Category Archives: Electronics

Tube rolling in the PV14L

The C-J PV14L preamp is not exactly the best candidate for tube rolling, but I do have some experience with the dfiference that tubes can make.  The PV14L only uses one pair of tubes, as the preamp only has one gain stage.

IMG_20160304_185514The second version of this preamp (which mine is) was built around the Mullard M8080/CV4058 tube.  When I received the preamp, it sounded good with the tubes provided, but I found that they were highly microphonic, exhibiting a rattling noise on certain loud notes.  I had ordered in a pair of Tung-Sol 6C4s to try.  They sounded slightly better, yet there was still some evidence of microphonics.  Just not as pronounced as the Philips ECG 6C4s I had replaced but still unacceptable.

When the Mullard M8080s came in (from a UK seller), right away I noticed that there were no microphonics whatsoever.  Sonically I did not notice a huge difference between these tubes.  If anything, the sound was slightly more mellow and balanced with the M8080 than with the others before it, the Philips ECG tubes perhaps being the brightest and maybe slightly more etched of the pair I tried. However, these latter tubes had an unknown lifespan on them–I believe the seller mentioned they were about “halfway used.”

In the meantime, I had gotten in some silicone o-rings to try as tube dampers.  A bag of 10 properly sized o-rings is only a dollar or two; some audiophile tweak companies charge ten times this amount for the same thing!  There is no difference.  In fact, the silicone o-rings that ship with the PV14L are the same material, just of a smaller thickness.  The inner diameter of these tubes is tighter, so it takes a little more effort to place on the tube.  But, that should assist in better dampening.

As one of the M8080s has gotten noisy (the seller is thankfully sending a replacement at no charge), I placed the 6C4 Tung-Sols back into the preamp.  The thicker tube dampeners have made only minimal difference in the microphonics of these tubes.  Dampeners can help with by reducing some of the vibrations but, of course, will have no effect on any of the tube components physically rattling inside the glass.

Seeing there aren’t many options in this family of tubes, I will stick with the M8080s.  The CV4058 is actually a military spec tube, made to more durable specs and tight tolerances, hence the absence of the microphonics.  There are still plenty out there, and it is not a popular audio tube.  An older McIntosh component used the 6C4, and C-J has used this in three of their preamps.  These tubes do so much right that I don’t really see a point in changing out the tubes for a different sound.

Media server project

I am currently using a Seagate Central as a temporary network drive.  I had a WD My Book Live die on me, and it took me over a week to pull off not quite 2TB of data using the DiskInternals Linux Reader application.  With that and other media I’d collected since the My Book Live died last July, I’ve filled a 3TB Seagate Central to within 400GB of capacity.

My current path is a Synology DS214play NAS (network attached storage) box.  There are a handful of models in the DS214 series, but the D214play has the most powerful processor and a floating point unit, having the ability to transcode video and audio files on the fly.  Since I will be using this as a media server as its primary function, getting a unit capable of transcoding was a good move for me.

Why do we need transcoding?  Not all devices in the house can play the same video formats, and the DS214play will transcode them to the proper format while sending them across the network.  The excellent Mezzmo package for Windows 7/8 does the same, but I am not going to turn my desktop computer on, burning up 300 watts or more of power, just to send a video to one room in the house.

The DS214play does not come with hard drives–it is an empty 2-bay unit.  I have researched drives a bit.  My recent experience with the My Book Live, whose drive got corrupted after a simple power outage, has made me shy away from their products.  Although, their pricey “Se” and “Re” series drives are high reliability enterprise drives with a five year warranty and extra technology to help with error recovery and vibrational stability.  The WD Red drive is claimed to be an “enterprise” or NAS drive, but its poor 5400 RPM speed instantly ruled it out for me.

One drive catching my attention was a Hitachi, aka HGST.  Many server and cloud providers have used these with among the lowest failure rates in the industry.  Given the price on one of these in a NAS-duty configuration was $70 lower than the same sized 4TB WD “Re” drive, I decided to give it a try.

Having 4TB will take care of my needs for awhile, and the Seagate Central will be a backup drive, fired up occasionally to sync with the DS214play.  The My Book Live is still under warranty, so I will be replacing that as well, and may use it for a backup also, likely with less critical files.

The Synology NAS products are really well thought out.  Rather than having to hack them and install my own set of utilities, Synology has the ability to download applications that install right to the NAS without any hacking or special knowledge needed.  Bittorrent clients, the Serviio DLNA/UPnP server, a video surveillance recorder, and many others are available as add-on modules.  Very nice!

