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The Singing Bush
The Singing Bush
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Old 13th February 2020, 04:33 PM   #131
Zen Mod is offline Zen Mod  Serbia
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well, I think we can manage with 1uF perfectly

considering Rin of 100K , even 470nF is plethora
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Old 13th February 2020, 04:55 PM   #132
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Best is play Frank Z music and try big or tiny input cap in vivo.
My plethora is 15 uF MKP with " full body muscular " sound stage.
22 uF oil cap's was a bit too much
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Old 13th February 2020, 07:44 PM   #133
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We can hear the audio difference between 470nF and 1uF
funny video effects from coupling capacitors in audio circuits
the next is for scientific minds How to select input capacitor value and type for audio amplifier projects
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Old 13th February 2020, 11:47 PM   #134
ggetzoff is offline ggetzoff  United States
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Originally Posted by Zen Mod View Post
Well , we all know funny Laws of Life .......... to achieve Plethora of Pinjatas , one must find The Singing Bush , and fathom real role, place and importance of said Phenomena in search for Greater Pastures



so , let's refresh a memory ........ The Singing Bush

as you probably know , I was on Pilgrimage (end of last year) to Sea Ranch .... to have few walks by the Open Ocean , collect some wood flown to shore ..... and to remind Pa that life isn't serious thing at all

who sez that patience and good eye are not things good to have ?

good eye spotted that Pa is not having a Loo in ( or by) his workshop;

patience is needed to catch a moment when Pa must go to Loo ( in da House) , while forgetting to shoot me outa Workshop and lock ..........

so - result is - I came back home with pair of 2SK77B Tokins , being so damn lucky that Pa didn't count them in da Shoe-box , prior to packing me in Variac's car .... ( he drove me to Snoopy Airport)

anyway , what to do with just a pair of them ...... I can't make just one Digital Domain channel ...... still using stereo in my systems ; have no money left for another Pilgrimage so fast and , besides , Pa would say "we are not home!!" even without counting what's left of Tokins in shoe-box...

so , must be some SE ........

luckily , eye and patience again - I recollect watching funny vid , Pa's Lecture at BAF 2015 , where he presented ZM's 50W SE Amp , and also Peasant (rest of Greedy Boyz) iteration , where he cheated , forcing one vulgar mos puck to behave SIT-like ,, with help of some Schade feedback , obtained with nice input xformer

coincidentally - we recently had some fun in 2sk77b

I already posted some pics and back'o'napkin sketches there , but here we go again , posting everything here , to have it complete in one place

to start with , for your amusement , picture of Alcatraz Federal Penitentiary

edit on 13.02.2020: I forgot that all Pa's BAF 2105 Lecture slides, due M. Rothacher's nicety , are available here for download (besides some other interesting things from Mr. MR) :

Articles | AudioMaker
Choky,

whoz da't guy next to papa who speaks Zemgrish.....


I want to build this amp.....I will be up for some boards.

Cheers,

Greg
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Old 14th February 2020, 12:43 AM   #135
ggetzoff is offline ggetzoff  United States
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see , ZM's 50W SE Amp , as Papa kindly constructed it ......

it's clever to watch entire vid I linked in previous post ....... you can learn few things , especially about heat
Baldric "I have a cunning plan......''
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Old 14th February 2020, 05:23 AM   #136
Zen Mod is offline Zen Mod  Serbia
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Old 14th February 2020, 05:09 PM   #137
ggetzoff is offline ggetzoff  United States
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I literally ran into this actor in London while he was filming a tv series. I wanted to blurt out a Bladricism....but I left him alone...
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Old 15th February 2020, 10:39 AM   #138
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....

Perhaps the sound is also smoother at lower volume.

.....
so, Ben , did you had some more play time ?
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Old 15th February 2020, 04:18 PM   #139
Ben Mah is online now Ben Mah  Canada
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Hi Zen Mod,

The revised operating point is definitely a winner. As I mentioned previously, the lower distortion at higher output is definitely noticeable and appreciated.

As for at lower listening level, I really can't say whether I can tell any difference. My memory is not that good. All I can say is that I was quite happy with the sound at lower levels before the change. So perhaps with the initial setup the H2 at lower levels was not high enough to be objectionable.

Ben
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Old 15th February 2020, 04:26 PM   #140
Zen Mod is offline Zen Mod  Serbia
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so , you being practically first being able of making any proper comparisons ..... what are main gains and is there any drawbacks , vs. "regular" FW format amps (those- meaning both lower power and lower dissipation .....and lower THD) ?

I can't comment , hardly being even close to be objective ........ and - didn't had a moment of stereo operation ; did put some tunes with THF51 iteration , but only mono and - my speakers are really too easy ....

resorting to Papa's tricks - connecting adequate load in parallel to speaker , so demands to amp being properly increased ..... one needs to get used to any new procedure , so no go for now
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