Wanted:Neumann HT75

[dhturbo1]

As per title,wanted neumann ht75 hi,lo pass filter module anybody know where i can find one.Thanks in advance

[petermontg]

Try vintagetools.de or vintagecity.de


If no luck something like that is pretty easy to wrap around an opamp yourself.

[dhturbo1]

Hi,I've already tried them with no luck.Thanks

[Sillitoe]

http://soniccircus.com/Neumann-Custom-Rack-with-Mastering-Signal-Chain-Vintage

[petermontg]

Jeez. That rack must be made of gold. 6K is a shocking price.

I used to have a pair of U473a here. I wonder how well matched those are to be used as a stereo pair.
Complete rebuild? Maybe?

[dietrich10]

The OE Duo is stereo yes?
3 stereo Neumann eqs+the pair of U-comps and the filters is a nice setup. I have seen the 495ST eq sell for 1200$ and the OE is better?

[dhturbo1]

Hi all,i realise that finding a HT75 is like finding a needle in a hay stack so I've decided to go a different route with this & have now decided to go the diy road so if anyone has a modern schematic of a hp, lp filter circuit that can be used in the cutting chain & they don't mind sharing or selling me a copy please pm me.Thanks again

[dietrich10]

I'd recommend looking for a used Dangerous Music Bax.

[gold]

How about an HT75 schematic? I have one of those.

[dhturbo1]

Hi,I've sent you a pm.Thanks

[gold]

Sent the schematic via email.

[petermontg]

Hi Paul,

Any chance of sharing schematic also.

Best
Peter

[dietrich10]

If anyone decides to build similar I am always interested in a 4 channel hp/lp 1rU option

[Aussie0zborn]

I have one HT75 and need another. If you are building a few, please let me know.

[petermontg]

I will stick together a build and test.
If everything is correct I will have 3 PCB left over from the shop.
It will probably be a few weeks before I sit down to look at it. Pretty flat out.

Your welcome to the PCBs for the cost I paid for them.

Just be aware they will be in Danner Cassette format.

So D, OZ have dibs which leaves one left. Arthur?

Best
Peter

[Aussie0zborn]

Hi Pete,

Yes put me down for one. Danner cassette format is perfect. Even better is it if looks exactly the same as the original HT75 like this:
http://s78.photobucket.com/user/yenkell/media/DSC03127.jpg.html

[petermontg]

Cool. It will stay true to the original design but maybe new opamps 24volt. but considering the PSU is off board if you can find the 15v originals pop them in.

How the board is orientated will be a bit different than the original.
I have no source for the 4ganged selector switches with the 50k pot before selector that are in the original.

If you get a chance Mike to open yours and see if there is a manufacture and part number on them that would be great.
I have some photos of the guts here but nothing detailed enough to read those part numbers.
They are not the same so there should be two part numbers.

I managed to do a dirty single layer layout while on the bus.
The original had some jumpers so dual layer is the best approach.

Also all parts are available from mouser and the semicondutor from Digikey.

It would be nice to mount 4 channels in one chassis but not possible from quick looking.

PCB will be stereo.

Or to save all the waiting around and hassle.
Considering its a single layer......
Does someone want to lend me their HT75 and I can stick the PCB on a scanner and just trace and etch a bunch of PCBs here exactly to the size and exact layout.

[audiocarver]

I'm using the HT66s here, and they work great....but I would prefer to move onto something like the ETEC DBTL20. If your going to build something, perhaps take a look at that.

Some folks like the HT66 over the HT75's but I don't know why though? I would think the HT75 was more feature oriented because it was newer, at the very least.

[gold]

I don't think you will be able to find the original switches in the HT75. I've looked with no luck. I'd suggest substituting relays for the switches.

[dietrich10]

I am curious why a clone build of a vintage hp/lp versus a new option?