F4 power amplifier

[Manu]

Oh yes they are nice.

But
500V. For F4?

(I guess much more Pooftubes?)

these ones are for grown-ups

There is no urge for me to become an adult

Manu

 

[Zen Mod]

Oh yes they are nice.

But
500V. For F4?

(I guess much more Pooftubes?)



...

Manu

naah ....... these are for SET for grown ups

two of them in series - SET for serious grown ups ;

 

[Magura]

naah ....... they're for sissies

these ones are for grown-ups

Yeah right, you just go play with your pooftah hollow state stuff, and leave the real cool amps for us....


Magura

 

[jacco vermeulen]

make PSU?

Not yet, i need cases first and regular size cases will not do, for "number" take a pick between 1 and 1000.
I have these, the one on the picture is a 25uF sample, only one i have with a price tag. (1997 production)

Good, but '83 may be as stale as Zenny.

 

[Manu]

Why especially motor start caps (same as in washmachines)?
Are they good for audio?
Manu

Pick a take between 1000 and 1

600?

 

[jacco vermeulen]

Metallised Polypropylene foil, here
Close.

 

[Manu]

say 800 and c'est la rue Michel (same as "Bob is your uncle")

If they are 30uF you need a lot for PSU.


Manu

 

[jacco vermeulen]

Manu Ciao should make some dough in the casino.

A 19"x15"x4" (W/D/H) case can hold just about 80 caps, minor engineering problemo.

 

[luvdunhill]

naah ....... they're for sissies

these ones are for grown-ups

I want to be a grown-up, but I'm not sure I can handle it. Before I flip the switch, I'll e-mail an adopted DIY grown-up or two (besides Magura).

 

[Zen Mod]

Why especially motor start caps (same as in washmachines)?
Are they good for audio?
Manu




600?

never use motor start caps ;
they're in use (in original ) under 1/2 sec , every time motor starts ;

that tells you something ?

you want plain motor run caps .....

tip : you can count on fact that on every start cap "start" is clearly written

 

[Manu]

that tells you something ?

For myself, I usually don't need Starthilfe ... thanks


Thanks for hints.

 

[Variac]

Even John Curl called them Motor Start caps in his thread, , but even he MEANT Motor RUN caps. Motor run caps are polyprop in oil- yummy!

 

[jacco vermeulen]

My bad, a motor start cap is an electrolytic, motor run is polyprop foil.
I tried the motor runnners on the P1.7, not all that bad really.

(If it turns into a sour treat, at least i can repair each of the washers and dryers 200 times, should easily last me to the next millenium in my nuke bunker)

 

[Manu]

Imagine a PSU which only last a 1/2 second.
Even for minimalistic Music, its too short...

 

[jacco vermeulen]

You could make a CD like that and call yourself 50 PerCent

 

[Manu]

Mister "9 1/2 seconds" ... much better.

 

[Zen Mod]

Even John Curl called them Motor Start caps in his thread, , but even he MEANT Motor RUN caps. Motor run caps are polyprop in oil- yummy!

who is John Curl ?

 

[Magura]

Even John Curl called them Motor Start caps in his thread, , but even he MEANT Motor RUN caps. Motor run caps are polyprop in oil- yummy!

Motor run caps are plain metalized PP caps, but mostly better quality that the so-called audio caps.

Comar makes some of the best, and they happen to be cheap as well.

Magura

 

[bubba177]

has anyone had a hum problem with the F4? i have a 2 inch ground bussbar with signal ground on one end and speaker and power supply grounds attached on the other end with the thermistor at that end going to chassis ground with power earth ground at that point on the chassis also.----i have tried grounding the rca grounds together and tried bypassing the thermistor but none of that makes a difference. my rectifier diodes are mounted a couple of inches from the output pcb --is this to close? maybe some stray ac? hum is the same in both channels and doesn't vary with all the pushing and prodding i do. please give me some advice -mark

 

[Nelson Pass]

Maybe you want to put all the power supply grounds on one end
and all the signal bearing grounds on the other end (including
the speaker returns) At this quiet end a power thermistor to the
chassis which is directly attached to AC outlet ground.