Recent Posts

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I believe it's the solvent the culprit, not the ultra sounds. What did you use?
I intend to buy a supersonic cleaner and read/watched many tuts; it looks like isopropanol in distilled water is harmless to most plastics; again I wouldn't use it with PVC.

Just water and a little bit of dish detergent, same as I use for hand cleaning sunglasses. Those Oakley "glasses" were a multilayer composite of materials, and at least one layer started to peel of.

Isopropanyl in itself is indeed harmless to most plastics, but an ultrasonic cleaner can really put a strain on materials. And the glue used to bond the diaphragm to the capsule might react with the isopropanyl.

I cleaned all the really grimy fader caps of my current console by soaking them for a few days in cold water and dish detergent. They look good as new and the markings stayed on. On my previous console I cleaned them in an ultrasonic cleaner, which was quicker, but the texture got rougher - and I had to re-draw the markings by hand.
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Drawing Board / Re: Api-312 500 series style build
« Last post by Spencerleehorton on Today at 07:09:28 AM »
Yeah my website is a bit up the spout, if you reload it, it does come up?

Need to rebuild it really

Both channels bd139, bd140 are both getting scolding hot after about 3-4 minutes with 100uf in?

Just wound another input txf, tested it, checks out fine, no shorts, dcr good, inductance great.
Put in channel 1 and I get cut off waveform and when I adjust output level, all the way up I see waveform cut off top, all the way down I see top part of waveform but no bottom!!!?
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I've destroyed quality sunglasses (Oakley) with a supersonic cleaner. Knobs and fader caps I put in there had a different texture afterwards.
I believe it's the solvent the culprit, not the ultra sounds. What did you use?
I intend to buy a supersonic cleaner and read/watched many tuts; it looks like isopropanol in distilled water is harmless to most plastics; again I wouldn't use it with PVC.
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The Lab / Re: The Rude Tube
« Last post by flintan on Today at 06:54:10 AM »
Links and images in the first post seem all dead. Anyone got the schematics and/or audio samples? I'm toying with an idea to build something similar, would be interesting to see/hear.
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Black Market / Re: RFT / RFZ V470 vintage german micpreamp
« Last post by Pusch3l on Today at 06:25:49 AM »
Pm sent :)
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Black Market / FS: DDA D-Series Channelstrips
« Last post by jensenmann on Today at 06:21:24 AM »
Hi group

I have a few DDA D-Series Channel strips left over. It´s the theatre version with individual group routing. The micpre is identical to our green pre project.  All channels have Alps faders. They are complete except the fader knob is missing and they are literally unused.

Let me know if you´re interested.
thanks,
Jens
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Ive cleaned one U87 that the owner made a botched attempt at cleaning and damaged the front surface of the capsule . After using the standard method same as shown in the video , a very soft paint brush ,squirrel hair most likely and purified water as the solvent. I ended up flipping the capsule back to front . Im not sure if frequency response was effected by reversing the capsule  but it worked without crackling hiss and spitting sounds afterwards, my guess is in the cardioid position damage to the unconnected back side didnt matter .
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Drawing Board / Re: Getting started with audio circuits?
« Last post by merlin on Today at 05:39:21 AM »
I'm very interested in 500 series modules and was wondering if there was any easy workflow in adapting regular circuits to the 500 series format?
500 modules work in exactly the same way as your breadboard circuits, they're just squeezed into a 500-shaped box. You still have in, out, and bipolar power rails. That's all you need to get started.

Quote
what is the best way to send audio and return it?
Not sure what you mean by that, but if you want to make your life easy you can just drop in an INA IC to unbalance your signal, then feed it into your breadboard circuit. Then you can use a DRV to balance it up again on the way out. Yes there are other ways, but if you're still learning then you might prefer these one-chip solutions to begin with, so you can focus on the interesting stuff inbetween.
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Drawing Board / Re: Api-312 500 series style build
« Last post by ruffrecords on Today at 05:32:34 AM »
Hi Spencer. I just clicked on the link to your website and got an error message. It says "There has been a critical error on your website." followed by a link to 'Learn more about debugging in Wordpress'

Cheers

Ian
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Dynamic Processors / Re: GSSL HELP THREAD!!!
« Last post by Harpo on Today at 05:27:24 AM »
Is 18V too far off the 15V it's intended to be?
AC mains voltage isn't a constant and might vary by +/-10%, depending on location or time of day.
15VAC is the secondary voltage at rated load, that will be higher by maybe 15% unloaded (look up the datasheet of your transformer for the voltage regulation % number of your mains transformer).
For a high mains and transformer unloaded scenario, this 15VAC might give 15VAC * 1,1 for 10% high mains * maybe 1,15 for no-load = 18.975VAC.
Your 18VAC unloaded transformer readout (between center tap and an outer secondary end = 36VAC between both secondary outer ends) is within specs.
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