PURE M3700 Bedienungsanleitung PDF herunterladen (Seite 20)

#16

Originally Posted by miroslav

Oh...as an aside for all the 3500 users, I also have the LA-3500 balancing conversion kit...though I've never

gotten around to installing it.

I obtained it a few years ago on eBay...mainly 'cuz I know they are harder to find than hen's teeth (got it for

about $100 only!!!)...

..but I've been running my board without it for so long, just didn't see the need to convert it to a full balanced

setup.

If I did, I would then have to rewire a good deal of my patchbays...and make some other changes...etc...so

I've let it go.

If I ever land a 24-track 2" that's full-balanced...then I will probably make the switch.

Sounds a lot like what I would have done, had I had the possibility to get my hands on an LA-3500 conversion kit.

Can you tell me a bit more about those conversion kits? What is modified? Tape Ins, Line Ins? D. Outs? Groups? Aux?

What do these kits consist of?

I looked into using the Tascam LA-80/81 or LA-40 line driver units but they're quite expensive and so far I have

missed all the auctions where those units were sold used. They're quite expensive when new (EUR 399 for 8 channels

one way or 4 channels two way). My ATR-60/16 has only balanced IO and I want to hook it up the right way, so I'd

need four(!) of those units. That would be an additional EUR 1,600 and I surely don't want to spend that much

money. I could have bought a 3.000ish board right from the start then but I wanted the M-3500. It had to be the

M-3500.

Quote:

Originally Posted by miroslav

Yeah...like sweetbeats said...TASCAM (up until a couple of years ago) was still most stocking parts for the 3500

boards...so check with them before you get something generic.

I found you can get the Alps Faders from Mouser Electronics...but they ain't any cheaper than what TASCAM

charges.

Since you are in Germany...you can also try: http://www.newark.com/

They are here, but pull from their European sources, and they too carry Alps faders last time I checked...a bit

cheaper too!

Thanks for the link! I'll definitely check them out if I need something.

Quote:

Originally Posted by miroslav

Oh...here's the link to the guy who went nuts on his 3500 with upgrades:

M-3500 Upgrade

Wow, great read! I read the other parts, too. Quite entertaining (the technical parts, not the "disagreement"). Here

are all three links.

Rechipping results part 1

Rechipping results part 2

Rechipping results part 3

Nice way to put it miroslav, so the "guy who went nuts on the M-3500" is Ted Spencer. After reading his posts I hold

him in very high regard due to the accuracy with wich he did his tests. He summed up the reasons why he did the

mods and what the mods consisted of as follows.

Quote:

Originally Posted by Ted Spencer on rec.audio.pro

The original 4580s (22 cents apiece) were *very* loose in the low

end, and had quite high distortion especially in the upper mids and highs, but

could be whipped into sounding pretty good if you knew how to work with them.

It should be noted that Jim (Audio Upgrades) also redesigned parts of the circuit, removing a few components

he deemed unnecessary or deleterious and adding some additional very high quality caps and other parts.

Among other things, this redesign shifted the eq's shelving center frequencies up from 10K to 12K and down

from 100 to 80, and moved the upper sweep mid eq's top freq to 20k from 11k. I like these parts of the mod.

Maybe I'll contact Jim from Audio Upgrades and ask him about a "kit" for the M-3500 without the op amps as I want

to be free and experiment on them. There is quite some talk about the newer op amps oscillating madly at 1 or 3 Mhz

and I'd like to know if Jim did something to prevent that, like some additional caps or something. The EQ mods sound

very promising, too (at least to me). I'd want to do the modifications just for kicks on a 4 channel module and A/B

them. I think it will be fun.

Cheers

Tim

__________________

http://tubegeek.de

03-02-2010

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