Someone left it behind. I believe it was used as a shroud to hide his ManDate magazine.

"Now if somebody can spot my way of dealing with the 10M90 sinks with only metric screws at hand... "

That's what I did.

I later thought I could have drilled a hole and tapped it M3 a little higher up the heatsink, but thought the loss of mounting surface on the device would be overly compromised.

Nice looking build

I'm all about smaller these days so love that it fit it a 2U case.

When I test the 4686 transistors I get an unexpected reading using my DMM and only with the transistors in the middle (red arrows, and on both boards):

Collector to emitter: 0.75 V

On the rest of the 4686's: OL

Both base-collector and collector-emitter conduct one way only as expected.

Why do I get those readings only with the middle ones and not the rest? both boards?

At first I thought they were damaged but its to much of a coincidence with the same ones on both boards.

Those are the top output transistors, and you can't measure them in circuit that way

and get reliable results.

Thanks. I figured it was because they were in circuit, but wasn't sure why.

Measuring anything while in circuit is always a crapshoot. Way too many variables to list.

While we are on the subject, the HV sounds fucking amazing!! Who stuck a subwoofer to my 007 Mk1's?

Yeah Team.

Boards at the post office , will pick up tomorrow.

prototypes of the multiamp,blackhole and preamp.

Will be sending justin his knob tomorrow also, i

had better see pictures of it mounted.

Edited March 7, 201214 yr by kevin gilmore

Will be sending justin his knob tomorrow also, i

had better see pictures of it mounted.

Damn! At least make it a challenge for me Kevin!

Sorry, i'm tired and could not be much more creative.

Eggil, have you powered up yet?

No, waiting for the transformer.

Will be drilling holes in the heatsink on friday.

Edited March 8, 201214 yr by eggil

eggil - I’m just curious for my own understanding, wouldn’t soldering those transistors last be preferable?

I see what you mean, but what I am doing is not that hard. I have not screwed the aluminum plate to the transistors yet.

Good luck drilling, I look forward to seeing your amp eggil.

Edited March 8, 201214 yr by johnwmclean

Why two layers of angle brackets?

Actually it will be only 1.

I had 2 in the picture to help me figure out where to drill the holes.

Well, drilling the heatsinks was harder than I thought!

Hope didn't screw up anything.

Edited March 10, 201214 yr by eggil

Nice work eggil.

It looks like the same guy who started this train-wreck of a thead over there is actually going forward with his build.

thats the same guy!? hope he at least figures out how to wire a transformer before it arrives...

Edited March 11, 201214 yr by El_Doug

Why are people using CMF60 resistors for the bias ballast? Doesn't anybody read the bloody spec sheets?

I suppose because theyre prettier, and that several companies have made it seem like the Vishay/Dale name automatically makes things better.

"So what if theyre only rated for a 500v maximum? Theyre cool!!!"

Why are people using CMF60 resistors for the bias ballast? Doesn't anybody read the bloody spec sheets?

Yeah that plus people not knowing what they are doing. Vishay is basically an umbrella for everything now but they do own BC (aka Philips) so that opens up a lot of good stuff. These are the ones I use:

http://www.mouser.co...XoJNmZF%2flI%3d

Edited March 11, 201214 yr by spritzer

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Edited November 11, 201510 yr by JoaMat