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In Reply to: RE: Is that what you want? posted by jorisdallaire on February 8, 2016 at 10:23:18:
Just a further precision on what I meant by "unsuitability" through my one and only experience. I was more referring to the sound they produce since in my test there was no other disadvantadge to HFAC. I seem to recall you tried it once as input? I might be mistaken as well - Sorry about that. It's been a while since I messed with these.
However I do I recall you pointing spurious HF emissions to be watched, because that made me push the analysis on the scope more precisely focused on the input stage and overall stability. I must add that the power stage (2 stage amp) was a russian DHT tetrode trioded, also fed from an HFAC module.
The sound is almost unreal because the background just disappears - One must hear it to believe it!
When used on the input stage on breadboard, I found that *somehow* soundwise I still preferred the raw AC approach when hum is no issue as with IDHTs, but not by much.
RIAA preamp is one place where the benefits of HFAC are prominent and justify the *very light* sound trade-off wrt to direct AC, in fact it is not much to pay for silent black background, LF AC almost inevitably causing hum on the high-gain input stage of the preamp.
Just some random thoughts of the moment.
Curious to read your thoughts about the sound as well
Best regards,
Joris
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Follow Ups
- HFAC: more thoughts on unsuitability to IDHT input stages - jorisdallaire 15:43:53 02/08/16 (0)
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