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Antique Sound Lab MG Head DT / OTL MK III Headphone Amp - Page 5

post #61 of 77
On the Mark 2, it is said that only 1 of the 2 outputs can be used. One is Transformer, the other is OTL (output transformerless). On my Mark 3, both outputs work at the same time, and i have not tried cans with different impedance, so I can't help you out there. Also, on the Mark 3 the power supply is outside of the unit.
post #62 of 77
I wonder why these seem to get so little love. They seem to be available for around $400 which is well below almost anything I can think of which compares.
post #63 of 77
A 12AX7 driving an EL84 as a single-ended triode... transformer-coupled... basically what the Doge is.

The best EL84 to use is the NOS GE 6BQ5. GE 5751 is a good replacement for the 12AX7, but the Electro Harmonix 12AX7 is also good, very clean-sounding. These are based on tube-rolling in my Doge, but based on the specs, these two amps are extremely similar so my experiences should apply to both.
post #64 of 77
Quote:
Originally Posted by Blasyrkh View Post
well, let us know what you find
Well, this is waaay late, but since this thread was revived. I found the Grado was much better in transformer mode and the Senn HD600 much better in OTL mode. I had it backwards until I was enlightened by this thread
post #65 of 77
Quote:
Originally Posted by xenithon View Post
I wonder why these seem to get so little love. They seem to be available for around $400 which is well below almost anything I can think of which compares.
Ditto - these are excellent amps for their price. ASL is a great company that performs much better than it's price. I think people read about quality problems and let that turn them off possibly.
post #66 of 77
As much as I love mine, it has certain limits, and I am thus thinking of letting it go. I was wondering what the potential/suggested upgrade path is. I'd be looking for an amp which is
- tube based
- has the sweetness and body of OTL mode
- has the punch and authority of transformer mode
- has a little more definition & detail extraction

Any ideas?
post #67 of 77
Singlepower PPX3 SLAM sounds like what you need.
post #68 of 77
Have sent an enquiry about the Singlepower amps...awaiting some info. What about something like the WooAudio WA6?
post #69 of 77
I would not be quick to dismiss the ASL MkIII.

1-First, have you experimented with different tube combo's? If so what tubes? I am surprised that you matched the Senn's with the X-Can as I thought the Senn/ASL MkIII in OTL mode defined the word synergy.

2-I understand that the ASL is not the last word in micro detail. However, with the right tubes (bright and sharp) and cables in OTL I was able to pull out acceptable detail out of my Senn's.

3-You may have to spend alot more money to get a bit more detail, bass definition and dynamics. And I mean a bit.

I would follow Skylab's advice here. I would bet he has more current amp experience than many amp designers.


(quote)
- tube based
- has the sweetness and body of OTL mode
- has the punch and authority of transformer mode
- has a little more definition & detail extraction
post #70 of 77
Xenithon I assume you have replaced the stock tubes in your ASL amp? I agree with TBonner1 - the ASL amp, with Electro-Harmonix tubes, is actually really my favorite tube amp, since I can switch on the fly between normal and OTL mode, even on a song-by-song basis. I had a regular PPX3, and while it sounded good, and did some things very well, it wasn't linear enough for me, and I sold it. I have been told that the SLAM and the MPX3 are less "syrupy", but I have opted for a Blue Circle SBH (a warm but still SS amp)in place of the Singlepower. That makes the ASL my most used tube amp.
post #71 of 77
1. yup, various combos. The one I currently use and find to be the best is EL84M x 2 and NOS Raytheon 5751 black plate. I do in fact enjoy the MG Head with the Senns, more so than the X-Can (the signature will be revamped soon )
2. I still thinks it lacks details...in particular, the ability to extract textures and layers from complex / multilayered pieces.
3. point taken....diminishing returns methinks

Just to add, this is purely out of interest/intrigue....an enquiring mind . With some recent purchases and other plans in my Head-Fi roadmap, I don't think the MG Head will be replaced anytime soon.
post #72 of 77
Unlike some people, I think that detail retrival is still more the province of SS amps. I have never heard a $2k tube headamp, but all of the ones I have owned, which are all in the $400-700 range, have been easily bested by any of my Meier SS amps in terms of details. And the Meier Opera has almost all of the traditional tube amp midgrage beauty, AND the bass authority and detail retrieval of the best SS amps, which is why I love it so.
post #73 of 77
WOW, the Mk2 is down to $200 shipped? Someone please take them already!
post #74 of 77
WOW, it’s amazing how much influence tube selection has on tube amps, isn’t it? When I got my ASL MG Head OTL mk III, I listened very briefly to the stock Chinese tubes, but wasn’t too impressed, so I swapped them out for Electro-Harmonix tubes. These sounded very good, and I was pretty happy with it, so I left it that way for 6 months or so.

Then I decided to see if I could wring a little more performance out of it with some good NOS tubes, so I put in some Tesla EL84’s and a GE 5751 for the driver tube. WOW! Definitely better sounding. More sweetness in the midrange, better soundstage, smoother treble, and great tonal colors. REALLY nice stuff!
post #75 of 77
Thanks for the ASL tube rolling info, I will look for the Teslas.

I am not sure we will ever find the fine detail of solid state in any of our tube amps. I have a Single Power Square Wave coming soon and would prefer to get off the tube rolling train.
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