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25W Single Ended Hammond 193V Choke Loaded 2SK180 L'Amp
25W Single Ended Hammond 193V Choke Loaded 2SK180 L'Amp
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Old 23rd February 2021, 12:04 PM   #101
analog_sa is offline analog_sa  Europe
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25W Single Ended Hammond 193V Choke Loaded 2SK180 L'Amp
Quote:
Originally Posted by fabre View Post
Is it possible to build this amplifier with THF-51S?

Certainly. But the more important question is: do you have speakers that can make use of such an amp?
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Old 23rd February 2021, 02:32 PM   #102
tubesguy is offline tubesguy  United States
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Quote:
Originally Posted by analog_sa View Post
Certainly. But the more important question is: do you have speakers that can make use of such an amp?
I don't understand how this is a reply that means anything to the person who asked the question. What is it about speakers that in your mind make them able to "make use of" this amp? Impedance, sensitivity?
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Old 23rd February 2021, 04:17 PM   #103
fabre is offline fabre
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To meet Analog sa,mes Hps Are 102 db 1w/1m
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Old 23rd February 2021, 04:30 PM   #104
fabre is offline fabre
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Good morning, gentlemen. I will ask my question again.
Is it possible to build this amplifier with THF-51S?
If yes, same idle current (2.3 A to 2.5 A) and 35 Vds?
By thanking you in advance.
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Old 23rd February 2021, 04:40 PM   #105
pinholer is offline pinholer  Canada
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Yes, it is possible. That operating point is one that does work for the THF-51S. There are variations among the THF-51S, so you may have to adjust a bit. I have amps where I run at 38V and 2.1A.
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Old 23rd February 2021, 04:48 PM   #106
Zen Mod is online now Zen Mod  Serbia
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25W Single Ended Hammond 193V Choke Loaded 2SK180 L'Amp
everything pretty much the same with THF51

finding sweet spot for your taste is strictly optional
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Old 24th February 2021, 07:03 PM   #107
flocchini is offline flocchini  United States
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I tried this circuit about 6 months ago with THF51-S but with 25VAC transformer. Never was able to get a stable bias. Maybe the higher voltage (30VAC) is the key or maybe I didn't have the patience

Best

Bob
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Old 24th February 2021, 08:04 PM   #108
analog_sa is offline analog_sa  Europe
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25W Single Ended Hammond 193V Choke Loaded 2SK180 L'Amp
Quote:
Originally Posted by fabre View Post
To meet Analog sa,mes Hps Are 102 db 1w/1m
Sensitivity is not as important as a controlled impedance. The vast majority of ordinary speakers are extremely unhappy when driven from a 5-7 ohm source.
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