Kleinulator Mods = Closer to compressed D-lator sound??

[Structo]

I thought the loops that used the JFETS can handle a supply much higher thus preventing any clipping?

For example Metro sells a SS loop with JFETS and the designer says his loop will not clip because it is being supplied with much higher voltage.

[markusw]

I thought the loops that used the JFETS can handle a supply much higher thus preventing any clipping?

For example Metro sells a SS loop with JFETS and the designer says his loop will not clip because it is being supplied with much higher voltage.

I thought that they use MOSFETs...because I couldn't find any JFETs that would handle supply voltages higher than 100V.....
I may be totally wrong though...

[bluesfendermanblues]

I thought the loops that used the JFETS can handle a supply much higher thus preventing any clipping?

For example Metro sells a SS loop with JFETS and the designer says his loop will not clip because it is being supplied with much higher voltage.

I thought that they use MOSFETs...because I couldn't find any JFETs that would handle supply voltages higher than 100V.....
I may be totally wrong though...

You don't need 100v supply. 30-36v will do just fine, allowing a voltage swing similar to a 12ax7 in a dumblator.

[Structo]

I thought the loops that used the JFETS can handle a supply much higher thus preventing any clipping?

For example Metro sells a SS loop with JFETS and the designer says his loop will not clip because it is being supplied with much higher voltage.

I thought that they use MOSFETs...because I couldn't find any JFETs that would handle supply voltages higher than 100V.....
I may be totally wrong though...

You may be correct.
I may have the MOS and J backwards but I thought I read at Metro that Steve's loop used JFETS.

He states that you want 300v +- 10v for the B+ to the loop.

[markusw]

You don't need 100v supply. 30-36v will do just fine, allowing a voltage swing similar to a 12ax7 in a dumblator.

That's what I assume too.
I was just searching for a JFET that would stand a higher supply voltages when I read about the metro loop.

You may be correct.
I may have the MOS and J backwards but I thought I read at Metro that Steve's loop used JFETS.

I'm not sure about the MOSFETs either. Usually there are diodes added for protection of the MOSFET. I could'nt see any on the Metro loop board images. On the other hand it might be that the MOSFETs have internal protection diodes....

[Structo]

Yes they are pretty tight lipped about what is actually on the board.
And at $90 they probably need to be....

[Deric]

There are 2 zeners on the board.

[Structo]

Yes there was some talk about that.
I understand keeping some secrets if you are making money on something.

I'd just like to be able to assemble one myself and save $60.

[bluesfendermanblues]

Just scrolled through the Metro loop manual, it looks like ordinary 'small' FETs to me....j201, BF245a etc.

So I guess they just employ large ohm resistors to get the supply voltage down in the proper range for the FETS. Nothing really special IMO

[markusw]

Just scrolled through the Metro loop manual, it looks like ordinary 'small' FETs to me....j201, BF245a etc.

So I guess they just employ large ohm resistors to get the supply voltage down in the proper range for the FETS. Nothing really special IMO

FWIW, there are MOSFETs in small TO92 packages with pretty high Vds (e.g. the 2SK2998 has a Vds max of 500V). Just a guess......
BTW, the 2SK2998 even has an internal protection diode from G to S.

[markusw]

There are 2 zeners on the board.

Thanks!
I forgot about them because I thought they were wired rail to rail to limit the input signal. Of course it might be that they are wired in series as a "classical" MOSFET protection diode.....

[bluesfendermanblues]

Just scrolled through the Metro loop manual, it looks like ordinary 'small' FETs to me....j201, BF245a etc.

So I guess they just employ large ohm resistors to get the supply voltage down in the proper range for the FETS. Nothing really special IMO

FWIW, there are MOSFETs in small TO92 packages with pretty high Vds (e.g. the 2SK2998 has a Vds max of 500V). Just a guess......
BTW, the 2SK2998 even has an internal protection diode from G to S.

Ok, I didn't know that.

However, if I was to build a loop into my amp, I would go for an ordinary tube based dumblator.
The only reason I've messed with the Klein, was to have an easy DIY stand alone unit. I would never bulid that into my amp.