Recent Posts

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Microphones / Re: Rode NT1 Kit (the black one) Mods
« Last post by Whoops on Today at 08:34:44 PM »
Sorry, forgot to ask,
what do you personally would like to improve on the NT1?
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Microphones / Re: Rode NT1 Kit (the black one) Mods
« Last post by Whoops on Today at 08:33:43 PM »
Nice, would like to try that out.

How do you like the sound?
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The Chamber / Budget 192khz A/D
« Last post by Tubetec on Today at 08:28:56 PM »
I was looking around for a small A/D board for Rew measurements and other general audio purposes .

https://www.audiophonics.fr/en/devices-hifi-audio-adc/stereo-adc-board-wm8782-i2s-24bit-192khz-p-14897.html

i2s interface , set up with jumpers and switches ,two clock sources ,  filter components on the inputs which could be re jigged for better HF extension compared to  usual comercial interfaces  . Specs dont look outstanding only manages 100db s/n and -93 THD, still might be a cheap way of making a wideband input to REW .

A USB/i2S interface is also required , any suggestions welcome .

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Drawing Board / Re: Optimal Jazz Bass summing resistor values
« Last post by john12ax7 on Today at 08:23:38 PM »
I would imagine you already have significant high end loss with 220k. In a guitar with a 6k pickup,  and no series resistor, it's very easy to hear the difference between regular cable and low capacitance cable.  Bass is lower,  but only an octave, while you are increasing the series driving resistance by way way more than 2x by going to 470k or 1M.  Imo you should be lowering the series resistor,  if anything,
to regain some high end clarity. Then again there is no right way to make a tone and you might like the effect.
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Brewery / Re: Brexit
« Last post by Script on Today at 07:59:19 PM »
61 deals and more pending ? Good.

GBP43 in the UK ? Well, then we do get it at a somewhat reasonable price iI guess. But TBH, I'm looking forward to more British beer ;) Now all we need is to get this stupid pandemic under control for it all to take off -- I see good progess in the particularly badly-hit UK.

(Meanwhile, wife ordered apparel from a French company. It's all made in China anyway, but can't order from there.)

Skol, cheers and kampai.
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Microphones / Re: Rode NT1 Kit (the black one) Mods
« Last post by kingkorg on Today at 07:28:45 PM »
Here's a circuit mod i came up with. I had a 22mH inductor so i worked around that one. This gives the mic flat-ish response. Reminds somewhat of u67 response. Some trace cutting necessary, smd tinkering, so not very DIY friendly.



Here's before and after, and filter response curve on the top.
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Microphones / Re: Behringer B2 Pro mods?
« Last post by kingkorg on Today at 07:09:22 PM »
I have tried Oktava, edge terminated like rk12, different k67, k47, sdc mxl603, and edge terminated from 797. I tried oktava from 36 to 60v. Made no difference.
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The Lab / Re: Vintage Yamaha 1204 Mixer Opamp upgrade
« Last post by analogguru on Today at 07:06:30 PM »
IIRC the 4562 is not compensated for unity-gain...Would be good for summing amps and maybe mic pre, but not for tone controls and to be discussed for post-fader amp.
Then the NJM4560 is your choice, but better noise (and slew rate) performance are only relevant when there IS some gain.
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Drawing Board / Re: Optimal Jazz Bass summing resistor values
« Last post by okabass on Today at 06:36:25 PM »
Probably not. With 220K resistors the loss with be close to 6dB. You could increase them to 470K with little change in the loss and a noticeable reduction in interaction. You could increase them to 1Meg but then you get increased loss and possibly loss of top end due to cable capacitance (but this may not matter for bass). I would suggest trying 470K.

Cheers

Ian

Hi
Ok, I'll try those.
Thank you very much for your analyse and advise.

PS Looked your site. Very interesting. I'm also interested in tube gear. I've for example built an SVT-type 300 W bass amp.  Some Pultec type eq , some guitar amps etc.
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The Lab / Re: Vintage Yamaha 1204 Mixer Opamp upgrade
« Last post by analogguru on Today at 06:31:01 PM »
.... I must be thick, but I don't get it... :o
Language barrier, perhaps...?....
So if you have a closer look at the highlighted area you will see a 47uF electrolytic cap beside an 15k power-resistor which gets hot during use - sometimes both even touching each other.  You can be sure that this electrolytic will be dried out with time.  Even if you leave the 47uF in place and bend it above R10, R11 it would be better (and a cure).

And here we have a 100uF/63V FRAKO electrolytic cap produced in 1978 and as can be seen, heavily used in a computer board (from Kienzle).  You can see the values for yourself now 42 years later:



And BTW: yes I measured all three capacitors with similar values - there were not more.
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