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What headphone amp to buy-Sennheiser HD 600?

Well, thanks to the kindness and patience of my fellow A'gon-izers, the hook-up "problem" for the headphone amp I have is solved. The amp is a Ramsey SHA 1. The phones are Sennheiser HD 600. I had remembered that amp sounding great. Now I'm spoiled by the new speakers I have, and even though the signal path to the amp is thru the Dodson DAC, I still think it sounds........not so great. Decent I suppose, but harsh on the upper end, yet without the mitigating detail, and you know, just.....unsatisfactory.

OK, OK, so here's the question(s): What's a great, fairly cheap (like, at LEAST less than a grand) headphone amp? Sonically, I want EVERYTHING!!!! (Except soundstage, that has never happened for me with any headphones, ever, I'm pretty sure not even with the expensive Stax I heard a few years ago).
It MUST have: Tight, deep, fast, smooth, tonally correct, musical bass, shimmering, non-fatiguing, emminently smooth yet ultra detailed highs, great midbass punch with no boom or softness whatsoever, midrange that is totally natural, smooth, detailed, and lacking any hint whatsoever of grain or electronic amplification artifact in the upper registers. It should sound great on ALL program material, from classical to rock to bluegrass to new age to jazz, anything and everything.

Other than those relatively modest criteria, there are no other performance demands. :)))

So, fire away!
mdhoover
mdhoover OP
695 posts
 
Richingoth, when you say this:
"Since biasing is adjusting the current in milliamps of the tubes and the user is adjusting in millivolts there has to be a precision 1Ω resistior that you are measuring across."
Does that mean that you think it might be better to spring for an expensive device, like a Fluke or something? Thanks.
-Bill
swampwalker's avatar
swampwalker
5,138 posts
 
I am going to take a chance on revealing my ignorance and say that the absolute values of the bia current is not as important as making sure that the pairs of tubes are biased identically; therefore I do not think that having a precision resistor is that important. Many folks tweak the sound of their amps by tweaking bias a bit one way or the other. Of course, anyone iwth better knowledge of circuit design (that means just about anyone) can correct me and I will gracefully bow to their superior knowledge.
richingoth
326 posts
 
Mdhoover, the Radio Shack DMM would be just fine in this application. I have never worked on an tube audio amplifier nor seen any schematics but only on guitar amplifiers and have been doing so for about 30 years. Most if not all guitar amps don't have provisions for the probes of the DMM, (i.e. not user friendly). Groove Tubes has a tube socket (with a built in 1Ω resistor with attached leads) the tube under test gets plug into this device and the device into the empty tube socket on the amp. Here is a link to that manufacture's page: http://www.groovetubes.com/product.cfm?Product_ID=1191
mdhoover OP
695 posts
 
Swampwalker* and Richingoth: Thanks guys! That information is extremely helpful. The new tubes have arrived and now just the headset is still out.
*(Swampwalker: "Ignorance" is a term that has never even crossed my mind when thinking of you. It applies quite nicely to my knowlege of tubes, however!)
-Bill
mdhoover OP
695 posts
 
Uh-oh, looks like my copy of the SRM T1 owner's manual doesn't mention tube biasing at all. #@%$&!! (It must be different than the owner's manual for the 006t that Swampwalker used to own). In an effort not to bug you guys any more, I actually did try to find a pdf of the owner's manual (in case the one I have is incomplete or something, even though it doesn't look incomplete), and did Google the question using the advanced search function. Guess what: Google sent me back here. Any SRM T1 owners out there?????? Marakanetz, are you an SRM T1 owner? Thanks again.
-Bill
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