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Old 22nd September 2018, 10:16 PM   #11
dtaylo3 is offline dtaylo3  United States
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Spectacular! Wish I could make it. Damn. You guys in S.F. have all the fun.
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Old 23rd September 2018, 03:55 AM   #12
WBS is offline WBS  United States
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Quote:
Originally Posted by Nelson Pass View Post
...The first option is to buy some Triodes (for example low voltage 6922's) and some other parts plus the equipment to build and calibrate a single-ended gain stage with just the right amount of 2nd harmonic...
Funny you should mention that Nelson. That was originally the idea I had when I scored a stash of NOS Holland Amperex 6922 when the Mare Island nuclear submarine repair facility closed down.

Thankfully a few years ago after experiencing FirstWatt in person, I realized I no longer needed to deal with the frustration of chasing the schematics and antique equipment that would provide the sound I wanted.

I sold sold all my 6922's and made a tube diyer ecstatic. I've never looked back!

The H2 looks like a fun toy to play with. It should make lots of diyers very happy!
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Old 23rd September 2018, 04:18 AM   #13
sippy is offline sippy  United Kingdom
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The H2 looks like a fun toy to play with.
Not bath proof though....
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Old 23rd September 2018, 01:18 PM   #14
Michael Rothacher is offline Michael Rothacher  United States
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Old 23rd September 2018, 03:35 PM   #15
indra1 is offline indra1  Indonesia
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Originally Posted by sippy View Post
Not bath proof though....
Be appreciative that no explosion proof container is needed for safe operation unlike "Prior Art" H2 generator.
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Old 23rd September 2018, 06:28 PM   #16
WBS is offline WBS  United States
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You mean like this H2?
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Old 23rd September 2018, 06:36 PM   #17
Nelson Pass is offline Nelson Pass  United States
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Originally Posted by WBS View Post
The H2 looks like a fun toy to play with. It should make lots of diyers very happy!
I have one with your name on it.
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Old 23rd September 2018, 06:48 PM   #18
Blk Dynamite is offline Blk Dynamite  United States
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Are these boards ever going to the store?
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Old 23rd September 2018, 07:06 PM   #19
EUVL is offline EUVL  Europe
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Nelson,

What are the typical Idss values of those J112s you measured ?
Mine measured some 12 years ago is between 30 and 60mA.
I thought it would be a bit high to run in your published circuit ??


Patrick
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Old 23rd September 2018, 07:09 PM   #20
plasnu is offline plasnu  United States
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I personally think that this is a trick best played only once in the audio chain, so if you already have a SET amp or some other component with lots of 2nd harmonic, you want to temper your expectations when used with this also. Or maybe you want to hear what your SET sound like with the 2nd harmonic cancelled......
This is a very interesting part. I think many SET users are using SE preamp or SE driver stage, but how do they deal with H2 in their whole signal chain? Must be a black art.

Last edited by plasnu; 23rd September 2018 at 07:12 PM.
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