The J309 will operate up to 25V Vds with the spec sheet listing 10V as average operating voltage. Once the signal path is clear you can start adding other mods as you chose and actually HEAR a significant difference with what you are altering.Â, http://www.mark-o-matic.com/media/cap-cab-orig.wav, http://www.mark-o-matic.com/media/cap-cab.wav, http://microphone-parts.com/rk47-microphone-capsule/, http://microphone-parts.com/capsule-installation/, http://en.wikipedia.org/wiki/Faraday_cage, http://www.mark-o-matic.com/media/fv-2-orig.wav, http://www.mark-o-matic.com/media/fv-2-k47.wav, http://www.mark-o-matic.com/media/LouCabs-mods.wav, http://www.mark-o-matic.com/media/DrumRoom-V69.wav, http://mark-o-matic.com/media/up2-fv-o.wav, http://mark-o-matic.com/media/up2-fv-f.wav, http://www.mark-o-matic.com/media/Acoustic-all-stock.wav, http://www.mark-o-matic.com/media/Acoustic-all-mods.wav. AND on some mics (this is one) the base also works as a faraday cage.  Left is original , right is the mod. Michael Vecchio of The Deli Magazine reviews the OktavaMod MXL v69 Tube Condenser Mic Modification.  Since the mic does not have a low end rolloff, if you're into that or find you often use a rolloff switch, then you may want to stick with 22u. Always take lots of pictures!  Right?Â, I checked and rechecked.  I wanted to see what the cap change might have done BEFORE I swapped out the capsule.Â, TECH NOTE - I no longer own any pres that are not tube based, nor do I own any rack pres that haven't been modded or tweaked by me somehow. Write a review. Brand New. That is C7 on the tube board, and C13 on the FET board.  While the 5814 is designed to spend very little time in cutoff (you can actually damage the tube if long periods of cutoff are experienced by the tube, and some data sheets will warn against this,)  the 5963 is designed TO spend long periods in cutoff, primarily for digital or other on/off circuitry. A possible follow up item.Â, My assumption is that the 1000u big cap is power smoothing, or at least that's what I would be doing with that cap, so Im leaving that as is too.Â, POWER SUPPLY - Now let's take a look at the power supply.Â, What do we have here? If you find your V69ME to be too bright and peaky, you could certainly exchange the stock capsule (MXL's usual 32mm K67 type) for our RK-12. Its circuit is somewhat unusual in that it is a 2-stage tube/fet design, with solid-state amplification following the initial tube stage. Es hat für meinen geschmack aber ein bisschen zu viel glanz obenrum ab 10kHz obwohl seine Kapsel ja bekannt ist das sie smoothe aufnahmen erzielt und nicht sehr harsch klingt.  What I have recently discovered is that for doing quick tests,  using distorted guitar as a source will usually bring out some of the nuances of a small change in a slightly exaggerated manner making it easier for the ear to detect. An analysis of these circuits reveals problems in both stages: noise, distortion, sonic clutter. Free shipping.  The stock cap was a 2.2u if you'd prefer to stick with that value. We have had customers do that, with good results.  Well I guess if I was going for 50's I'd use a ribbon mic, but just goes to show how subjective these things can be.Â, Female Vocals  Clip 1 - Stock Mic - http://www.mark-o-matic.com/media/fv-6-orig.wav, Female Vocals  Clip 2 - Modded Mic - http://www.mark-o-matic.com/media/fv-6-mods.wav, Guitar Cabs  - I think this mic really excels on guitar cabs. If someone finds a way to squeeze a film cap in this location, let me know and I'll update the info here.Â, For C3 i think a polystyrene would sound best, but I had trouble finding one of the right value. over time, … I also just happened to have a few extra of that value from working on an old Ampeg guitar amp.Â, if you look at the schematic you can see that the coupling cap connects at one end to R9 as well as Pin1 on the tube. The J309 happens to be within specs for the biasing currently on the unit with no modification.Â, So for this first part of this update we will swap out the K170 FET for a J309 FET. Stay tuned.Â, Lets talk about FETs for a second. It could be a coupling cap, or it could be in parallel with the large output cap. Burn in time was only about an hour at this point. It looks like a blob of solder but there is actually a tiny silver wire in there.Â, I was uncertain what effect this may have. A transistor will generally distort at its peak in an obvious and immediate manner, and I have not detected this so far in my test. ), Switch access from inside the mic  Note the proper use of heat-shrink tubing on the connected wires as opposed to electrical tape.Â, If you don't have a heat gun for the smaller heat shrink tubing you can gently rub the upper (and cooler) portion of the soldering iron gently against the material.Â, With the new capsule in place I really was expecting to hear a pronounced difference. I decided to try a .047u which is many times smaller than what came stock with the mic. The mic now sounds much more like what I'd expect a K47 mic to sound like. MXL mics deliver high quality sound on par with far more expensive mics.  These two wires will be soldered to one of the switch terminals on the edge. Lets take a look at a textbook example.Â, Without getting into the math (the uber geeks can use google or there is a small reference in Morgan Jones' "Valve Amplifiers" book 4th edition  - page 102) at a very basic level what we have here is a feedback amplifier.