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Introducing Tavish Design
Introducing Tavish Design
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Old 28th May 2015, 11:28 PM   #1
TavishDad is offline TavishDad  United States
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Join Date: Aug 2014
Location: New York
Default Tavish Design Classic Vacuum Tube Phono Stage (MM / MC) Kit

Tavish Design is a small (2-person, father-son, for now) audio component business based in New York State. We make what we sell. We’ve just introduced our first product in kit form, a vacuum tube phono stage (moving magnet & moving coil) that is simple, attractive, and inexpensive, yet offers very high performance. The phono stage is available in a variety of ways; as a bare circuit board with instructions, a complete kit with enclosure, or an assembled product. The assembly and setup manual (including schematics and parts lists) is a free download, even if you don’t buy anything.

There are other products on our website, and we’ll be introducing several more kits in the near future. Please let us know if you’d like to see the kit in other forms (e.g. parts w/o enclosure, etc.), or if there are other kits you’d like to see.

I’m an electrical engineer with more than 25 years of industry experience, and I’ve also been an amateur audiophile and DIYer for more than 35 years. I hope you’ll check out our website and let us know what you think.

Of course, I’ll monitor this thread on diyaudio, but for a faster response you can always contact us at:

info@tavishdesign.com
Tavish Design
Scott

Last edited by TavishDad; 1st July 2015 at 10:48 PM.
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Old 5th June 2015, 01:12 PM   #2
TavishDad is offline TavishDad  United States
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Default Tavish Design Classic Phono Stage Assembly Manual Update

The assembly and setup manual for our Classic Phono Stage kit has had some minor updates, based on a few customer questions. All kit owners have the updated manual, but if anyone downloaded it for DIY (or curiosity), you might want to get the new version.

Best,
Scott

Classic Vacuum Tube Phono Stage (MM / MC) – Tavish Design
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Old 1st July 2015, 10:52 PM   #3
TavishDad is offline TavishDad  United States
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In response to a couple of inquiries, we’ve just made our vacuum tube phono stage kit available in an additional format, as a complete kit, but without the enclosure – for those who would like to use their own enclosure.

So, the Classic Phono Stage is now available as a bare circuit board with instructions, as complete kit with or without the enclosure, or as an assembled product.

The assembly and setup manual (including schematics, parts lists, and measurements) is a free download, even if you don’t buy anything.

The assembled product (and kits) now ship to USA & Canada. The circuit board ships anywhere (please contact us if you don’t see a shipping option for your location). We’re also considering an export version of the kits, so contact us (or respond to this forum), if that might be of interest.

Finally, the Classic Phono Stage uses the 5751, 12AX7, and 12AU7 tubes. We considering a variant that uses the popular 6SL7GT – and we’re testing current production 6SL7s to see if they have low enough noise for our product.

How much interest in a 6SL7 – based phono stage?


Classic Vacuum Tube Phono Stage (MM / MC) – Tavish Design

Scott
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Old 10th July 2015, 04:56 PM   #4
TavishDad is offline TavishDad  United States
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Default Raffle

We’d like your feedback on our products and website, and so we’re holding a raffle, as other vendors on this forum have done in the past. For the every 20 readers who post a question, constructive feedback, or suggestion for a future product on this thread, we’ll give away a free Classic Phono Stage PCB (including free postal shipping up to $10), up to 4 PCBs. The winner will be selected at random from the 20 posts. And we’ll give away at least 1 board per month, so if there is only one post in a month, that’s the winner (no posts = no winner…….).

Previous customers have been entered into their own “raffle” with even better odds (thanks!).

Classic Vacuum Tube Phono Stage (MM / MC) – Tavish Design

Scott
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Old 23rd July 2015, 07:14 PM   #5
IwanS is offline IwanS  United States
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Very interesting hybrid amplifier. I don't suppose you would post the schematics for that?

Iwan
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Old 23rd July 2015, 08:23 PM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by TavishDad View Post
For the every 20 readers who post a question, constructive feedback, or suggestion for a future product on this thread, we’ll give away a free Classic Phono Stage PCB (including free postal shipping up to $10), up to 4 PCBs.
Can you discuss the decision in your phono stage to have the 75uS after the second stage,
instead of after the first stage?
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Old 24th July 2015, 12:58 PM   #7
TavishDad is offline TavishDad  United States
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Quote:
Originally Posted by IwanS View Post
Very interesting hybrid amplifier. I don't suppose you would post the schematics for that?

Iwan

Thanks. There are lots of hybrid amps out there, but the Minotaur is one of very few on the market that are direct-coupled. But it is a complicated piece of hardware, and I don’t see any practical way to offer it as a kit.

But I have been considering a simpler, lower power, lower cost, direct-coupled hybrid that could be offered in kit form. Of course, I’d post the schematics for that. I opened a thread on diyaudio to discuss the circuit idea (which could be a power amp or headphone amp), but it didn’t get much attention.

Direct-Coupled Tube (or Tube-MOSFET) Headphone Amp Circuit

Scott
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Old 24th July 2015, 01:27 PM   #8
TavishDad is offline TavishDad  United States
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Quote:
Originally Posted by rayma View Post
Can you discuss the decision in your phono stage to have the 75uS after the second stage,
instead of after the first stage?
Thanks. That’s sort of two questions, and I’m not sure which one you are asking.

I split the RIAA EQ into two sections, instead of one as in the classic RCA circuit, because I found it easier to get consistently accurate equalization over variations in tube characteristics. For a given set of tubes, the equalization can be trimmed as accurately as your inverse RIAA network will allow. But tubes vary in their plate resistance and input impedance (variations in input impedance are less often discussed), and coming up with a set of component values that work well for all tubes is complicated. Splitting the EQ into two parts makes it simpler and gives more freedom for component value selection.

The next question is whether to put the 318us or 75us first. The 318us time constant is a shelving filter that falls at 20dB/decade from 50 to 500Hz, then attenuates signals above 500Hz by a constant 20dB. The 75us circuit is a low-pass filter that attenuates signals above 2.1kHz by 20dB/decade. So signals below 21kHz will be attenuated by less than 20dB. Therefore, putting the 318us section first gives more overload margin for signals in the audio range.

But tubes have a lot of overload margin, and I’ve seen it done successfully both ways.

Scott
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Old 24th July 2015, 03:17 PM   #9
rayma is offline rayma  United States
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Quote:
Originally Posted by TavishDad View Post
But tubes have a lot of overload margin, and I’ve seen it done successfully both ways.
How about noise in the two cases?
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Old 25th July 2015, 12:50 PM   #10
JOHNNYCR100 is offline JOHNNYCR100  Abu Dhabi
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Location: Middle East someware!
Default Good luck

Hi,

Hope your venture goes well, that's how lampizator started ..now look at him!

Go well

Johnny
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