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In Reply to: RE: Hitachi 6SN7GTB question: Top getter vs bottom getter tube posted by waterfall on May 14, 2017 at 12:55:45
You may be right about keeping quite about Japanese tubes. There is still a good amount of "snob" bias out there from many I'm sure have not even given them a try.
The tube you posted is not the same tube as the Hitachi's I have. My pair is already in my headphone amp, or I would take a close-up. So I copied two photos from the web that shows the construction and are posted above.
I spent a good amount of time checking EVERY detail of the internals of the Tel-Rad labeled ones I purchased. Also, the print on the base (6SN7-GTB) has a distinctive print style of letters and numbers, and the Tel-Rad and Hitachi are a match there also.
Who is making a 6SN7 headphone amp?
I have a Woo Audio WA6 which I purchased new in 2012. It came with two 6DE7s and a 274 rectifier. However, it can use a pair of 6SN7's with socket adapters ( available from Wood Audio ) which I purchased two of at the same time, as I intended to use the 6SN7 from the get-go. I prefer the 6SN7 over the 6DE7, not to mention there are way more 6SN7 tube options vs the 6DE7. I also use a 1961 vintage Mullard GZ34 for the rectifier position. I love this tube amp and it drives both my Dennon AH-D7000 and Sennheiser HD600 phones very well.
Some other 6SN7 headphone amp makers I know of ( past and present ):
1. Darkvoice 336i ( discontinued )
2. Darkvoice 336SE ( Currrent model )
3. Single Power PPX3 ( discontinued )
4. Dragon Inspire IHA-1 ( Current model , but not cheap @ around $1600 )
I have heard both the Darkvoice units, which are decent sounding enough, but I prefer the Woo Audio WA6. For what it's worth, a new version of the Woo Audio WA6 came out this year and no longer supports 6SN7's from what I understand.
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