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REVIEW: Yarland P100 tube headphone amp (pics) - Page 3

post #31 of 204
Here's the website of the European distributor:

Crafty :: home
post #32 of 204

Yarland P100 hum solution?

I bought the P100 (new from TSTO) a while ago but have been unable to get rid of a nasty hum. It occurs on any A/C receptacle in my house (including isolated ground circuits installed for home theater equipment) and at two other houses on different utility lines. However, it mysteriously vanished when I took the amp back to the dealer: perfectly quiet.
By process of elimination I know that the hum is unrelated to headphones (tried Senn 650s and others), impedance setting, power cord (with or w/o 3-prong adapter), gain level, or input source. Haven't tried changing tubes as the stock ones worked fine at the dealer's.
Has anyone had and solved a similar problem? Should a power line conditioner help?

- perilymph
post #33 of 204
Thread Starter 
Maybe try a DC blocking power conditioner? Perhaps you have some DC on your AC...
post #34 of 204
I''ve had the Yarland for two years now and anytime I got hum it turned out to be tube related.Did you talk with Dave at TSTO to see what he thought?
post #35 of 204

Yarland P100 hum solution?

Quote:
Originally Posted by Skylab View Post
Maybe try a DC blocking power conditioner? Perhaps you have some DC on your AC...
Could be... it sounds like it's predominantly 60Hz, so I assumed some type of ground-related problem. But the occurrence in 3 different houses seems to indicate the cause is not upstream.
I'll try feeding through a power conditioner and see if that makes it go away.

Thanks!
post #36 of 204

Yarland P100 hum solution?

Quote:
Originally Posted by Fairbanks View Post
I''ve had the Yarland for two years now and anytime I got hum it turned out to be tube related.Did you talk with Dave at TSTO to see what he thought?
Dave did look at it when I took it into the shop, but they were unable to replicate the hum there. Presumably a cleaner power source than the other places I've tried it.
Thanks; will post again if I find a fix.
post #37 of 204
i don't know about that. i've been using p100 for over 3, 4 years now. no hum, no hiss. by the way, mine is an old, older version. i'll post some pictures when i get a chance.
post #38 of 204
Thread Starter 
My Yarland p100 did hum. It hummed at a variety of outlets and with a variety of tubes. But not with headphones over 200 ohms.
post #39 of 204
Quote:
Originally Posted by Skylab View Post
My Yarland p100 did hum. It hummed at a variety of outlets and with a variety of tubes. But not with headphones over 200 ohms.
I tried several different headphones, mainly the Senn 650s (300 ohm rated impedance) and the Atrio M5 IEMs (32 ohms). The hum seemed about the same, allowing for different sensitivity. Subjectively it's about as loud as the Yarland's hiss at a little over half gain (no source signal, amp circuit noise only). Very noticeable when playing softer musical passages.

Thanks for the further comment; will post again once I get ahold of a power line conditioner.
post #40 of 204
Hi guys!
Have anyoane test this headphone tube amplifier with Sennheiser HD595 (50 ohm)?
How it's sound compared with Meier Corda Arietta on the bass ,highs, soundstage?

Thanks!
post #41 of 204
Quote:
Originally Posted by Adu View Post
Hi guys!
Have anyoane test this headphone tube amplifier with Sennheiser HD595 (50 ohm)?
How it's sound compared with Meier Corda Arietta on the bass ,highs, soundstage?

Thanks!
The Yarland P-100 can drive the Grado GS1000 (32ohm) just fine so it should be able to drive the HD595.There are a bunch of new and improved Yarland P-100's comming in about two weeks.Don't know about Meier Corda Arietta since I never heard it.
post #42 of 204
Thread Starter 
Comparing the Yarland and the Arietta isn't really comparing apples to apples. The Arietta is a nice SS amp, great for the money, but the Yarland will provide the kind of depth of soundstage and beauty of midband only a good tube amp can muster, IMO.
post #43 of 204
Quote:
Originally Posted by perilymph View Post
Could be... it sounds like it's predominantly 60Hz, so I assumed some type of ground-related problem. But the occurrence in 3 different houses seems to indicate the cause is not upstream.
Have you tried shorting plugs on the inputs to isolate the amp from any ground-loops and stuff?

The PSU-PCB looks pretty simple and most likley the amp has AC heaters. AC heaters can run quietly IF they are set up well, and you dont have microphonic tubes. Thats a few If's with a couple ways to mess each of them up

If you have not tried other tubes I would do that. Much less expensive than a power conditioner.

I for one have a couple tubes that are "temperamental" for AC heaters (and a couple more that are just flat out intolerant). They play quietly for a good while, but once they start ringing they keep on going. very weird. tapping the case of the amp just right (the tech tap) sometimes stops them. This could explain why the amp ran quiet at someone else's place... Getting rattled just right on the trip over could shut them up. The trip back made them angry Its not the dumbest thing I have said here.

Edited: Im thinking of buying one of these, if anyone has one, LMK.
post #44 of 204
Thanks Skylab and Fairbanks. I want to by this tube amplifier soon; in Romania this cost around 250Euro and I think that's a bargain.
It's better version with Clarity Caps?
post #45 of 204
i wanted to upload some of my p100 long time ago but as i'm the laziest head-fier around but anyway here they are. mine is certainly different than you guys have.







main difference

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