LYNX amp problems...Help

[li_gangyi]

Ok guys...just got the PCB today...gonna start the amp soon...about 2 days time...gotta get the parts you know...where do you guys get parts ehh??? RS and order 10 of the same value?? Seems a bit extreme for me...although I can get 1 piece locally...it is usually unmarked when packed and I have a big headache when I reach back home and then sort out the values...got an easier way?? buy a bit more and write on the "reel"?? Or tape it somewhere and mark it...??

 

[Jan Dupont]

Li

Just a tip......
Always meassure the values of resistors before attaching them to the PCB!!!
Even though that I have no problems with the colour codes on resistors, I always measure them before attaching them.....
I takes a bit longer, but can save you both money and lots of time in the end

 

[Andypairo]

Jan check your email

Hello Jan,
i sent my package today.
I tried to e-mail you but it bounced back.

Cheers

Andrea

 

[li_gangyi]

Yeah...maybe I should invest some cash on a DMM...only got an analog one now...and quite old...

 

[Jan Dupont]

Li

That would be a good investment

 

[li_gangyi]

Yeah...and get a scope as well right?? where vcan I get cheapie scopes in Singapore?? any one knows??

 

[UrSv]

Just finished 4 PCBs for this amp. Very neat size...

 

[li_gangyi]

hey cool..a clone of the original~!!!

 

[Jan Dupont]

UrSv

It's looking very good
Nice job

 

[li_gangyi]

Though it does not have that fantastic silkscreen that ACD provides...and yeah...still gathering parts for my amp...now it's just the PSU...those freaky caps...grrr

 

[UrSv]

Well, I cooked it in the kitchen so it would not look as good as the "original". However, it is blue...

 

[Jan Dupont]

I can spray paint mine

 

[JojoD818]

Nice pcb work!

Hi guys,

Can't wait to get my hands on working on the LYNX! Anyway, just got finished adjusting my leach amp. You can see it here: http://www.geocities.com/jojod818/leach_amp/leach_low_tim.htm

I'll try and gather enough parts to start another round with the LYNX, this time with ACD's layout. Anyone built it yet?

JojoD

 

[Jan Dupont]

Info

I have just updated my website

 

[li_gangyi]

Cool...now a kit...hehehe

 

[Andypairo]

Jan, the PCBs arrived but..

Hello Jan, I just received the PCBs.. they are really nice and incredibly tiny... one wouldn't expect them to be the PCBs for a power amp (before looking at the tracks, of course).


And yes, the silkscreen says "BCE" for the bias transistor... what if I use a TIP41C (which has the correct pinout) instead of the MJE340?

Cheers

Andrea

PS Your email seems to be again down...

 

[Jan Dupont]

Its up again.

Tip41C is rated 100Vce, so only for low rail supplies

 

[Andypairo]

As far as I can understand the bias transistor will have a VCE of about 6Vbe, that is slightly less than 100V

In Holton's symamp a BD139 is used for bias transistor, so it shouldn't be a great problem.

Cheers

Andrea

 

[Jan Dupont]

Sorry for my short and rushed reply before (I'm sitting at my work )

Andy: You are right!

This PCB version is used in a refined Near Field Monitor Amp, that I'm trying out at the moment

 

[Andypairo]

Well, thinking about it after all it's not a great disadvantage to mount the MJE with the plastic part on the L-profile... in fact there is no need for insulation .. will thermal tracking be affected?

Cheers

Andrea