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91
Drawing Board / Re: Cheap's 73 EQ (previously Poor Man's 1073)
« Last post by krabbencutter on December 07, 2019, 04:05:14 PM »
Yes, but the headroom & THD+N will depend on your supply voltage and the opamps. With a +/-12V PSU und NE5532 it can handle input signals up to 3Vpp before it starts clipping (The Sound is in the Silicon  ;D)
92
Drawing Board / Re: Simple EQ for Neve 1290
« Last post by ruffrecords on December 07, 2019, 04:02:04 PM »
I think the most useful question at the moment so I can move forward is what is the signal input and output for the b205 Pcb?

It sits around one of the inverting amplifiers in the BA284. One of these has its input on C and its output on E. The other has its input on K an its output on M.

The mic pre output is from pin P of the BA284. This feeds the bypass switch and also pin F of the B205 so that will be the input. Its output is from pin H which also has a connection to the inverting amp (EC) in the BA283. The output  pin H then feeds the BA211 pin P (its input) and this has the other inverting amp (KM) in the BA284 wrapped around it. The presence output is from the BA211 Pin C which via  1K2 resistor feeds the BA182 HPF board. The output of this is the wiper of S4b which then goes to the other side of the bypass switch. With the controls flat of off you should be able to see the same signal level at all these points. Divide and conquer.

Cheers

Ian
93
Studio A / Re: Matching vintage speakers - FabFilter Pro-Q...woah!
« Last post by Rocinante on December 07, 2019, 03:32:19 PM »
Ironically I use Fab Filter to hi and low cut everything. I use the Pultecs for flavor.

Something's not quite right. I have two early ribbed re-coned 50's Jensen P12Q (Q=40W vs R=25W). And the funny thing is that one actually looks exactly like that original one with the beat-up green bell housing. The problem I see is that they shouldn't sound that different. Mine both sound exactly the same. I would say either the re-cone was not done perfectly or the original one is just more "broken in" (makes me think abbey road d enfer is spot-on).

As an exercise, I once used a dummy load to run dry through an old inductor graphic EQ and adjusted to match Jensen's published curves for the P12Q just to see how close it was. It was very convincing. But just crushing everything above 5K and making the 15dB dip-then-boost to 2K with a broad dip at 400 was pretty close too.

I love those speakers. I mix them with the monitors when listening to music or even watching TV. They add a pop for sure. Most speakers are pretty flat by comparison. For recording voice and other mid-frequency instruments, the radical high frequency crush of an old Alnico speaker is hard to beat. Band-passing in general is underestimated IMHO. I love high/low cut filters like the Pultec HLF3C. I high/low cut just about everything to some degree. Almost as effective.
94
Studio A / Re: SSD for older DAW computer worthwhile?
« Last post by Rocinante on December 07, 2019, 03:29:50 PM »
Yes. Big time. I'm running an HP z800 And it made a world of difference. I actually have 2 ssd and 2 hdd. One for start up, DAW's, and processing, the rest for storage.
I duplicate my ssd as I have read they can die but so far nothing has happened in the past 5 years.
95
Black Market / Re: Looking for a 600 ohm stepped attenuator
« Last post by beatnik on December 07, 2019, 03:10:52 PM »
You could get a custom made switch from Blore-ed and make it
96
Black Market / Looking for a 600 ohm stepped attenuator
« Last post by David Kulka on December 07, 2019, 03:06:07 PM »
Hi, I'm looking for a 600 ohm stepped attenuator.

20 steps, detented (not smooth turning) 2 db per step, threaded 3/8" bushing. Max. diameter 2 3/8". Thanks in advance.
97
Magnetics / Re: BA-6A Input / Output Design
« Last post by wlinart on December 07, 2019, 02:50:58 PM »
I don't know the specifics about it, but i looked at the specs sowter provides.
For the input they say it's a 600/150 to 10K. Edcor has a 600 to 10k model, so that's maybe an option? Carnhill has some output transformers of 10k:600, so maybe one of those in reverse? Although that may be no a good idea, don't know exactly.
The interstage from sowter is a 10KCT/10K. Edcor and carnhill both have a 10k:10k model, so that should be easy.
The output is a 8k:600, which is a common value it seems for push pull output amps, so that should be easier to find. Edcor has one as well: https://www.don-audio.com/Edcor-CXPP10-600-8K-Push-Pull-Tube-Output-Transformer

I hope you find something! Good luck!
98
Brewery / Re: Any IT people here? Stacked switch vs daisy-chaining-what do I need?
« Last post by PRR on December 07, 2019, 02:48:31 PM »
> 27 rooms.  ....at the most around $300 each.

Tell the staff they are only worth $11.11 each.

Remember that networks always EXPAND. I counted my building's  jacks closely. By the time the installer came I knew I'd need 30% more (wasn't on the job-order, didn't get done). Over time I found unexpected HVAC and (insecure) security boxes tapped-on. Cameras. Vending machines. WiFi. One guy (yes, me) grew from one jack to 9 jacks.

Some of this can be done with $59 hubs in-room. (That 9-jack pig liberated a slow 16-port from parts unknown to split his one connection into 13.) But do too much it becomes a management and debugging headache. (The 16-box user could only complain to himself...)

You want a 48-port switch and 2" of empty rack for another 48 in 2025.

If your staff is all about Facebook and cats on You-Tube, I would not worry about chaining 100-speed switches a layer or two. If it is researchers or music producers transferring many-gig files all day long, you need it neat and direct (and surely more than $300).
99
Magnetics / Re: Custom Output Transformers
« Last post by Tubetec on December 07, 2019, 02:31:16 PM »
Can't the series/parallel pri/sec coils  be rearranged to allow for other impedence ratios  ie 1:1 or 4:1 or  step up  ?
100
Dynamic Processors / Re: GSSL HELP THREAD!!!
« Last post by Sinkia on December 07, 2019, 02:09:54 PM »
Hi everybody !

I'm finally ending building a really simple GSSL I bought from Gustav !

I just have one concern regarding the power supply wiring...
On his doncumentation, it show you have to make the secondary 30V, and the wire only those 3 points to the PCB.

I'm a bit of a junior, and I'm just wondering if this the right things to do ?

Many thanks all
Sinkia
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