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In Reply to: RE: My Xmas project - From KT120 to DHT posted by fiacono@optusnet.com.au on January 15, 2015 at 21:33:34
Nice project Frank, and (in my opinion) a really good choice of tubes if that's enough power for your listening needs! It was obviously a nearly complete overhaul of the wiring and much of the mechanical. Not a task for the timid!
Yes, 6N30P tubes are a job to tame down, although it's much easier without the cascoding. We spent much time determining the plate voltage and current and ancillary parts needed to get the balance right. I still would like a less dry sound than these give, but haven't been able to get there without compensating for it somewhere else.
Kevin Carter
K&K Audio
www.kandkaudio.com
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Those EML 2A3 mesh plates required a good home, been lying around the house for quite a number of years, original purchased for drivers. Using CCS with IDHT as drives made little difference. Power output level satisfies the wife. Now she wants one for the TV, I’m thinking of a smaller version all IDHT, it’s just for watching movies – any ideas?
Be placing an order soon for more amorphous core transformers (before the US dollar gets too high against the Aussie), amorphous core makes a big difference.
Frank
I've found that the early production 6h30P-DR sound notably less aggressive than current production, just more balanced all round.
However an essentially direct equivalent in virtually all cases, which sound significantly more liquid & mellow are the Russian 6N6P, although they tend to have a much higher rate of mismatching triodes, so screening is required if relevant to the application.
Then again they're so cheap that it's no drama to buy a dozen and pick the best !
The 6N6P is indeed more mellow sounding. However, it's a good thing that they are cheap, too, as they last a fraction of the time that the newer 6N30P lasts!
The pre-Sovtek 6N30Ps are less "sharp", but frequently become significantly microphonic early in their audio careers. They've also become dauntingly expensive in recent years.
Where is that perfectly voiced input triode with low plate impedance, moderate gain, and availability at less than USD10? (yes, they exist only in my and, perhaps, your imagination) ;+))
Kevin Carter
K&K Audio
www.kandkaudio.com
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