The Singing Bush Tips 'n' Tricks

2up, 2down

prescribed Iq 20mA, divided by 2, so each getting 10mA

strong BL would do

latest Papa's Lecture sez that, say, 8mA Idss is OK

Beyond the J Fringe

I prefer that you bias them to sum 20mA than that you bias them to Idss if it's lower


didn't I read what Pa said, I would advise latter

Thanks! And glad I checked - I would’ve been aiming for around 14ma otherwise. I have an abundance of 10+Ma K170’s, so this ought to work out nice
 
just for my friend Rick

🙂
 

Attachments

  • red wax seal.jpg
    red wax seal.jpg
    101.9 KB · Views: 170
Rick DID NOT listen to four channels of SINGING BUSH.

I think he destroyed the mosfet but ZM thinks there is a chance it is still alive. That something else is the problem. Always a puzzle to solve.

I can tell you that listening to three SINGING BUSH and one SIT 1 is not half bad ...

I could live with it.
 
I feel like I should know the symbolism of ZM's gift but I cannot place it.

He is going to have to tell me.

If it has to do with seasons 4 and beyond that would explain my ignorance, My first assumption is a reference to ... of fools and horses - which ZM told me to watch and I have been obsessing on it since.
 
there is saying...... or, more precisely - approach to life, of afficionados of one special Comic series, named Alan Ford

Incidentally, known well in Italy (where it is made), but simply adored in former Yu; plenty of reasons ........ one of them being absolutely Genial translation by late Genius Nenad Brixy(who knows anything about process, knows how that is important and tricky to get right or even more than right)

Fans of same are saying that all necessary wisdom for life can be found in that Comic.... and it is indeed

same approach can be used with any of your personal fixation ...... and I have many

OFAH, Northern Exposure, Black Adder, Alo Alo..... are just some of TV shows I enjoyed immensely

though in last year and more, only screens I'm starring at are PC screen and Kobo screen

CRO screen doesn't count
 

Attachments

  • Grunf Ita.jpg
    Grunf Ita.jpg
    32.5 KB · Views: 148
I am thinking of the comment your Pa made in that lecture about how he thought most of the readers of the forum were more interested in metalworking than amplifier soldering.

He could never say that about me. I can barely drill two holes on the same plane.

My amps will remain easy to disassemble in case something more interesting comes up - or an interesting modification. Not to mention I think amplifiers sound better when not encased in a metal box.

Metal boxes are made for ease of shipping and in the case of hyper audio boxes very questionable design decisions - some of those things are so hideously ugly along with being, by far, the most expensive part of the amplifier.

I continue to think the early MARK LEVINSON stuff was about as close to RIGHT as any fancy box but my heart really resides in the Bill Z. Johnson aesthetic. The AUDIO RESEARCH gear of my youth looked like THIS IS ALL YOU NEED - solid, sturdy and to the point.

So after I get all four to be the same - well almost the same - the low frequency amps will be using 400 VA transformers - then I will leave them alone. My simple "enclosure" is plenty sturdy when sitting on the stand but there is no way I could ship them and since I have no need to do that ...

Wanted to work with NUMBER 4 last night but had managed to lose my last 2.5 A fuse - I have some coming from MOUSER today.

Also, by the way I have found the extra expense for a LITTELFUSE is justified. They are superior fuses. In my experience a SCHURTER fuse's only use is if you want something to fill your fuse holder for decorative purposes.

I wonder if sealing wax is a good dampening substance for PCBs?

ZM, you never opined on my idea of using one-half of an 800 VA 50 volts power transformer to get a more substantial core.
 
......

I wonder if sealing wax is a good dampening substance for PCBs?

