Review: Tube Audio Design TAD-60 Tube amp


Category: Amplifiers

I'll start by saying that I've been into higher-end audio for a few decades now, and quite a lot of equipment has been through my hands to this point (half the fun of this hobby). Somewhere around 12 years ago, I'd come to realize that I preferred tube amplification over solid state in terms of an overall involving presentation of the music, and ever since then have owned tube stuff (brief flirtations with various solid state devices only helped to enforce this notion).

Which brings me to the discovery of Tube Audio Design, the provider of components conceived by Paul Grzybek (of Bizzy Bee Audio fame), built to his specifications by a very reputable Chinese manufacturer, and then hand-finished by Paul in his shop located in Wheaton, IL. (His offerings are available exclusively online; detailed product info is found at http://www.angelfire.com/biz/bizzyb/index.html)

The TAD-60 amplifier is built like the proverbial tank; overall appearance and heft (not to mention its specifications) in my experience indeed belie the modest asking price. With its stainless steel chassis and almost 1/2"-thick black anodized face, the relatively compact package portrays a masculine but elegant stance (also included is a lift-off stainless steel tube cage). All function controls are easily accessible from the chassis top, as are the tube bias test-points and adjustment pots (a digital voltmeter is included too).

EL34-based, the TAD-60 is rated at 60wpc in UL-mode, and 30wpc in switchable-on-the-fly triode-mode. Other standard features include adjustable input sensitivity and adjustable global feedback, adding flexibility to a host of possible preamp and speaker combinations (the input sensitivity control may also be used as a volume pot in a single-source direct input configuration).

Listening to the TAD-60 after the recommended 30 hour break-in period and beyond, the music really began to open up, and along with the TAD-150 preamp, I was experiencing just about every CD I spun in a whole new manner - I'm particular to small-ensemble jazz and female vocals - there was an in-the-room conveyence of the music that I found startling at times - present is deep, tight bass, a glorious midrange, detail, depth, and an overall natural presentation that allows hour after hour of enjoyable listening. I've found that the feedback adjustment permits a fine-tuning of balance between dynamics and warmth, and was able to "lock in" the amp to my speakers for what sounds to be a perfect sonic match (just a tad of feedback along with the triode-mode setting seems to be the magic spot in my case).

Without attempting to describe every sonic attribute I'm hearing (though I'm happy to answer any particular inquiries), suffice it to say that the TAD-60/TAD-150 combination strikes a synergy and glow that is especially musical, and is among the finest I've had the pleasure of owning. The TAD-150 has already been highly praised in at least a few user and online reviews, and I bet the TAD-60 will soon be recognized as a similar standout. If you happen to be in the market for high quality, reasonably priced, excellent-sounding gear, just take a listen for yourself, and you will hear what these components can do for music. (Paul also offers a 15-day in-home trail period.)

Note: I have no financial interest or business relationship with Paul Grzybek or Tube Audio Design.

Associated gear
Magnepan 1.6QR, California Audio Labs CL-10, Music Hall MMF-5/Goldring G1012

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ggeers222
I have been using my TAD-60 since 5/2006. Last year I changed speakers and the T-60 has been religated to biamp duty firing the upper half(Mids and Ribbon tweeter) of my rebuilt Magnepan IIIa's. The amp has no problem driving this low ohm load to high levels.
I lost an output tube this moring(they were JJ KT77). They were four years old, so I have nothing to complain about.
I have the original power tubes that Paul supplied but they are in an Dyna ST70 being used in another systemand I can put them back it the T-60 temporarily. So I am in the market for new Power tubes. Just curious if any one wants to point me in a good direction.
after much reading and advice from many I deciced on Ruby KT88's from Doug's Tubes. When tubes arrived I could not bias them correctly (they were running way to hot, even with the trim pots at the minium) With help and mch patience from Paul, I added a resistor to the bias circuit and now the bias properly with ease.
The new tubes sound very different from the JJ KT77's. The extension in to the high end is a welcome surprise.
I've always wondered how the KT88's would sound, as I've seen them in MC275's, so I assume they must be kinda "special." My SED 6550C's kick ass, but don't have the quality mids and highs of an EL34 IMO, only by a slim margin, though.

What are your impressions? And why the trouble biasing? I thought they would be interchangeable with the others; KT77, 6CA7, 6550, EL34, etc. I realize no 6l6 series because Paul told me they couldn't handle current.

I've had my TAD60 since 3-2007 it currently runs a second system in UL Mode with some very nice early KLH Six's. I use it more than my "primary" SET system. I am still completely in love this amp. Too bad more can't enjoy these wonderful gems, that's for sure.
I understand Paul has passed away and his web site is defunct. Do any TAD-60 owners have copies of the information that was on there? In particular the biasing values for various tubes, and ways to tinker with them such as lowering bias to effectively get SET amplification, and other instructions/advice. Would also love to know what else was on there.