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In Reply to: RE: How do SE 6V6/12V6 sonics compare with the low powered DHT/IDHT tubes? posted by Frihed89 on January 15, 2016 at 01:47:55
The 1626 was designed for use as a RF oscillator and Class C (non-linear) amplifier. It's curves aren't even close to the triode-mode 12V6. That might be the difference you hear (distortion). I have to say, as a fan of both the 12V6 and 6BQ5 for SE use, I prefer these tubes in pentode mode. The nuance and dynamics in that mode are very, very good, with the 6BQ5 maybe having a slight edge. Either tube is difficult to improve on without spending much more time and money.
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Buy Chinese. Bury freedom.
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I had the OPs adjusted to be "optimal" and can switch between them, although it is still cathode biased.
I don't know what you mean by "optimal," but a 1626 is not as linear as a 6/12V6. The distortion characteristics of these two will not be the same, regardless of how they're adjusted.
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Buy Chinese. Bury freedom.
OK, I understand. The points were originally set so that both tubes could be played with the cathode bias. A while back I posted about the possibility of switching the bias between tubes (on this or the tube DIY forum) by adding a resistor in parallel + a switch. My tech told me that he found better bias points for both tubes and changed the existing bias for the 1626 and added a new bias circuit in parallel for the 6V6.
And yes, I think the 1626 has more distortion than the 6V6.
That's the best I can do as far as an explanation is concerned.
Thank you for your reply. I wish I understood more, and that is a priority now that I am retired.
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