It is all coming together nicely.  Further progress will be posted here as it happens.

Pro-Ject Xtension 10 setup and first impressions

It’s been ages since I took delivery of a new turntable; then again, I’ve never had anything this advanced.  One should be a bit impressed when a 50kg crate shows up at the side door.  I felt like I was back to working in a warehouse again!  And it took all I had to maneuver it through the side door and up the landing into the kitchen.

The Pro-Ject Xtension 10 is well packed.  It comes in a wooden crate, with all the major components separated by thick stacks of Styrofoam.  Setup really is not too difficult, as it involves putting the heavy platter on the bearing, attaching the feet, and attaching various bits and pieces.  Lugging the finished unit to a suitable temporary table was a chore in itself, due to its weight.

The hardest part, as always, is getting the cartridge aligned and mounted, and that took awhile mainly due to the finicky setup parameters of the Ortofon 2M Black (the Shibata stylus needing to have exacting setup to perform properly).  Having plenty of adjustability in the tonearm did help–that is one drawback to the Grace tonearm, in that there were a couple of adjustments I could not easily make.  Not to mention the inability to align the cartridge to a Lofgren A alignment.

The alignment still needs some tweaking at this point.  I will have another go at it when my eyes are refreshed, and I can print a couple of different alignment grids to cross-check my work with.  In addition, I need a way to view the stylus rake angle, and that may involve borrowing or buying a USB microscope.

I can say, however, that my first impression is that the music has taken on a clarity and solidity I have never heard from my own vinyl before (outside of the demo rooms, of course).  On a rather new vinyl acquisition, Kevin Eubanks’ Zen Food (on Mack Avenue Records), the sound of the vinyl is so steady and clear that you’d swear you had a digital hi-res file playing back.  The quiet surfaces of this LP help tremendously.

Two things work in its favor for speed stability and clarity.  The platter of this turntable is massive.  Literally.  Its high mass acts as a flywheel.  But what good is a flywheel if it is not fed “pure” energy?  The Xtension 10 also includes Pro-Ject’s Speed Box DS circuitry built in.  It is not a filter (like a couple of other turntable manufacturers use).  Rather, it is a unit that uses DC voltage to regenerate a clean 60Hz sine wave to feed to the AC motor.  (AC motors’ speeds are determined by the input frequency, not the voltage.)  With the motor being free of the “crud” that comes off of our electric grid, the motor rotates without any of the variations or “cogging” that this crud can cause.

The high mass of the turntable also dampens vibrations from the vinyl itself.  You notice this by way of a “blackness” from which the music emanates, along with a revealed strength in the bass performance.  I noticed this when stepping up from my Denon direct-drive to the Walker, and now an even bigger step up from the Walker to this turntable.  Good 180 gram vinyl is almost whisper quiet now, and the bass solidity and strength is “nailed”.

I will get into comparisons with other turntables I auditioned locally, but the short version is that for the types of music I’m listening to as of late, the Pro-Ject offered me the most musical and natural representation of all of them (although the contenders were really close).  With the included dust cover and built-in Speed Box DS, and an incredible Audiogon deal, the whole thing kind of came together somewhat quicker than I’d imagined, being an incredible value.

The coming weeks will feature more tweaking and listening impressions. Stay tuned.

 

Motorola Droid: Four Month Update

The Motorola Droid has been an intresting experiment.  Basically just a small handheld computer, an Android phone loads a very small version of Linux, upon which you load all of your apps.  Part of it reminds me of the old days of DOS, when you had to watch your memory usage and fit as much as you could onto a floppy disk.

Android phones are no different than those old DOS computers I mentioned: you have to be careful to not overload your phone with too many apps, and not to run too many processes that could drag your phone down.  That old excitement of trying different combinations of applications and experimenting has returned!

Read on to share in my adventures with the Droid over the past few months.

Continue reading Motorola Droid: Four Month Update

The Bloom Is Off The Rose For Apple

While I normally don’t call out companies in my posts here, I can’t help but comment when a company completely falls all over itself trying to correct an issue.  As many know, the recent iPhone 4 debacle involves poor antenna reception when the phone is held normally in a person’s left hand while making a call.  Apple’s response for awhile was, “Well, don’t hold the phone that way.”  That’s like telling someone whose feet hurt, not to walk by using their feet.  Apple’s latest trick is to find any competing phone (read: Android, which has already surpassed them in activated units) and knock it down several notches by claiming these phones, too, have issues with reception if you hold them a certain way.

Well OK then, Mr. Jobs, don’t hold the Android phones that way.

Continue reading The Bloom Is Off The Rose For Apple