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Old 10th June 2021, 02:16 PM   #51
nigelwright7557 is online now nigelwright7557  United Kingdom
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Just built up a JLH1996 class A amplifier.
Didnt work so a careful visual inspection first showed a MPS92 in wrong way around.
So replaced it and it still didnt work.
Checked all components and found a bad trimmer.
Replaced it and amp burst into life.
Trimmer was ebay's best so maybe not unexpected that its faulty unless transistor wrong way around blew it.
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Old 10th June 2021, 06:19 PM   #52
xrk971 is offline xrk971  United States
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Hi Nigel,
I have only made a JLH headphone amp, and for a $20 kit - it sounded fantastic. Good to hear you got the bugs worked out!
Thanks for sharing.
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Old 10th June 2021, 06:19 PM   #53
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by poseidonsvoice View Post
So awesome! Great use of that Stratos chassis

And Vunce uses the same soldering iron system I do! It's a dream to work with! Great work Vunce, looking forward to your build.

Best,
Anand.

It’s always cool to see other people’s work benches!
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Old 11th June 2021, 03:24 AM   #54
Vunce is online now Vunce  United States
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Hey Anand!

So your familiar with Stratos, Hehe. The chassis is a monster, I knew it would come in handy some day. The positioning of the components is not set in stone, I just wanted to make sure everything would fit in side with the lid on.
I love my Hakko also! Switching tips takes 5 seconds and the selection of specialty tips, especially for SMD components, is fantastic.
Just received the parts to start the verification build, slinging solder this weekend

Cheers,
Vunce
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Old 11th June 2021, 03:42 AM   #55
poseidonsvoice is offline poseidonsvoice  United States
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On the bench...MOFO biasing

Click the image to open in full size.

Best,
Anand.
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Old 11th June 2021, 09:40 AM   #56
suresh is offline suresh  India
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Anand,
your work bench looks professional. Doctor or Engineer ? Congrats and
Hats off .
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Old 11th June 2021, 10:23 AM   #57
poseidonsvoice is offline poseidonsvoice  United States
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Quote:
Originally Posted by suresh View Post
Anand,
your work bench looks professional. Doctor or Engineer ? Congrats and
Hats off .
Thanks! I took the day off today to work on my MOFO , and yes...physician! How perceptive!

Best,
Anand.
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Old 11th June 2021, 12:31 PM   #58
xrk971 is offline xrk971  United States
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Hi Anand,

That’s a lovely bench ! Clean enough to operate on!

What is that choke you have?! Looks like a flat copper foil winding?

I see you have the same LED binocular magnifiers that Vunce and I both use.

I see you use JBL LSR 305’s to listen while soldering. Nice.

Prasi’s Mofo board looks great!

Thanks for sharing.
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Last edited by xrk971; 11th June 2021 at 12:33 PM.
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Old 11th June 2021, 12:38 PM   #59
Vunce is online now Vunce  United States
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X, That’s a Lundahl.
I use the same ones

Anand,
I will have to clear out my work bench clutter before anymore picture get out, LOL!! Beautiful work area you have
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Old 11th June 2021, 11:46 PM   #60
xrk971 is offline xrk971  United States
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WOBT - June 11, 2021: The LuFo PCBs are here! I’m going to start populating them. These boards are impressively huge. JPS64 did superb job. We have a few silkscreen errors but that’s the point of verification builds. We work out all the bugs before releasing proven-to-work designs for all to enjoy.
LuFo Amp - 39w SE Class A from 28v Rail-d4944c81-8afa-47d5-a0d3-67f624ed7a8a-jpeg

Did I mention that I ordered these monoblock chassis? Will be 3 weeks or so before they get here.

Click the image to open in full size.

Click the image to open in full size.
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