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Author Topic: Portable amps  (Read 81423 times)

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CEE TEE

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Re: Portable amps
« Reply #420 on: January 24, 2015, 08:36:33 AM »

Bill!  I got my Leck with eventual gain of 6 below stock...I just changed phones and couldn't reply earlier.  Sorry!  Nick changed my gain twice...I tried at 0 gain and then stock 12 before going to 6 which is a sweet spot for UERM.

Hope you can get yours adjusted if you like my unit's gain.
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SoupRKnowva

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Re: Portable amps
« Reply #421 on: January 24, 2015, 08:49:32 AM »

I know all of you guys love the Leckerton, but have any of you had the chance to hear the Vorzuge Pure II? Its still the best portable I've heard, but I've never had the chance to hear the Leckerton.
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knerian

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Re: Portable amps
« Reply #422 on: January 24, 2015, 08:51:57 AM »

Bill!  I got my Leck with eventual gain of 6 below stock...I just changed phones and couldn't reply earlier.  Sorry!  Nick changed my gain twice...I tried at 0 gain and then stock 12 before going to 6 which is a sweet spot for UERM.

Hope you can get yours adjusted if you like my unit's gain.

I was with Bill when he put his Z7 in the amp, he couldn't believe how good it was coming out of that tiny little thing.  Literally 0.5 seconds for him to make the proclamation.
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Bill-p

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Re: Portable amps
« Reply #423 on: January 24, 2015, 08:54:45 AM »

@CEE TEE: Oh, no worries! I wasn't even expecting a response until tomorrow, what with all you had to go through today (still feeling apologetic even though you kept saying it's not my fault!).

Thanks! Will ask Nick to adjust gain when I place an order.

And will leave Z7 in your care next time I come by to return stuffs. I think the Leck with it is just a sublime (trans)portable setup.

@SoupRKnowva: I could... purchase a used one on H-Fi and be the guinea pig for that comparison. I'm kind of curious about it, too, and... honestly, I think all I really need is an amp right now. Hopefully resale of it won't be too bad when I end up not liking something...

Though I must say, "blackground" is one of its touted features, and I'm kind of looking for that. (and resolution)

@knerian: Yep! Haha... you saw my reaction.

I think a part of it was... I was looking for that "clarity" with the Z7 for so long, because I have modded it for so long, and that was the one thing I was always looking for. There is never enough resolution for me with the Z7, and the worst thing is that it keeps on improving, so I still have yet to see an end. I suspect the Leckerton is the end, either, but at least it does do better than all of my sources.
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Bill-p

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Re: Portable amps
« Reply #424 on: January 29, 2015, 12:07:57 AM »

Hm... so after fixing the channel imbalance, and doing some mods to the capacitors, I feel the TTVJ Portable Tube Hybrid is sounding like a smoother/fuller/slightly less detailed Leckerton UHA-6S Mk.II. Airiness, soundstage, imaging, etc... are all about the same. Noise floor be damned until I try to cover the casing with mu-metal.

But... the TTVJ truly is a phenomenon portable amo. Almost matching the transparency of the Leckerton is no small feat, and somehow... I'm enjoying it more for vocals, probably because of less "problems" that I can hear with certain recordings.

So... hmm... after that initial moment of blood rushing to my head, I think I'll hold off on finalizing the order on the Leckerton, and probably wait until either the portable Cavalli amp is released, or attempt to make my own solid state portable amp and tune it to sound like the TTVJ... (this'll be fun!)

Now I can understand why the TTVJ almost never goes up for sale.
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audiofrk

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Re: Portable amps
« Reply #425 on: January 30, 2015, 02:30:50 AM »

Hm... so after fixing the channel imbalance, and doing some mods to the capacitors, I feel the TTVJ Portable Tube Hybrid is sounding like a smoother/fuller/slightly less detailed Leckerton UHA-6S Mk.II. Airiness, soundstage, imaging, etc... are all about the same. Noise floor be damned until I try to cover the casing with mu-metal.

