FAOW

[Zen Mod]

I like it. I just happen to have a pair of 3.5K ohm OPT's. Close enough with a slight amount of power loss?

yup , lesser power , but also lesser THD

 

[EUVL]

> I'll try your suggestion next weekend, junk box permitting

You already have Tx, D & C.
No reason why you cannot use the same MOSFET.
Else the old IRFP240 will also do.
CRD can be just a LND150, plus a 2W resistor to suit Idss and desired voltage.
And then use your other remaining C to parallel the R above.
I am sure you have them all lying around.




Patrick

 

[juanitox]

I couldn't resist joining in the fun.

FAOW Variation #2

i like it , even a french guy can build it
i already have 1,5W E55L tube Spud amp , with nearly the same config 140V 55ma 3,5K transformer. it will be fun to make a direct contest Tube Vs Sand

 

[wdecho]

yup , lesser power , but also lesser THD

Just as in a tube amplifier. You and I have horns so the slight loss of power will probably not be noticed. So simple I may have to give it a go.

 

[wdecho]

i it will be fun to make a direct contest Tube Vs Sand

My experience is all things equal with class A there is not a appreciable difference. It comes down to your preference for SS vs tubes.

 

[Zen Mod]

i like it , even a french guy can build it
i already have 1,5W E55L tube Spud amp , with nearly the same config 140V 55ma 3,5K transformer. it will be fun to make a direct contest Tube Vs Sand

also difference between triode ( I suppose you have) and pentode

Just as in a tube amplifier. You and I have horns so the slight loss of power will probably not be noticed. So simple I may have to give it a go.

power is overrated

 

[juanitox]

ZM are you Ok ? normally i would expect a " Triode are for sissies"

 

[Nelson Pass]

I couldn't resist joining in the fun.

FAOW Variation #2

Irresistible.

 

[EUVL]

Just for fun.

And no, I am not joining with the build.
Not transformers.




Patrick

.

 

[wdecho]

Just for fun.

And no, I am not joining with the build.
Not transformers.




Patrick

.

McIntosh is a firm believer in OPT for SS. Unless things have changed.

 

[Michael Rothacher]

Just for fun.

Very nice. Thank you, Patrick.

 

[Zen Mod]

McIntosh is a firm believer in OPT for SS. Unless things have changed.

you mean - autoformers ?

 

[EUVL]

A small error in the spice file but no one spotted.


Patrick

.

 

[wdecho]

you mean - autoformers ?

Don't believe so. My understanding is they use output transformers just as they do with their tube amplifiers.

 

[Zen Mod]

nope , autoformers

 

[DougL]

Too Cool.

Of course my next thought was how could I make it better. LOL

Red LED?

 

[wdecho]

nope , autoformers

I knew if I was wrong someone would correct me. Always thought they used output transformers. Zen Mod is the man.

 

[Michael Rothacher]

Red LED?

Do you mean for the bias?

In this case, you want the degeneration and adjust-ability.

 

[Zen Mod]

I knew if I was wrong someone would correct me. Always thought they used output transformers. Zen Mod is the man.

if that's for believing , all you need is to take a look at their xformers , top.

power xformer having proper schematic sticker , autoformer also ..... even wearing a title Audio Autoformer

example attached (clogging da thread ...... but this is Papafun one , so who cares) .... and yes , overcomplicated drek .

just rename xtension from .asc to .pdf ..... I cheated , to upload it here

 

[cochleus]

My interests lately have been x-former left or right to get triode curves. Low part count discreet SE Class A ~1w (desktop amp). I was looking at Shade-enabled or a "mini MoFo". Thread came at a good time for me.