ZM, you never opined on my idea of using one-half of an 800 VA 50 volts power transformer to get a more substantial core.

luckily, at least some of us moved from ML, and even from CJ designs

don't want to go about ML ( someone would do Monster! action on me) but CJ - building some and analyzing others, let's just say - leave them in past where they belong

on par with ML cringe is modern McI with green LEDs below toobs; my Mioljub N. probably even stopped rolling in grave, what's enough - it's enough

anyway- wax whatever you want, just not parts emanating heat

regarding "one half of 800VA...", probably didn't spot that one
care to repeat/clarify question?
 
Isn't there at least one benefit of a metal chassis -- RF isolation? Acting as a faraday cage should remove some unwanted interference.

Maybe the inverse is also true -- amps sound more "boxed in" when boxed in. 🙂

P.S. - speaking of chassis design, these Pioneer Exclusives were my project last year (servicing). My wife and I both love this aesthetic and craftsmanship. She told me if I ever feel like selling it, she'll buy it off me lol.

This was built decades before I was even born -- I just find most of the modern designs boring and uninspiring... Maybe it's just a case of "what's old is new again"
 

Attachments

  • PXL_20210908_020144130.jpg
    PXL_20210908_020144130.jpg
    742.9 KB · Views: 135
Last edited:
I am not speaking of anything more than the look of those components. William Z Johnson was the AUDIO RESEARCH guy - not CONRAD JOHNSON. I never cared for what they did at all. I liked ARC no nonsense look of the seventies but those days have long passed. Same with LEVINSON - when Levinson left the company he took his taste with him.

I think the most offensive of the offensive boxes has to be those from ZESTO. I figure those boxes would look right at home in a room of furniture covered in clear vinyl to protect a suitably ugly fabric.

The wax was my attempt at a joke.

My thought, which was inspired by your having power transformers made for you using a larger core. I figure using a 50 volts 800 VA ANTEK and only using one half of it would give one a far more substantial core at a minimal price increase.
 
my typo, I was also thinking about AR

xformer - no free lunch

sole way to get more turns per volt from already made xformer , thus less magnetic flux in core is to use 230Vac primary in 115Vac area, everything beiing halved - secondary voltage but also resulting VA of xformer
 
I do not live in a city but a very busy suburb (which was countryside when I moved here forty years ago) but I can see a cell phone tower from my listening room.

I do not use shielding on any cable except for the tone arm and the system is quiet. If there is noise I cannot hear it.

Maybe if one lives in Manhattan there is a real need for a metal box.

I do think, and i am not alone, that the box does something to the sound not for the good.

In my case, the biggest motivator is lack of ability to work with metal and the most important one for a fellow of Scots heritage - cheapness. None dare call it thrift - I am cheap!
 
my typo, I was also thinking about AR

xformer - no free lunch

sole way to get more turns per volt from already made xformer , thus less magnetic flux in core is to use 230Vac primary in 115Vac area, everything beiing halved - secondary voltage but also resulting VA of xformer

I thought I had read that that had its own set of problems, too.

I guess one of the advantages of living in eastern Europe is being able to use the resources of the many extraordinary specialty suppliers you have.

So you are saying that if one wired the primaries and secondaries of the 800 VA transformer in series you would have something worthwhile?
 
Since I had the concern that there is something wrong with the 400 VA 25 + 25 volts ANTEK transformer installed in ol' Buzzy and being "inspired" by your comment I ordered an 800 VA 50 + 50 volts transformer from ANTEK that I was going to use only one-half.

Now that you have suggested wiring both sides in series that is what I plan to do.

I guess one interesting twist with that is using the thermistor between the primaries or would you stick with them on the input? Funny how one question leads to more questions ...

Have I told you what you wanted to know?
 
NTC then one primary then second primary, that's the same as one primary then NTC then second primary
:rofl:
I can write permutation as long I can endure ..... but you got my drift - as long they're in series, exact lineup isn't important at all

so, if you connect two 115Vac primaries in series in your neck of wood, and connect two 50Vac secondaries in series, you'll end up with 400VA Donut, 50Vac at secondary side, with half burden on core itself - pretty much expensive way of having Audio-grade Donut........ but as I said - wtheck, if you have it - use it as you want