i'm on a roll... the kgsshv

[swt61]

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

[wink]

"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.

[Kerry]

Nice looking build

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

[eggil]

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.

[kevin gilmore]

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

and get reliable results.

[eggil]

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

[spritzer]

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?

[kevin gilmore]

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, 2012 by kevin gilmore

[swt61]

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!

[kevin gilmore]

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

[Victor Chew]

Eggil, have you powered up yet?

[eggil]

No, waiting for the transformer.

Will be drilling holes in the heatsink on friday.

Edited March 8, 2012 by eggil

[johnwmclean]

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

[eggil]

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.

[johnwmclean]

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

Edited March 8, 2012 by johnwmclean

[luvdunhill]

Why two layers of angle brackets?

[eggil]

Actually it will be only 1.

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

[eggil]

Well, drilling the heatsinks was harder than I thought!

Hope didn't screw up anything.

Edited March 10, 2012 by eggil

[Victor Chew]

Nice work eggil.

[TMoney]

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

[El_Doug]

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

Edited March 11, 2012 by El_Doug

[spritzer]

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

[El_Doug]

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?

[spritzer]

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, 2012 by spritzer

[JoaMat]

/

Edited November 11, 2015 by JoaMat