okgb

Re: JENSAMP-51X - the build and support threat
« Reply #33 on: September 13, 2011, 01:50:38 PM »
In case anyone is interested , the Marshall style " cliff ' [ the brand  ] jacks seem to
just fit , i didn't have a pc mount to check , so a couple of wires should do it .
had to trim the rounded part slightly  but the nut fit into the panel hole
looks same also as the jack t.c. electronics use [ brand ? ]



yeah , that's my '73 marshall 1987 head that someone else put a master volume in before i got it back
[ but I did ! , get it back ]
« Last Edit: September 14, 2011, 09:05:50 AM by okgb »
GKB Audio / Greg Boboski

[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #34 on: September 13, 2011, 05:13:14 PM »
looks cool!

[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #35 on: September 18, 2011, 04:44:07 AM »
ok, I want to show you my D-ASY26 ;D ;D ;D





these are rev02 PCBs, converted to +24 / +48V. I did one further trace cut and wire to change the POL and LOAD switch position.



the PSU and PSU transformer is way overkill, I just used what I have had handy.
thanks Frank from NRGrecording for the perfectly engraved front panel!
« Last Edit: September 18, 2011, 04:58:03 AM by [silent:arts] »

baadc0de

Re: JENSAMP-51X - the build and support threat
« Reply #36 on: September 18, 2011, 06:45:51 AM »
It's a beauty, you should be very proud. How does she sound?

3nity

Re: JENSAMP-51X - the build and support threat
« Reply #37 on: September 18, 2011, 09:53:07 AM »
Volker looks great clean build.
Are the relays under the board???
I dont see them!

Thanks...
Life is a path, death the destination.

[silent:arts]

Re: JENSAMP-51X - the build and support threat
« Reply #38 on: September 18, 2011, 10:18:46 AM »
It's a beauty, you should be very proud. How does she sound?
exactly like the 51X version ;D

Are the relays under the board???
I dont see them!
yes. this is part of the positive (voltage) only mod :)

3nity

Re: JENSAMP-51X - the build and support threat
« Reply #39 on: September 18, 2011, 10:21:08 AM »
oh! :D
Life is a path, death the destination.


 

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