I believe there have been many reports of power switch failures on that type of amp.

Chopsticks are your friend when poking around in a tube amp.

Save your money. No point taking a step back. Spend it on a good source. The Magnum does everything well. But in particular.. to me.. is how realistically hi-hat and cymbals sound. I find that is what most headphones fail to reproduce well. The new "high-end" Grados are un-listenable to me...

Quote: I have both.  As good as the MS-Pro is, the Magnum is better.    

The only way I deviated from Tom's build is the physically smaller coupling caps and the volume pot is ungrounded.  C7/C8 not populated.         Neither of these tubes hum.  Rogers (Mullard) 6J6 on the left and RCA 5964 on the right.  They're the only two pairs I have.  ...

Don't know what it is about my build that may be different, but I can't detect any hum.  Had it out to a mini meet last night and no one could hear any either.  Sounds great with Grados, and can drive a K340 even though it could use a bit more gain (for quiet recordings).  Thanks to Tom and Doug...

Did you measure with a load on the output?  Headphones or dummy load?  If you didn't, then you are just seeing a partial charge on the output caps, since it has no path for discharge

Shipping is killer on large transformers.  Why not get what you want/need and go pick it up.  Both Plitron and SumR are local (GTA).  Plitron would probably be the easiest to get to from where you are.

Quote: Originally Posted by Beefy Worked a treat - thanks! I used "common 3d" nails (37mm long, 2mm wide), cut to the appropriate length. Heatsinks are now all tapped and ready to go

Quote: Originally Posted by Beefy Can't help you out on listening impressions, but my parts from Mouser did arrive today. I had no idea the reservoir caps were so huge Off to a great start with the heatsinks...... of 8 pins on the big sinks, 3 came out clean, 2 sheared off clean...

I'm using 100k with Grados and they are very efficient.

Some pics for TomB And before anyone asks... no, I am not using any LEDs. Thanks go to tomb, dsavitsk, n_maher, and of course pmillet.

HeadWize - Project: The Morgan Jones Mini Tube Headphone Amplifier by Chu Moy

Quote: Originally Posted by Lifthanger This is my very first PCB layout. If someone is interested, I could post the BOM and eagle files. It's PMillets design and I tried to get it in one layer to diy the board. Reason for posting this here is as a sanity check. Never did that...

Quote: Originally Posted by Lifthanger thanks sachu and looser! the reason I'm doing this on PCB is, because I've finally got some free time, to learn eagle and try out the toner transfer method. No harm in that. Have fun.

Or you can just buy a kit for $24. Just add a transformer. KIT

Quote: Originally Posted by Lifthanger I realize this is not the best timing, but could you tell me which common mode choke you used? I found this TKD one TDK|ACM7060-701-2PL|DROSSEL, GLEICHTAKT, 700OHM, 4A | Farnell Deutschland 4A max (I'll use two of these boards, so it'll see at...

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Looks like the hard work is finally coming to fruition! Looking at this as a future upgrade to my MS2i. WEBSITE

6N6P should work but it's at it's low voltage limit. Doesn't hurt to try. 6H30 is a bit better suited for lower voltages. For reference

2A @ 6.3VAC or 1A @ 12.6VAC

Quote: Originally Posted by smeggy Well dogpoo! I was just looking at the prices for them thar toobs... erm, I'll stick with what I have for now You don't need the DR's just get some Sovtek 6H30s (and a bigger transformer ). Looking good!

...and the crowd goes wild.

Quote: Originally Posted by sachu yeah the way i have my heater wiring laid out, they pretty much go past the signal wires..hence i went with a LDO reg DC supply. Even better. How are the 6H30's?

Quote: Originally Posted by sachu You are sure to have noise on the outputs this way. I did on mine and with orthos that too. Try connecting a small cap (.1uF) to ground on one of the heater pins. Also make sure heater leads are tightly twisted and not near any signal wiring...