But... the TTVJ truly is a phenomenon portable amo. Almost matching the transparency of the Leckerton is no small feat, and somehow... I'm enjoying it more for vocals, probably because of less "problems" that I can hear with certain recordings.

So... hmm... after that initial moment of blood rushing to my head, I think I'll hold off on finalizing the order on the Leckerton, and probably wait until either the portable Cavalli amp is released, or attempt to make my own solid state portable amp and tune it to sound like the TTVJ... (this'll be fun!)

Now I can understand why the TTVJ almost never goes up for sale.

what kind of mods did you do, any pictures?
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Bill-p

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Re: Portable amps
« Reply #426 on: January 30, 2015, 06:30:57 AM »

what kind of mods did you do, any pictures?

I soldered high frequency ceramic caps (1pF value) in parallel to the metallized polypropylene caps in the signal paths (left and right channels) in order to color the sound a little bit. <- it's a tube amp so I can do whatever the heck I want, right?

The end result is actually kinda surprising, but I "half-expected" that given that this article:
http://diyaudioprojects.com/mirror/members.aol.com/sbench102/caps.html

...gave me an idea of what would happen when two caps that are underperforming are suddenly coupled in parallel, and then they measure differently.

It gives a slightly cleaner sound, so now the TTVJ amp is just a hair away from the analytical sound of the Leckerton, but I think I'd prefer the smoothness of the tube amp 100%. If only there was any way to eliminate the ringing when I plug the cable in (that's the only time it rings), and to shield the tubes and the buffer op amps away from GSM signal, I think it'd be perfect.

Anyway, if you're interested in knowing which capacitors I coupled the ceramic caps to, I can take some photos by this weekend. I think I'll also take a photo of the fix for the channel imbalance issue (just a voltage divider built using resistors off of RadioShack) for future reference...
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audiofrk

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Re: Portable amps
« Reply #427 on: February 03, 2015, 03:38:17 AM »

I soldered high frequency ceramic caps (1pF value) in parallel to the metallized polypropylene caps in the signal paths (left and right channels) in order to color the sound a little bit. <- it's a tube amp so I can do whatever the heck I want, right?

The end result is actually kinda surprising, but I "half-expected" that given that this article:
http://diyaudioprojects.com/mirror/members.aol.com/sbench102/caps.html

...gave me an idea of what would happen when two caps that are underperforming are suddenly coupled in parallel, and then they measure differently.

It gives a slightly cleaner sound, so now the TTVJ amp is just a hair away from the analytical sound of the Leckerton, but I think I'd prefer the smoothness of the tube amp 100%. If only there was any way to eliminate the ringing when I plug the cable in (that's the only time it rings), and to shield the tubes and the buffer op amps away from GSM signal, I think it'd be perfect.

Anyway, if you're interested in knowing which capacitors I coupled the ceramic caps to, I can take some photos by this weekend. I think I'll also take a photo of the fix for the channel imbalance issue (just a voltage divider built using resistors off of RadioShack) for future reference...

interesting if you could take a pic that would be great.

oh and thanks for the great read, a little above my head but informative none the less.
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Bill-p

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Re: Portable amps
« Reply #428 on: February 11, 2015, 11:10:52 PM »

Sorry for the late response. But here are some photos:

Voltage-divider to take care of the channel imbalance: (would have tried a pot if it could fit, but I couldn't find a pot that small)


Capacitors (orange thingies) for tuning the sound. They are 1pF ceramic caps. Bad in the signal path, I know, but this is a tube amp, which already colors the sound, so...
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CEE TEE

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Re: Portable amps
« Reply #429 on: February 11, 2015, 11:34:19 PM »

Nick Kettman approved me to share about the new Leckerton amp-only versions coming out:

"My new amp-only design has some similarities to the UHA-6S.MKII but also includes some improvements. I don't want to release too many details just yet because I still have some major compliance tests to pass. I don't want to set anyone's expectations in case I need to change something in the design. But so far things are looking good. I just wish I could make the process go quicker! :) "
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